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The solar system collapsed from a massive cloud of gas and dust to form a n

Formation Our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a solar nebula—a spinning, swirling disk of material Approximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula. Gravity collapsed the material in on itself as it began to spin, forming the sun in the.. A cloud of gas and dust collapsed into a flattened disk, within which the Sun and planets formed

In Depth Our Solar System - NASA Solar System Exploratio

  1. I.In the early stages of solar system formation, a fragment of an interstellar cloud of dust and gas collapsed and began rotating under the influence of gravity.II.The eight planets were originally orbiting a nearby star, and the Sun's gravity pulled those planets into orbit around the Sun.III.Gravity caused small particles in the rotating solar nebula to stick together and form larger particles
  2. The solar system is thought to have coalesced from a giant rotating cloud of gas and dust known as the solar nebula about 4.6 billion years ago. For decades, scientists have suspected a star..
  3. g as a result of a near-collision between our Sun and another star

The sun as well as the rest of the solar system was born from a cloud of gas and dust about 4.6 billion years ago. According to previous research, some event disturbed this cloud, prompting a.. T/F: The solar system formed a giant cloud of dust and gas that collapsed under gravity true, all stars and most planetary systems are made this way Extrasolar planets have been deleted by the direct imaging method, transit method, spectroscopic radial velocity method, gravitational lensing metho -This is why the inner planets collected less gas in their atmosphere than the outer planets. The solar system formed from a giant cloud of dust and gas that collapsed under gravity

The collapse of a massive gas cloud was considered to have resulted in the formation of the solar system. As everything else in the universe was spinning, it was assumed that the vast gas cloud had a spherical shape. However, this was later proven incorrect This states that the solar system developed out of an interstellar cloud of dust and gas, called a nebula. This theory best accounts for the objects we currently find in the Solar System and the distribution of these objects.The Nebular Theory would have started with a cloud of gas and dust, most likely left over from a previous supernova Scientists believe that the solar system was formed when a cloud of gas and dust in space was disturbed, maybe by the explosion of a nearby star (called a supernova). This explosion made waves in space which squeezed the cloud of gas and dust Our solar system began forming about 4.6 billion years ago within a concentration of interstellar dust and hydrogen gas called a molecular cloud. The cloud contracted under its own gravity and our proto-Sun formed in the hot dense center. The remainder of the cloud formed a swirling disk called the solar nebula

How Did the Solar System Form? Spac

• The idea that the solar system was born from the collapse of a cloud of dust and gas for proposed by Immanuel Kant (1755) and by Pierre Simon Laplace 40 years later. • During the first part of the 20th century, some proposed that the solar system was the result of a near collision of the Sun with another star. Planets formed fro According to this Nebular theory, the solar system was formed from a massive, rotating cloud of dust and gas called the Solar Nebula. It so happened that the Solar Nebula began collapsing under its own gravitational force Jeans Radius for cloud collapse. A cloud wtith radius R, mass M, and temperature T will collapse to form a star if the total energy of the cloud is <0, i.e, if the (absolute value) of the potential energy exceeds the thermal energy of the cloud: N is total number of particles in cloud. where. Assuming an isothermal (constant temperature) and.

Ch. 7 Problems Flashcards Quizle

Tour the Solar System; of many in M33 that's birthing new stars from massive clouds of dust and gas. the collision caused changes in the clouds' gas that made it collapse to form the. Our own solar system presumably formed as gravity caused the collapse of a similar large cloud of gas. The piece of cloud that formed our Solar System is known as the solar nebula. Click the photo to the left to see more images of the Orion Nebula According to the most widely accepted theory of planet formation (the Nebular Hypothesis), the Solar System began roughly 4.6 billion years ago from a massive cloud of dust and gas (aka. a nebula) One of the most amazing discoveries in space science is the unambiguous evidence from meteorites that the solar nebula (the cloud of gas and dust in which the Sun and planets formed) contained radioactive isotopes with half-lives so short that they no longer exist.These include isotopes with very short half-lives, such as calcium-41, 41 Ca, (100,000 years) and aluminum-26, 26 Al, (740,000.

The solar system formed from a massive cloud of gas and dust, which was slowly rotating. As the cloud collapsed under its own gravitational pull, the cloud started to spin faster, just as an ice skater pulling his arms in will spin faster. Because all of the material that accreted to form the planet was rotating, the planet was rotating as well A few billion years ago, after generations of more ancient suns had been born and died, a swirling cloud of dust and gas collapsed upon itself to give birth to an infant star. As the ball-shaped cloud fell inward it began to flatten and rotate, eventually resembling a spinning pancake. Mostly the stuff of the cloud was simple atoms of hydrogen.

• The idea that the solar system was born from the collapse of a cloud of dust and gas for proposed by Immanuel Kant (1755) and by Pierre Simon Laplace 40 years later. • During the first part of the 20th century, some proposed that the solar system was the result of a near collision of the Sun with another star. Planets formed fro 2.2 Our Solar System formed from a vast cloud of gas and dust 4.6 billion years ago. 2.3 Earth formed from the accumulation of dust and gas, and multiple collisions of smaller planetary bodies. 2.5 Studying other objects in the solar system helps us learn Earth's history. 2.6 Life on Earth began more than 3.5 billion years ago A cloud of gas and dust began to collapse 4.6 billion years ago, triggering the formation of Earth's sun and solar system. Pictured here: a much larger collection of gas and dust, spotted in the. Astronomers believe it formed about 4.5 billion years ago, when a massive interstellar cloud of gas and dust collapsed on itself, giving rise to the star that anchors our solar system—that big. The planets originate in a dense disk formed from material in the gas and dust cloud that collapses to give us the Sun. The density of this disk had to be sufficient to allow the formation of the planets and yet be thin enough for the residual matter to be blown away by the Sun as its energy output increased

Gravity's Role in the Solar System Flashcards Quizle

Stages of Star System Formation. Starting point: A cloud of interstellar gas and dust, the solar nebula; Most of it (98%) is hydrogen and helium, but it includes atoms and dust grains of heavier material, formed in previous generations of stars. Onset of formation: The nebula is already thicker than the average interstellar region, and possibly part of a chaotic region of starbirth; Because. The solar system supposedly formed gradually from the collapse of a cloud of gas and dust. Obviously, this idea is at odds with the biblical creation narrative. We can trace the origin of the modern theory of solar system formation to Emmanuel Swedenborg in 1734, but it was Emmanuel Kant who developed the idea in 1755 We know that interstellar clouds of gas and dust fragment into clumps and the clumps can collapse gravitation- the discovery of hundreds of planets beyond our solar system has shown that appears that the universe was much richer in the gas needed to form stars billions of years ago than it is today Location. The Sun and the planets formed together, 4.6 billion years ago, from a cloud of gas and dust called the solar nebula. A shock wave from a nearby supernova explosion probably initiated the collapse of the solar nebula. The Sun formed in the center, and the planets formed in a thin disk orbiting around it

I. Contraction of insterstellar cloud . Solar system formed about 4.6 billion year ago, when gravity pulled together low-density cloud of interstellar gas and dust (called a nebula). The Orion Nebula, an interstellar cloud in which star systems and possibly planets are forming. Initially the cloud was about several light years across Aug. 6, 2018 — Scientists believe the solar system was formed some 4.6 billion years ago when a cloud of gas and dust collapsed under gravity possibly triggered by a cataclysmic explosion from a. About 4.6 billion years ago, a giant cloud of dust and gas known as the solar nebula collapsed in on itself and began to form what would eventually become our solar system's sun and planets Astronomy Life Of Stars-Nebula; Massive cloud of dust-Protostar; Concentration of gas/dust that develops into a star after the Nebula collapses-Nuclear Fusion; When core temperatures rise to 15 million degrees (celsius), hydrogen atoms fuse together to form helium and lots of energy is produced Hertzsprung Russell Diagram-The mass of a star determines its life cycle-Diagram shows categories of. The Origin of the Solar System. Here is a brief outline of the current theory of the events in the early history of the solar system: A cloud of interstellar gas and/or dust (the solar nebula) is disturbed and collapses under its own gravity. The disturbance could be, for example, the shock wave from a nearby supernova

Solar System Formation • A cloud of gas, the solar nebula, collapses inwards under its own weight • Cloud heats up, spins faster, gets flatter (disk) as a central star forms • Gas cools and some materials condense as solid particles that collide, stick together, and grow large Formation of the Solar System. Planetary systems form around new stars. As an example, consider the solar system. We believe the early solar system was a cold cloud of interstellar gas that had a fairly fast rotation so not all of the gas could fall into the star forming at the center. This world was once a fluid haze of light, Till toward the. According to this theory, the Sun and all the planets of our Solar System began as a giant cloud of molecular gas and dust. Then, about 4.57 billion years ago, something happened that caused the. The solar system formed from a large gas nebula that had some dust grains in it. The nebula collapsed under its own gravity to form the Sun and planets. What triggered the initial collapse is not known. Two of the best candidates are a shock wave from a nearby supernova or from the passage through a spiral arm. The gas cloud that made our solar.

Exploding Star May Have Sparked Formation of Our Solar Syste

  1. Stars like our Sun are formed by the gravitational collapse of the densest parts of molecular clouds comprising dust and gas. Collapsing clouds swiftly evolve to form young stars surrounded by disks from which planets originate. The time scales and processes leading to the formation of our own solar system will be important clues to the birth environment of other planetary systems orbiting Sun.
  2. According to the _____, the Earth and solar system began to form nearly 5 billion years ago from the gravitational collapse of a huge cloud of dust and gases asked Sep 13, 2016 in Environmental & Atmospheric Sciences by doctor_wh
  3. Our Solar System is a collection of planets, asteroids, satellites, comets, meteoroids, dust, and gas orbiting our sun, a G2 V star. All the macroscopic bodies orbit the Sun in accordance with Kepler's laws, while the microscopic particles are affected by the solar wind and the magnetic fields of the Sun and planets

What scientists have not known is whether the ultraviolet processing occurred in the parent molecular cloud that collapsed to form the proto-solar system or later in the cloud of gas and dust from which the planets formed, called the solar nebula Those chemically rich leftovers orbiting our young Sun were stewing with all the ingredients to form the planets in our Solar System. Gas and dust contracted into a giant cloud, then floated in one of the spiral arms of the Milky Way. About 4.6 billion years ago a giant gas cloud composed mostly of hydrogen and helium collapsed to form. Vast regions of gas and dust, such as the Orion nebula shown below, are star factories. Stars form as clouds of interstellar gas and dust collapse, with much of the mass concentrated in the center. The central mass becomes a star, while the surrounding, flattened disk can form planets, asteroids, and comets surrounding the star The formation and evolution of the Solar System began about 4.5 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed By the time our solar system started to form -- about 9 billion years after the Big Bang -- gas clouds in this region of the Milky Way Galaxy had a composition of roughly 75 percent hydrogen by mass, 24 percent helium by mass, and roughly 1 percent everything else. step 1: hydrogen and helium gas

Astronomy Flashcards Quizle

Low-mass (less than two solar masses) stars form by collapse of individual cores or clumps in a cold, dark molecular cloud with molecular densities of hydrogen (n H2) of 10 4 to 10 5 cm -3, A V of 5 to 25, and temperatures as low as ∼10 K A vast assemblage of molecular gas that has more than 10 thousand times the mass of the Sun is called a giant molecular cloud (GMC).GMCs are around 15 to 600 light-years in diameter (5 to 200 parsecs) and typical masses of 10 thousand to 10 million solar masses. Whereas the average density in the solar vicinity is one particle per cubic centimetre, the average density of a GMC is a hundred to. Astronomers have discovered a new type of star system that defies everything we know about the formation of the Solar System. Known as a 'binary-binary', the system has two stars orbiting each other incredibly closely (like a traditional binary system), but the primary star also has two massive structures of its own in orbit.This is the first binary-binary system ever discovered - and its. In those distant reaches of the Solar System, the Sun's light grows weak, the temperatures of any gas clouds drop, and the motions of molecules in those clouds are slow. Cleaning up Current models suggest that the planets formed out of an initial disk of gas and dust over the course of 1 to 10 million years or so Our solar system began around 4.5 billion years ago as a huge cloud of gas and dust called a ~. This ~ rotated and created a gravity that was so intense that it collapsed. Many scientists think the sun and the rest of the solar system formed from a giant, rotating cloud of gas and dust known as the ~. As the nebula collapsed because of its.

A cold, relatively dense cloud of interstellar molecular gas a few pc, or about 10, 000 times bigger than Solar System The associated dust blocks starlight. Composition mostly H, He. Collisions cause rotational transitions in molecules - emission lines at mm wavelengths Our Sun and the Solar System have survived such a violent environment of 4.5 billion years ago. Most of the stars in our immediate cosmic neighborhood probably formed together in a dense cloud of gas and dust. Accompanied by massive stars that died out long ago, and bright emission nebula in the neighborhood excited by these bright stars Where did our solar system come from? Solar Systems form from the gravitational collapse of giant molecular clouds. Observations combined with computer models: suggest that solar systems like ours formed from giant molecular clouds. Ours may have been 60 light years wide - although they can be much larger. These broke into smaller fragments, I believe that our solar system formed by the same process as star formation. A. I believe that our solar system formed by the same process as star formation. A huge cloud of dust and gas collapsed and condensed. Gravity pulled matter into the center Solar system starter. A new study suggests a nearby supernova caused a massive gas cloud to collapse - and form the solar system. a cloud of gas and dust that eventually formed our solar.

Did a Supernova Give Birth to Our Solar System? Spac

Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction What scientists have not known is whether the ultraviolet processing occurred in the parent molecular cloud that collapsed to form the proto-solar system or later in the cloud of gas and dust from. They ended up everywhere in the solar system, at first. The vast majority of the primordial cloud the solar system was born from was hydrogen and helium, and the vast majority of the mass of that cloud ended up in the center to form the Sun. The S.. Module 3B THE FORMATION OF PLANETS 1) How did the solar system form? Our solar system started to evolve in a wispy cloud of gas and dust around 4.6 billion years ago. Part of the cloud collapsed in on itself at some point, likely due to the shockwave of a nearby supernova explosion, resulting in a flat spinning disk of dust and gas. Hydrogen atoms combine to form helium in nuclear fusion

The material that makes up the sun and the rest of the solar system came from the collapse of a large cloud of gas and dust about 4.5 billion years ago. By observing other stellar systems that. About 4.6 billion years ago, an enormous cloud of hydrogen gas and dust collapsed under its own weight, eventually flattening into a disk called the solar nebula. Most of this interstellar material contracted at the disk's center to form the sun, and part of the solar nebula's remaining gas and dust condensed to form the planets and the.

Some 4.6 billion years ago, our Sun was born from a cloud of interstellar gas and dust. It came from a giant molecular cloud — a collection of gas up to 600 light-years in diameter with the mass. The solar system is thought to have coalesced from a giant rotating cloud of gas and dust known as the solar nebula about 4.6 billion years ago Earth and the rest of the solar system coalesced from a giant cloud of gas and dust more than 4.5 billion years ago. Many of the details about the galactic neighborhood in which the solar system. Approximately 4.6 billion years ago, a swirling cloud of hydrogen gas and dust known as the solar nebula collapsed in on itself, giving way to the birth of the sun. The leftover material from this. According to this theory, the shock wave also injected material from the exploding star into a cloud of dust and gas, and the newly polluted cloud collapsed to form the Sun and its surrounding.

The generally accepted theory of solar system formation begins with a giant cloud of gas and dust that collapses under its own gravity. As the cloud contracts, most of its mass collects in the. I believe that our solar system formed by the same process as star formation. A huge cloud of dust and gas collapsed and condensed. Gravity pulled matter into the center core, nuclear fusion began, and our Sun was created. Physics. Two asteroids of equal mass collide as shown in the figure Scientists believe that the Solar System evolved from a giant cloud of dust and gas. They believe that this dust and gas began to collapse under the weight of its own gravity. As it did so, the matter contained within this could begin moving in a giant circle, much like the water in a drain moves around the center of the drain in a circle

Astronomy Chapter 5 Flashcards Quizle

  1. About 4.6 billion years ago, an enormous cloud of hydrogen gas and dust collapsed under its own weight, eventually flattening into a disk called the solar nebula
  2. Meteorites, comets, and asteroids are survivors of the solar nebula out of which the solar system formed. This nebula was the result of the collapse of an interstellar cloud of gas and dust, which contracted (conserving its angular momentum) to form our star, the Sun, surrounded by a thin, spinning disk of dust and vapor
  3. Our solar system is a one-way boulevard. All the planets --- from Mercury out to Pluto and even the newly discovered objects beyond --- revolve around the Sun in the same direction. This is because the Sun and planets formed from the same massive, rotating cloud of dust and gas. The motion of that cloud set the motion of the planets
  4. Stars are thought to form inside giant clouds of cold molecular hydrogen—giant molecular clouds of roughly 300,000 M ☉ and 65 light-years (20 pc) in diameter. Over millions of years, giant molecular clouds are prone to collapse and fragmentation. These fragments then form small, dense cores, which in turn collapse into stars. The cores range in mass from a fraction to several times that of.
  5. According to the study, the solar system could have formed inside of one of these bubbles. Since such a huge amount gas and dust is trapped inside, the shell of such a bubble is a good place to.
  6. 8. The planets of the solar system formed as _____. A. the center of the gas cloud cooled B. planetesimals flattened into a rotating disk C. planetesimals collided into one another D. the sun absorbed extra gas and dust from the solar system 9. How long ago was our sun formed? A. 10 million years ago C. 5 million years ago B. 4.5 billion years ago D. 2 billion years ago 10

Astro CH 5 Flashcards Quizle

  1. Jonathan: In a previous post, I explained roughly how planets form. Here's a recap: When the solar system coalesced out of dust and gas, the distance radially from the center of mass of the solar system for concentrations within this dusty gas cloud attracted more and more matter as a function of time
  2. For several decades, scientists have thought that the Solar System formed as a result of a shock wave from an exploding star—a supernova—that triggered the collapse of a dense, dusty gas cloud.
  3. A low-mass supernova 4.6 billion years ago triggered the formation of our solar system and its planets. About 4.6 billion years ago, a cloud of gas and dust that eventually formed our solar system.
  4. Molecular Clouds: Stellar Nurseries. As we saw in Between the Stars: Gas and Dust in Space, the most massive reservoirs of interstellar matter—and some of the most massive objects in the Milky Way Galaxy—are the giant molecular clouds.These clouds have cold interiors with characteristic temperatures of only 10-20 K; most of their gas atoms are bound into molecules
  5. Vast clouds of gas and dust are swirling throughout our Milky Way galaxy. Some of these clouds are stellar nurseries, places where thousands of stars like our Sun are being born right now. These clouds are huge, about 100,000 times the size of our solar system and many thousands of times the mass of our Sun. Life Rises from a Death Spiral

(13) - The collapse of a massive gas cloud was considered

  1. The dust become condensaton sits for gas and become ICE COVERED DUST Clouds begin to collapse under self-gravity dust begins to accrete Clouds collapse to a rotaton disk o Inner region Collapses faster & sun forms before planets o Outer region Evolves slower into thin disk of partcles and a thicker outer disk of gases. PLANETS ARE BYPRODUCTS OF STAR FORMATIONS Downloaded by Khadi Louzir.
  2. • It starts with cold interstellar clouds of gas and dust • The cloud begins to collapse Solar System Formation much like the solar nebula collapsed to form the solar system •This takes much less time than the core-accretion mode
  3. Solar System Formation { History Georges Bu on suggested (1745) that the planets formed when a massive object (a comet, he thought) collided with the Sun and splashed out debris that coalesced into planets. Immanuel Kant proposed (1755) that the solar system formed from the gravitational collapse of an interstellar gas cloud
  4. g today. Ð The are always found within interstellar clouds of gas
  5. Our Solar System formed from a gas cloud about halfway towards the edge of the disk, about 25,000 light-years from the center, in the central part of the disk if you were to slice it length-wise
  6. Interstellar objects (ISOs), the parent population of 1I/Oumuamua and 2I/Borisov, are abundant in the interstellar medium of the Milky Way. This means that the interstellar medium, including molecular cloud regions, has three components: gas, dust, and ISOs. From the observational constraints for the field density of ISOs drifting in the solar neighbourhood, we infer a typical molecular cloud.
  7. g the sun

Galactic crash may have triggered solar system formation. The Sagittarius dwarf galaxy has been orbiting the Milky Way for billions for years. As its orbit around the 10 000 more massive Milky Way. The most widely accepted explanation for the formation of the solar system is called the nebular hypothesis. According to this hypothesis, the sun and planets of our solar system formed about 4.6 billion years ago from the collapse of a giant cloud of gas and dust called a nebula. The nebula collapsed because it was drawn together by gravity The nebular model maintains that our solar system began to form when a fragment of a giant cloud of dust and gas began to collapse due to the gravitational forces exceeding the forces related to gas pressure that expanded it (Montmerle, et al, 2006. p.47) Solar system Major features of the Solar System; sizes and distances not to scale. From left to right): Pluto, Neptune, Uranus, Saturn, Jupiter, the asteroid belt, the Sun, Mercury, Venus, Earth and its Moon, and Mars. A comet is also seen on the left. The Solar System or solar system consists of the Sun and the other celestial objects.

The Nebular Theory Introduction to Astronom

Jupiter and Saturn are thought to have formed first, and quickly -- within the first 10 million years of the solar system. In the warmer reaches of the disk, closer to the star, rocky planets take shape after the icy giants form -- and there's not a lot of gas left for the terrestrial planets to snag In this article we explain the process of star formation for regular Sun-like stars. Stars form from an accumulation of gas and dust, which collapses due to gravity and starts to form stars. The process of star formation takes around a million years from the time the initial gas cloud starts to collapse until the star is created and shines like the Sun. The leftover material from the star's. The history of our solar system started with the gravitational collapse of an interstellar molecular cloud laden with gas and dust supplied from dying stars. The dust from this cloud is the topic of this review. A small fraction of this dust escaped destruction during the many processes that occurred after molecular cloud collapse about 4.55 Ga.

Scientists believe that the Solar System evolved from a giant cloud of dust and gas. They believe that this dust and gas began to collapse under the weight of its own gravity. As it did so, the matter contained within this could begin moving in a giant sphere, much like the water in a drain moves around in the center of the drain in a circle.At. The solar nebular has several stages. The inner solar system is mainly filled with comets that loop in from the outer reaches of the solar system on elliptical orbits. Solar formation began billions of years ago, when hydrogen gas and dust formed together to create the sun, rocky planets, other bodies of the solar system

Solar System Formation: Gas & Dust to Solar Nebula to Sun

Beyond Our Solar System. More than 200,000 stars are visible in this image from the TESS spacecraft. More. Our Sun is one of at least 100 billion stars in the Milky Way, a spiral galaxy about 100,000 light-years across. The stars are arranged in a pinwheel pattern with four major arms, and we live in one of them, about two-thirds of the way. A solar system is a group of heavenly bodies consisting of a star and the planets and other objects orbiting around it. Our system consists of the sun and the planetary bodies orbiting it such as the eight (formerly nine) planets, three dwarf planets, about 160 known planetary satellites (), and countless asteroids.The solar system also consists of many various icy bodies, and vast amounts of. The Oort Cloud is the most distant region of our solar system. Even the nearest objects in the Oort Cloud are thought to be many times farther from the Sun than the outer reaches of the Kuiper Belt. Unlike the orbits of the planets and the Kuiper Belt, which lie mostly in the same flat disk around.

Formation of the Solar System: Birth of World

Ultraviolet Shines Light on Origins of Our Solar System. The Butterfly nebula, an example of a star forming region in the Tarantula nebula. The white scale bar is 2 light years or about 120,000 AU (Astronomical Units). A bright central star, obscured by dust, modifies the oxygen isotopes in the nebula by photodissociation of carbon monoxide Astronomers now know when the solar system's molecular cloud began to collapse, it measured 100 astronomical units across (1 astronomical unit is the average distance between the Sun and Earth. Through a combination of theoretical chemistry, telescope observations and laboratory experiments at Leiden University, van Dishoeck and her collaborators and colleagues have established that water originated in the interstellar cloud of gas and dust that, 4.5 billion years ago, gravitationally collapsed to form our solar system protostar: A collapsing cloud of gas and dust destined to become a star. protostellar disk: A gas cloud around a forming star flattened by its rotation. A small body of rock and/or ice - under 10 kilometers (6 miles) across - formed during the early stages of the solar system Stars form from the diffuse, cold interstellar gas that makes up molecular clouds. These clouds span roughly 100 light-years and hold between 10,000 and 1 million solar masses of material

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