What is the life cycle of a star?
Life Cycles of Stars. A star's life cycle is determined by its mass. The larger its mass, the shorter its life cycle. A star's mass is determined by the amount of matterthat is available in its nebula, the giant cloud of gas and dust from which it was born. Over time, the hydrogengas in the nebula is pulled together by gravityand it begins to spin.
What are the 5 stages of the Star Cycle?
1 Giant Gas Cloud. A star originates from a large cloud of gas. ... 2 Protostar. When the gas particles in the molecular cloud run into each other, heat energy is produced. ... 3 T-Tauri Phase. ... 4 Main Sequence. ... 5 Red Giant. ... 6 The Fusion of Heavier Elements. ... 7 Supernovae and Planetary Nebulae. ...
What happens in the red giant phase of the Star Cycle?
The outer shell of the star, which is still mostly hydrogen, starts to expand. As it expands, it cools and glows red. The star has now reached the red giant phase. It is red because it is cooler than it was in the main sequence star stage and it is a giant because the outer shell has expanded outward.
What is an example of a star in a gas cloud?
Giant Gas Cloud A star originates from a large cloud of gas. The temperature in the cloud is low enough for the synthesis of molecules. The Orion cloud complex in the Orion system is an example of a star in this stage of life.
How does gas cycle through galaxies quizlet?
How is gas recycled in our galaxy? Gas from dying stars mixes new elements into the interstellar medium, which slowly cools, making the molecular clouds where stars form. Those stars will eventually return much of their matter to interstellar space.
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 do stars form in the Milky Way?
Star Formation 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.
How does gas cycle through galaxies?
Out in intergalactic space, the gas cools and gets denser, until gravity pulls it back into the galaxy where new stars form. The process repeats: Gravity condenses gas into galaxies and stars, stars blow up and kick the gas out, gravity cycles the gas back in and makes new stars.
Why do spiral arms have a blue color?
The gas and dust in the arms filter out all but the blue light from stars in the arms. Stars are forming in the spiral arms so there are many more high mass, hot, blue stars. Almost all the stars of the disk are in the arms of the galaxy and their light makes it appear blue.
What kind of object do we think lies in the center of the Milky Way galaxy?
Astronomers believe that supermassive black holes lie at the center of virtually all large galaxies, even our own Milky Way.
Are new suns born?
We can wonder how our galaxy can contain 100 to 200 billion suns when the Universe is 13.8 billion years old: with a rate of 3 new suns born every year, the figure is far too high!
How is a star formed step by step?
Formation of Stars Like the SunSTAGE 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.
How is a star created?
A star is born when atoms of light elements are squeezed under enough pressure for their nuclei to undergo fusion. All stars are the result of a balance of forces: the force of gravity compresses atoms in interstellar gas until the fusion reactions begin.
Why is the star gas Cycle important?
They provide metals to the intracluster medium, they form galactic fountains, shells and supershells, they influence the galaxy evolution and help to concentrate the mass to the galactic central regions.
What is the gas in galaxies?
The gas between stars is mostly hydrogen and helium scattered at varying densities between the stars in our galaxy and other galaxies. The proportions of the gases are similar to those in the Sun. Interstellar gas supplies the raw material for star formation.
What is in the space between stars?
Bottom line: The interstellar medium is the stuff between the stars. Made up mostly of hydrogen and helium gas – plus trace amounts of ices, silicate grains, and all the other elements – it contains all the material needed to make stars and planets.
What happens when gas stars are ejected?
the ejected gas stars to cool and forms clouds
What is the process of regenerating stars?
The process of galactic recycling in which stars (supernovae) expel gas into space, where it mixes with the interstellar medium and eventually forms new stars
What do supernovae bubbles generate?
Supernovae-made bubbles generate shock fronts. What do these do?
Which stars complete their orbits in less time than the stars near the center of the galaxy?
about the same velocities, meaning that stars near the edge complete their orbits in less time than the stars near the center of the galaxy
What is the interstellar medium?
interstellar gas and dust — known as the interstellar medium
How does the life cycle of a star work?
Life Cycle Of A Star. Stars go through a natural cycle, much like any living beings. This cycle begins with birth, expands through a lifespan characterized by change and growth, and ultimately leads to death. The time frame in the life cycle of stars is entirely different from the life cycle of a living being, lasting in the order of billions ...
How does a star expand?
Without the reactions occurring at the core, a star contracts inward through gravity causing it to expand.
What is the T-Tauri phase?
T-Tauri Phase. A T-Tauri star begins when materials stop falling into the Protostar and release tremendous amounts of energy. The mean temperature of the Tauri star isn’t enough to support nuclear fusion at its core.
How does helium fusion work?
Helium molecules fuse at the core, as the star expands. The energy of this reaction prevents the core from collapsing. The core shrinks and begins fusing carbon, once the helium fusion ends. This process repeats until iron appears at the core. The iron fusion reaction absorbs energy, which causes the core to collapse. This implosion transforms massive stars into a supernova while smaller stars like the sun contract into white dwarfs.
How do you see protostars?
This results in the formation of a warm clump of molecules referred to as the Protostar. The creation of Protostars can be seen through infrared vision as the Protostars are warmer than other materials in the molecular cloud.
What determines how a star will shine?
Stars come in a variety of masses and the mass determines how radiantly the star will shine and how it dies. 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, ...
How long do red dwarf stars burn?
These red dwarves are difficult to spot. But, these may be the most common stars that can burn for trillions of years. The above were the seven main stages of the life cycle of a star. Whether big or small, young or old, stars are one of the most beautiful and lyrical objects in all of creation.
What is the second step in the star-gas-star cycle?
interstellar gas clouds that fill the galactic disk, second step to star-gas-star cycle
What is interstellar gas?
gas composed mainly of hydrogen atoms, though in space it is generally mixed with helium and small amounts of other elements as well; most common form of interstellar gas, the result of cooling bubbles, slow cooling and contracting process
What is a glowing, expanding could of debris from a supernova explosion?
a glowing, expanding could of debris from a supernova explosion, it compresses, heats, and ionizes all the interstellar gas it encounters
How are interstellar bubbles formed?
Giant Interstellar bubble, formed when the shock waves of many individual bubbles merge to form a single giant shock wave
Where do molecular clouds settle?
molecular clouds settle towards central layers of Milky Way disk
What is a supernova shell?
an expanding shell of hot, ionized gas driven by stellar winds or supernova with very hot and very low density gas inside
What do galaxies look like?
galaxies that look like flat white disks with yellow bulges at their centers. Disks filled with cool gas, and usually with spiral arms
