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Supernova
Beginning of paper
A is a STAR that explodes. It suddenly increases in
brightness by a factor of many billions, and within a few weeks it slowly
fades. In terms of the human lifespan, such explosions are rare occurrences.
In our Milky Way galaxy, for example, a may be observed every few
hundred years. Three such explosions are recorded in history: in 1054, in
1572 ....
Middle of paper
....stars of small mass, whereas type II occurs among
very young stars of large mass. It is not known how a small-mass star can
release the very large amounts of energy needed to explain type I
supernovas. Scientists generally believe that this must involve binary
systems--two stars revolving around each other. In such a system one of the
stars is a WH.... |
| Word count: 696 |
Page count: 3 |
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