NATS 1880 Chapter Notes - Chapter Final: Atomic Nucleus, Copernican Principle, Red Dwarf
9 Dec 2014
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75% of all stars are m stars. Only 7% are stars like the sun. Less than 1% are the bright stars that you see in the night time. If you didn"t have an ozone layer life would only be able to develop under water. A and f stars only make up 3% of stars. M, g, k make up 90% of all stars. What is the smallest star possible? (least mass) 10% the mass of the sun is the smallest it could get. Brown dwarfs: stars smaller than 10% of the sun but with cores not hot enough for fusion (heavier than planets) M star is way fainter than the sun. A definition of planet is a body that primarily orbits a star, large enough that gravity makes it large in shape, it can"t be in an area full of debris. Direct detection: telescope or pictures, almost impossible.
