what happens after many generations of the star-gas-star cycle?
What Happens After Many Generations Of The Star-gas-star Cycle??
What happens after many generations of the star-gas-star cycle? hydrogen gas decreases. Where will most of the gas be in 1 trillion years? abundant in molecular clouds?Nov 29, 2018
What is the star-gas-star cycle?
Star-Gas-Star Cycle. Star-Gas-Star Cycle. process of galactic recycling in which stars expel gas into space, where it mixes with interstellar medium and eventually forms new stars. Bubble. an expanding shell of hot, ionized gas driven by stellar winds or supernova with very hot and very low density gas inside.
Will the star-gas-star cycle continue forever?
The star-gas-star cycle will continue forever because stars are continually recycling gas. Almost all elements heavier than hydrogen and helium were made inside stars. Most of the mass of the Milky Way is located in the halo of the galaxy in the form of dark matter.
When stars die they return as much as of their mass to interstellar space?
As the stars age, evolve, and eventually die, massive stars lose a large fraction of their mass, and low-mass stars lose very little. On average, roughly one-third of the matter incorporated into stars goes back into interstellar space.
What effect does the star-gas-star cycle have on the amount of heavy elements?
Answer: The star-gas-star cycle gradually enriches the interstellar medium with heavy elements. Therefore, stars that formed early in the history of the galaxy were formed before much enrichment from supernova events could take place.
How would you expect a star that formed recently in the disk of the galaxy to differ from one that formed early in the history of the disk?
How would you expect a star that formed recently in the disk of the galaxy to differ from one that formed early in the history of the disk? It should have a higher fraction of elements heavier than hydrogen and helium.
How do halo stars differ from disk stars?
Disk stars come in a broad range of masses and colors, while halo stars are mostly of low mass and red. Clusters of young stars are found only in the disk. Stars in the disk all orbit in the same direction and nearly the same plane, while halo stars have more randomly oriented orbits.
What is Sgr A * quizlet?
What is Sgr A*?A source of bright radio emission in the center of our galaxy.
What kinds of stars lie in the halo of our galaxy?
The Milky Way’s stellar halo contains globular clusters, RR Lyrae stars with low metal content, and subdwarfs. Stars in our stellar halo tend to be old (most are greater than 12 billion years old) and metal-poor, but there are also halo star clusters with observed metal content similar to disk stars.
What is the net effect of the star gas star cycle?
Over time, what is the net effect of the star-gas-star cycle in the Milky Way? The total mass in the galaxy’s interstellar medium is gradually reduced, and the remaining gas is continually enriched in heavy elements.
What is the first stage in the life cycle of a star?
The gas in the nebula begins to glow. This is the first step in the life cycle of a star. It is called a protostar. This chemical change gives off a large amount of energy in the form of heat.
What happens to the end of an average star like our sun?
All stars die, and eventually — in about 5 billion years — our sun will, too. Once its supply of hydrogen is exhausted, the final, dramatic stages of its life will unfold, as our host star expands to become a red giant and then tears its body to pieces to condense into a white dwarf.
Why is the nebula dark?
What causes a dark nebula? They are caused by interstellar clouds with a very high concentration of dust grains obscuring light. These dust clouds obscure and block visible light objects behind it. Such as background stars or emission or reflection nebulae.
What is the protostar stage?
A protostar is a very young star that is still gathering mass from its parent molecular cloud. The protostellar phase is the earliest one in the process of stellar evolution. For a low-mass star (i.e. that of the Sun or lower), it lasts about 500,000 years. See also where does most of the world's population tend to settle?Where in the galaxy would you expect ongoing star formation?
spiral arms
Spiral galaxies are named by their spiral structures that extend from the center into the galactic disc. The spiral arms are sites of ongoing star formation and are brighter than the surrounding disc because of the young, hot OB stars that inhabit them.
What is star life cycle?
Massive stars transform into supernovae, neutron stars and black holes while average stars like the sun, end life as a white dwarf surrounded by a disappearing planetary nebula. All stars, irrespective of their size, follow the same 7 stage cycle, they start as a gas cloud and end as a star remnant.
What causes different stars to evolve differently quizlet?
Gravity & Internal heat: balance that determines evolutionary stage of a star’s life.
Why are stars no longer forming in the galactic halo?
Why has star formation ceased in the galactic halo? All of the galaxy’s cool gas settled to the galactic plane long ago. How do we learn about the conditions at the center of our own galaxy, the Milky Way? detected and used to determine the conditions there.
How do disk stars orbit the center of the galaxy?
How do disk stars orbit the center of the galaxy? They all orbit in roughly the same plane and in the same direction. They follow spiral paths along the spiral arms. They follow orbits that move up and down through the disk, typically taking them about 50,000 light-years above and below the disk on each orbit.
Do stars closer to the galactic center have shorter or longer periods?
The motion of the stars is differential rotation: the stars closer to the centre have a shorter orbital period than the stars further out.
What are population 1 stars How do they differ from population 2 stars?
Extreme Population I stars (the most metal rich stars) are found only in the spiral arms; these are the youngest stars. Intermediate Population I stars (like the Sun) are located through the disk. They are slightly less metal rich. Population II stars are metal poor stars; they contain about 0.1 percent metals.
How do theories of the origin of the Milky Way explain its halo?
How do theories of the origin of the Milky Way explain its halo? Originally, the Milky Way started off as a spherical cloud of gas, stars, and star clusters. Over time, this sphere contracted toward its equator until it was a flat disk. The Milky Way’s halo is the remnants of the spherical shape before it flattened.
What is Sagittarius A * quizlet?
Sagittarius A. is a bright and very compact astronomical radio source at the center of the Milky Way Galaxy, It is believed to be the location of a supermassive black hole, which is now generally accepted to be at the centers of many spiral and elliptical galaxies. Shapley-Curtis debate.
What does Hubble’s law state?
Hubble’s law, also known as the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance. In other words, the farther they are the faster they are moving away from Earth. See also how to use engineer directional compassWhat is SgrA *? What evidence suggests that it contains a massive black hole?
What evidence suggests that it contains a massive black hole? SgrA is a source of radio emission that is located within the center of our galaxy. Several hundred stars crowd it are within 1 light year away. Say that there are not enough stars and gas to account for all the mass which is 3-4 solar million mass.
Is the sun a population 1 star?
The Sun is considered Population I, a recent star with a relatively high 1.4 percent metallicity. Note that astrophysics nomenclature considers any element heavier than helium to be a “metal”, including chemical non-metals such as oxygen.Is the sun in the halo of the Milky Way?
Bottom line: The sun is about 1/3 the distance from the center of the Milky Way galaxy to its outer edges. It’s located in a smaller spiral arm, between two large arms, called the Orion Arm.
Is irregular a galaxy?
Irregular galaxies have no particular shape. They are among the smallest galaxies and are full of gas and dust. Having a lot of gas and dust means that these galaxies have a lot of star formation going on within them. This can make them very bright.
How do stars affect the interstellar medium?
When stars die, they, in turn, eject some of their material into interstellar space. This material can then form new clouds and begin the cycle over again.How do we now think that gas between stars gets that hot?
Some of the gas in interstellar space is at a temperature of a million degrees, even though it is far away in hot stars; this ultra-hot gas is probably heated when rapidly moving gas ejected in supernova explosions sweeps through space.
How do planets form from interstellar matter?
At the end of a star’s existence, stars expel gas back into their surroundings in either a giant ‘Supernova’ explosion, a planetary nebula or via stellar winds, and eventually this gas is recycled in a new generation of stars. … See also what will happen if earth loses its gravityWhat are the 5 stages of a star?
The formation and life cycle of stars- A nebula. A star forms from massive clouds of dust and gas in space, also known as a nebula. …
- Protostar. As the mass falls together it gets hot. …
- Main sequence star. …
- Red giant star. …
- White dwarf. …
- Supernova. …
- Neutron star or black hole.
What are the three end stages of stars?
Three end stages of stars are:- White Dwarf.
- Neutrons Star.
- Black Hole.
What happens at the end of a stars cycle?
Near the end of its nuclear burning stage, such a star expels most of its outer material (creating a planetary nebula) until only the hot (T > 100,000 K) core remains, which then settles down to become a young white dwarf. … Eventually, such stars cool completely and become black dwarfs.
