Question

how are stars formed?(astronomy)

Answer 1

According to our current knowledge, planets are formed around a new star by condensing in a disc of molecular gas and dust, embedded within a larger molecular cloud. Condensation increases until they become giant planets, which are heated, then cleanse their orbits in the disc and possibly bend it.

Stars are formed from massive clouds of dust and gas in space. Gravity pulls the dust and gas together to form a protostar. As the gases come together, they get hot. A star forms when it is hot enough for nuclear reactions to start. This releases energy, and keeps the star hot.

The evolution of star is governed by two competing forces -- gravity pushing in and pressure from fusion pushing out. If gravity wins, the star collapses, if pressure wins, the star expands. ... In less massive stars, like the Sun, the star will collapse a bit, start fusing helium and become a much larger Red Gaint .

The evolution of star is governed by two competing forces -- gravity pushing in and pressure from fusion pushing out. If gravity wins, the star collapses, if pressure wins, the star expands. ... In less massive stars, like the Sun, the star will collapse a bit, start fusing helium and become a much larger Red Gaint .

Most stars take millions of years to die. When a star like the Sun has burned all of its hydrogen fuel, it expands to become a red giant. After puffing off its outer layers, the star collapses to form a very dense white dwarf.

supernova is called star death.

When a high-mass star has no hydrogen left to burn, it expands and becomes a red supergiant. While most stars quietly fade away, the supergiants destroy themselves in a huge explosion, called a supernova. The death of massive stars can trigger the birth of other stars.

One of the stars, a carbon-oxygen white dwarf, steals matter from its companion star. Eventually, the white dwarf accumulates too much matter. Having too much matter causes the star to explode, resulting in a supernova. ... As the star runs out of nuclear fuel, some of its mass flows into its core.

The stars move along with fantastic speeds, but they are so far away that it takes a long time for their motion to be visible to us. You can understand this by moving your finger in front of your eyes. Even when you move it very slowly, it may appear to move faster than a speeding jet that is many miles away.

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Answer 2

Answer:

Stars are born when large gas clouds collapse under gravity. They form hot cores that gather more and more gas and dust until a protostar is formed. If only a small amount of gas is around, then only a small star will form; if a large amount of gas is present, then a massive star will form.