George-6th period
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- A protostar is a contracting mass of gas.
- 2. As the nebula gathers more and more mass their gravitational pull increases, forcing more atoms together. This process is known as accretion, and the result is a protostar.
- 1. When a nebula , which is a enormous cloud of dust and gas,collects enough mass it begins to collapse under its own gravity. when nuclear fusion begins a star is created.
- 3. A protostar becomes a high mass main sequence star when its core temperature exceeds 10 million K.
- 4. Next, super giants develop. They develop when massive main-sequence stars run out of hydrogen in their cores. At this point they start to expand,
- 5. When stars run out of hydrogen to fuse in their cores, stars above about 10 times the mass of the Sun become super giants and then undergo a supernova. The explosion is very bright and powerful.
- Supernova!
- 6. When the core collapses, the blast wave slams into the dense material above, which thwarts the explosion. Instead of creating a supernova, the star implodes, forming a black hole.
- 7. If a star doesn't turn into a black hole, the ultra-dense remnants of the imploding core which are left behind are known as a neutron star, as its electrons and protons are crushed together in the huge gravity to form neutrons.
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