By Heather Couper;Nigel Henbest
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Extra resources for Astronomy - Planets, Stars and the Cosmos
These are probably young galaxies still collapsing from huge gas clouds, which are dominated by a colossal black hole. Its gravity swirls mfallmg gases around at speeds close to that of These swirling gases generate energy and eject light. jets of matter. 36 ^^ ^ Barred spiral Every galaxy in the Universe is moving away from every At the instant of the Big Bang - the start of the expansion - violent outbursts as the infall other galaxy. The Universe the Universe must have of gas slowly been unimaginably dense and hot.
Gravity squeezes the core, heating star's up, causing the outer layers to billow outward down it (2). It then settles temporarily as a huge red giant (3) - perhaps having swallowed a planet or two in the process. Gravity has only a weak hold on the star's outer layers, which gently drift off into space, and we see the core of the old star and its gas shell as a "planetary nebula" As (4). the shell disperses, the core remains as a superdense, collapsed white dwarf star (5) which has no fuel and eventually cools dark cinder by 32 (6), still to a circled White dwarf and attendant planets its frozen planets.
So again, a separate South polar star chart is created to p australe 1 / y Crux The 270° Triangulum 135°\ J^ \ / qIo Cehtaurus/225 show these Southern stars best. 180° The Southern polar chart 29 e Lives of Star: long an averlife, but then they will eventually die. Our Sun age star - has lived for 5 billion years already and still has about 5 billion years to go. But we can see other stars at different stages of their development, and so we can Stars are not unchanging; they are born, will live a piece together the story of a star's lifetime.
Astronomy - Planets, Stars and the Cosmos by Heather Couper;Nigel Henbest