what is a group of stars, gases and dust held together by gravity
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- Add this question to a group or test by clicking the appropriate button below. Grade 6 Universe Large group of stars, dust, and gas held together by gravity, can be elliptical, spiral, or irregular: Galaxy You need to have at least 5 reputation to vote a question down. Learn How To Earn Badges.
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Galaxies Oasis in Space. Galaxies are defined as large groupings of stars, dust, and gas held together by gravity. They vary greatly in size and shape. Most of the objects we know of in space are contained within galaxies. They contain stars, planets, moons, comets, asteroids, nebulae, dust, neutron stars, and black holes. Many probably even contain large amounts of unseen dark matter. Since most of the space between galaxies is thought to be empty, a galaxy is essentially an oasis in space. Our own solar system is located within a galaxy. Our Sun is only one of over 100 billion stars in a galaxy called the Milky Way.
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Galaxies Our galaxy, the Milky Way, is typical: it has hundreds of billions of stars, enough gas and dust to make billions more stars, and about six times as much dark matter as all the stars and gas put together. And it’s all held together by gravity. Like more than two-thirds of the known galaxies, the Milky Way has a spiral shape. At the center of the spiral, a lot of energy and, occasionally, vivid flares. are being generated. Based on the immense gravity that would be required explain the movement of stars and the energy expelled, the astronomers conclude that at the center of the Milky Way is a supermassive black hole.
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What are stars made of? Stars are made of very hot gas. This gas is mostly hydrogen and helium, which are the two lightest elements. Stars shine by burning hydrogen into helium in their cores, and later in their lives create heavier elements. Most stars have small amounts of heavier elements like carbon, nitrogen, oxygen and iron, which were created by stars that existed before them. After a star runs out of fuel, it ejects much of its material back into space. New stars are formed from this material.
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- Cancel. A nebula is an interstellar cloud that is comprised of dust and light elements such as hydrogen and helium. Find out about ho gravity and pressure keep nebulas from collapsing with help from an applied physics professional in this free video clip.Part of the Video Series: Such Great Physics.ideo Transcript. Hello, my name is Walter Unglaub, and this is how do gravity and pressure keep nebulas from collapsing. A nebula is an interstellar cloud that is comprised of dust and light elements such as hydrogen and helium.
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- A nebula is a massive cloud of gas and other materials that is revolving around one focal point which is the most massive point and therefore has the strongest gravity which m … akes the rest of the cloud revolve around it. This eventually creates a star.
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- When accretion is at work on a solar system scale, we're usually talking about the forces at work in a nebula, which is a celestial cloud of gas and dust. It's explained by nebular theory, which describes the forces and processes at play as a nebula spins and accretes into a star and its planets orbiting it.
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Main sequence Stars below about 1.5 times the mass of the Sun (or 1.5 solar masses (M☉)) primarily fuse hydrogen atoms together in a series of stages to form helium, a sequence called the proton–proton chain.
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- the pressure pushes the nebula together just like magnets to keep it from falling or collapsing, and the gravity pulls the exess debri into the nebula to keep it packed tight. ….15 people found this useful. Johnellishartford. 14,277 Contributions. Irregularities in the density of the gas causes a net gravitational force that pulls the gas molecules closer together. Some astronomers think that a gravitational or m … agnetic disturbance causes the nebula to collapse.
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What are stars made of? Stars are made of very hot gas. This gas is mostly hydrogen and helium, which are the two lightest elements. Stars shine by burning hydrogen into helium in their cores, and later in their lives create heavier elements. Most stars have small amounts of heavier elements like carbon, nitrogen, oxygen and iron, which were created by stars that existed before them. After a star runs out of fuel, it ejects much of its material back into space. New stars are formed from this material. So the material in stars is recycled.
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Nebula nebulae are often star forming regions such as in the pillars of creation in the eagle nebula in these regions the formations of gas dust and other materials clump together to form denser regions which attract further matter and eventually will become dense enough to form stars
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A Star is Born A Star is Born Stars form in the densest regions of the interstellar medium, or ISM, called molecular clouds. The ISM is the name given to the gas and dust that exists between the stars within a galaxy.It is 99% gas and 1% dust, by mass.tars form in the densest regions of the interstellar medium, or ISM, called molecular clouds. The ISM is the name given to the gas and dust that exists between the stars within a galaxy.
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- This article is about the astronomical term. You may be looking for the Star Wars galaxy. A galaxy was a massive, gravitationally bound assemblage of stars, an interstellar medium of gas and dust, and an unknown type of dark matter.
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Open cluster An open cluster, also known as galactic cluster, is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.
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Galaxies Our galaxy, the Milky Way, is typical: it has hundreds of billions of stars, enough gas and dust to make billions more stars, and about six times as much dark matter as all the stars and gas put together. And it’s all held together by gravity. Like more than two-thirds of the known galaxies, the Milky Way has a spiral shape.
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- A galaxy is an enormous collection of gas, dust and billions of stars held together by gravity. One galaxy can have hundreds of billions of stars and be as large as 200,000 light years across.
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- According to the nebula hypothesis, the Solar System began as a nebula, an area in the Milky Way Galaxy that was a swirling concentration of cold gas and dust. Due to some perturbation, possibly from a nearby supernova, this cloud of gas and dust began to condense, or pull together under the force of its own gravity.
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- Pronunciation of Janza in English Our web site serves multilingual pronunciation dictionaries. We are providing audio Pronunciation guide to learn how to pronounce English words correctly with multilingual talking dictionary, Here just enter your words then get digital mp3 audio in a few seconds.
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- However, this is not really true. Much of the space between the stars is filled with atomic and molecular gas (primarily hydrogen and helium) and tiny pieces of solid particles or dust (composed mainly of carbon, silicon and oxygen). In some places this interstellar material is very dense, forming nebulas.
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Interior Structure of Stars Greater gravity compresses the gas, making it denser and hotter, so the outward pressure increases. In any given layer of a star, there is a balance between the thermal pressure (outward) and the weight of the material above pressing downward (inward). This balance is called hydrostatic equilibrium. A star is like a balloon. In a balloon the gas inside the balloon pushes outward and the elastic material supplies just enough inward compression to balance the gas pressure. In a star the star's internal gravity supplies the inward compression.
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- Ronald Reagan was 69 years old when he was elected President and turned 70 after he took office. Obviously he was eight years older, 77, almost 78, when he left office after … serving two full terms.He was the oldest US president. That was where he spent the most successful years of his political career. He was elected Governor of California and later President of the United States as a Republican, and was closely aligned with Republican causes throughout his time in office.
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Astronomy Unit 2 (Worksheet) Explain how the nebular hypothesis accounts for the difference in the chemical make-up of Terrestrial and Jovian planets. The gas and dust within it first concentrated near the center in the protosun. As this heated up, radiation pressure pushed the lighter gases and dust away, leaving the heavier elements near the protosun. In time these swept together to first form planetisimals, then the terrestrial planets.
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Life Cycles of Stars Stars are believed to form when clouds of interstellar gas and dust start to contract under the influence of gravity. In interstellar space, far from other stars, a cloud of gas can be very thin and still be dense enough to begin contracting.
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Astronomy Chapter 9 Some of this gas drags away dust particles and the gas and dust create this dusty atmosphere called the coma. The coma grows as it continues into the solar system and some of the gas and dust is pushed away from the sun forming the tails.
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- A nebula is an interstellar cloud in outer space that is made up of dust, hydrogen and helium gas, and plasma. It is formed when portions of the interstellar medium collapse and clump together due to the gravitational attraction of the particles that comprise them.
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- You have Terrestrial Planets and Gas-giants because, before the early solar system formed, matter around the area that we call our solar system formed a disk of gas and dust. … Most of this matter was in the center. Matter clumped together due to gravity. The disk flattened while spinning faster and faster.