What is the star-gas-star cycle quizlet?
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.
How does the star-gas-star cycle start?
Molecular clouds collapse due to gravity to form new stars, thereby completing the star-gas-star cycle. Young massive stars can erode the birth clouds, preventing further star formation. Only a small fraction of gas in molecular clouds forms into stars. Stars make new heavy elements by fusion.
How does the movement of disk stars differ from that of Halo stars?
How do stellar orbits in the disk differ from those in the halo? Stars in the disk all orbit the galactic center in about the same plane and in the same direction. Halo stars also orbit the center of the galaxy, but with orbits randomly inclined to the disk of the galaxy.
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.
When we talk about the star-gas-star cycle we are describing the?
What do we mean by the star-gas-star cycle? It is the continuous recycling of gas in the galactic disk between stars and the interstellar medium.
How does the star-gas-star cycle affect the interstellar medium of a galaxy?
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.
What are the 7 stages of a star?
All stars, irrespective of their size, follow the same 7 stage cycle, they start as a gas cloud and end as a star remnant.
- Giant Gas Cloud. A star originates from a large cloud of gas. …
- Protostar. …
- T-Tauri Phase. …
- Main Sequence. …
- Red Giant. …
- The Fusion of Heavier Elements. …
- Supernovae and Planetary Nebulae.
What happens to stars as they age?
Stars with higher mass have shorter lifespans. When the sun becomes a red giant, its atmosphere will engulf the Earth. During the red giant phase, a main sequence star's core collapses and burns helium into carbon. After about 100 million years, the helium runs out, and the star turns into a red supergiant.
Where does most of the star formation happen in spiral galaxies group of answer choices the halo the bulge the disk all of the above?
Much of the star formation in the disk happens in the spiral arms. Spiral arms are waves of star formation. Spiral arms are waves of star formation. 1.
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.
How do we think the first generation of stars would have been different from stars born today?
The first generation stars were all very massive and exploded as supernova. Why do we think the first generation of stars would be different from stars born today? Without heavy elements, the clouds could not reach as low a temperature as today and had to be more massive to collapse.
When we talk about the star gas star cycle we are describing the?
What do we mean by the star-gas-star cycle? It is the continuous recycling of gas in the galactic disk between stars and the interstellar medium.
Which event takes place first in the stages before the birth of a star?
A protostar is the earliest stage of a star's life. A star is born when the gas and dust from a nebula become so hot that nuclear fusion starts.
How does the life cycle of a star compare to that of a human?
How does the life cycle of humans compare to the life cycle of a star? They both have stages where they are born and die which is in the main sequence and supernova and in a human they are born in a womb and die of old age.
How do stars evolve?
Due to fusion, stars evolve due to two factors: gravity and pressure. The star collapses when gravity exceeds pressure, and the star expands when pressure overcomes gravity. The evolution of stars is driven by nuclear fusion and fission events in the stars. The mass of the stars determines their final stage.
How does a star collapse?
Eventually the core of the star runs out of hydrogen. When that happens, the star can no longer hold up against gravity. Its inner layers start to collapse, which squishes the core, increasing the pressure and temperature in the core of the star.
What are the stages of evolution of a star?
Different stages of life cycle of stars are: Giant Gas Cloud. Protostar. T-Tauri Phase.
What are the stages of a star’s life cycle?
Step 1 – Green – A cloud of gas and dust collapses due to gravity, creating a protostar. Step 2 – Blue – Gravitational energy powers the young star until… Step 3 – Yellow – … nuclear fusion occurs.
How do stars end their life cycle?
With no fuel left to burn, the hot star radiates its remaining heat into the coldness of space for many billions of years. In the end, it will just sit in space as a cold dark mass sometimes referred to as a black dwarf.
How do stars change over time?
Smaller stars use up fuel more slowly so will shine for several billion years. Eventually, the hydrogen which powers the nuclear reactions inside a star begins to run out. The star then enters the final phases of its lifetime. All stars will expand, cool and change colour to become a red giant.
Where does most of the star formation happen in spiral galaxies group of answer choices?
Where does most star formation occur in the Milky Way galaxy today? In the spiral arms.
Where is star formation most likely to occur in our galaxy quizlet?
Much of the star formation in the disk happens in the spiral arms. Spiral arms are waves of star formation. Spiral arms are waves of star formation. 1.
What is a planetary nebula quizlet?
A planetary nebula is the ejected shell of an evolved giant star. It is the shape of a spherical shell and is composed of relatively cool thing gas, which was once the outer part of the star. A planetary nebula is associated with the death of a low mass star. You just studied 15 terms!
How many years does it take our solar system to complete one orbit around the Milky Way?
about 230 million years Yes, the Sun – in fact, our whole solar system – orbits around the center of the Milky Way Galaxy. We are moving at an average velocity of 828,000 km/hr. But even at that high rate, it still takes us about 230 million years to make one complete orbit around the Milky Way!
How many generations of stars have there been?
In a large, massive galaxy like our Milky Way, the atoms and molecules that form stars likely have been a part of many different generations of stars over our cosmic history. Some of them may only have been part of 1 or 2 generations of stars; others could have belonged to 6 generations or more!
Why would it have been hard for the first generation of stars to have planets if they did have planets of what would they have been composed?
If they did have planets, of what would those bodies have been composed? Heavy elements like oxygen, carbon, and silicon first needed to be created from explosions of huge stars called supernovas and the stellar cores of stars from the first generation before the first planets could be formed.
What are the 7 stages of star formation?
Formation of Stars Like the Sun
- STAGE 1: AN INTERSTELLAR CLOUD.
- STAGE 2: A COLLAPSING CLOUD FRAGMENT.
- STAGE 3: FRAGMENTATION CEASES.
- STAGE 4: A PROTOSTAR.
- STAGE 5: PROTOSTELLAR EVOLUTION.
- STAGE 6: A NEWBORN STAR.
- STAGE 7: THE MAIN SEQUENCE AT LAST.
What are the 10 stages of a star?
What are the different stages of life cycle of stars?
- Giant Gas Cloud.
- Protostar.
- T-Tauri Phase.
- Main Sequence.
- Red Giant.
- The Fusion of Heavier Elements.
- Supernovae and Planetary Nebulae.
What will happen when a star reaches the final stage of its existence after becoming a red giant?
However, their life cycles start to differ after the red giant phase. A massive star will undergo a supernova explosion. If the remnant of the explosion is 1.4 to about 3 times as massive as our Sun, it will become a neutron star.
What are the end stages of stars?
A planetary nebula is the final stage of a Sun-like star. As such, planetary nebulas allow us a glimpse into the future of our own solar system. A star like our Sun will, at the end of its life, transform into a red giant.