Astronomy - Planets, Stars and the Cosmos by Heather Couper;Nigel Henbest

By Heather Couper;Nigel Henbest

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Extra resources for Astronomy - Planets, Stars and the Cosmos

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Our position in the Galaxy own (shown by a cross, right) We all some 10,000 light years from special. live the center, in or near a spiral arm. 34 is not at Position of our -L Sun in the Galaxy . •« » . • •« • '. vT> . • Other Galaxies Beyond our Galaxy, separated from us by vast tracts of empty space, lie billions of other galaxies. Astronomers have to use powerful telescopes to see them. A few are visible to the unaided eye, like the Andromeda Galaxy. It looks like a twin of the Milky Way, but is The Andromeda Galaxy nearly half as and over 2 million light years away.

This outflow prevents any further collapse, while the surrounding dust shell is blown away. In some cases, billions of dust grains will have stuck together to form an encircling system of planets. The energy of a star The energy produced by fusion in a hydrogen bomb explosion would fuel a star only the smallest fraction of a second. for The energy generated inside a star's core by the same fusion process begins as powerful penetrating and gamma rays), and finally escapes into space as less harmful light and heat coming from the star's radiation (X rays photosphere.

A core of iron nuclei. However, when it tries to needs to this can only come from a supernova fuse iron, it actually take m energy, explosion the core (4). 3 miles) across. heavy star may a black hole (6), km A really leave behind so collapsed that not even escapes its massive light A black hole, the end of a huge star gravitational pull. 33 we see are just a tiny fraction of the 100 billion members of our local star system, the Milky Way Galaxy. The Milky Way is a flat disk-shaped star-island 100,000 light years in diameter.

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