What is a stellar nebula and how did it form?

What is a stellar nebula and how did it form?

In essence, a nebula is formed when portions of the interstellar medium undergo gravitational collapse. Mutual gravitational attraction causes matter to clump together, forming regions of greater and greater density.

Are stars born in stellar nebula?

Stars are born in giant, cold clouds of gas and dust called nebulae. A star is born once it becomes hot enough for fusion reactions to take place at its core. Stars spend most of their lives as main sequence stars fusing hydrogen to helium in their centres.

How long does it take for a stellar nebula to become a star?

about 10 millions years
The cores are denser than the outer cloud, so they collapse first. As the cores collapse they fragment into clumps around 0.1 parsecs in size and 10 to 50 solar masses in mass. These clumps then form into protostars and the whole process takes about 10 millions years.

What does the stellar nebula do?

There are many different kinds, but stellar nebulae are the clouds that form new stars. Inside stellar nebulae, space dust, hydrogen, helium and plasma swirl around and stick together and form into large blobs. These blobs eventually collapse and the stuff inside begins to heat up.

How do a star born?

A star is born when atoms of light elements are squeezed under enough pressure for their nuclei to undergo fusion. And once the fusion reactions begin, they exert an outward pressure. As long as the inward force of gravity and the outward force generated by the fusion reactions are equal, the star remains stable.

How are stars formed Wikipedia?

Interstellar clouds This medium has been chemically enriched by trace amounts of heavier elements that were produced and ejected from stars via the fusion of helium as they passed beyond the end of their main sequence lifetime.

What are the stages in the formation of a star from a nebula?

Stage 1- Stars are born in a region of high density Nebula, and condenses into a huge globule of gas and dust and contracts under its own gravity. This image shows the Orion Nebula or M42 . Stage 2 – A region of condensing matter will begin to heat up and start to glow forming Protostars.

How does a star work?

It lives in the Milky Way Galaxy, along with approximately 400 billion other stars. They all work by the same basic principle: they fuse atoms in their cores to make heat and light. For the Sun, this means that atoms of hydrogen are slammed together under high heat and pressure. The result is a helium atom.

What is a massive star made up of?

In a massive star, hydrogen fusion in the core is followed by several other fusion reactions involving heavier elements. Just before it exhausts all sources of energy, a massive star has an iron core surrounded by shells of silicon, sulfur, oxygen, neon, carbon, helium, and hydrogen.