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Life cycle of a star

stages of the life cycle of a star

Devin Norman

on 3 December 2012

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Transcript of Life cycle of a star

by Devin Norman Life Cycle of a Star Phase 1: Nebula Phase 2: Protostars Phase 3: Main Sequence Star Phase 5: Red Supergiant Phase 4: Red giant Phase 6: SUPERNOVA Final Stage: Neutron Star or Black Hole Stars are born from nebluas. Some of the dust from the neblua compacts a forms newly born stars. 60% of all of the nebulas in the universe are planetary nebulas. This is the second stage of the life cycle. These stars are in the baby-kid part of the life cycle. It takes a couple hundred years before it grows up to the "teenager"stage. Around this stage is when nuclear fusion in the core activates. The fusion causes the star to increase in mass as it gets older. As the years go by it grows to the adult stage: Red giant. This stage has the major split in the life cycle of a star. If a red giant has a lower than normal mass the outer layers blow away to make a planetary nebula. The core is left and shines as a white dwarf. As millions of years go by it starts to dim to a brown dwarf. Then quietly dim out to a black dwarf. If the mass is bigger it forms a Red Supergiant. The star is very unstable at this stage. The mass in this star grows rapidly over thousands of years. It then can't use fusion to make any more energy so the star gives off blue light and its core starts to "burn" out the inner layers of the star. This makes the star to cave in on its core. With this massive amount of energy in the core, it self-destructs. This is far by the most explosive stage in a star's life. The star can't hold much pressure so it implodes and blows up with a shock wave. During a supernova the star is as bright as 100,000 suns! This is considered the death stage. If the left over star is less than 3 solar masses it becomes an neutron star that pulses energy into space until it fuzzles out. If it is bigger than 3 solar masses its core collapes in an inward sucking motion. It forms a black hole that would suck in everything. Nothing, not even light can't escape.
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