By Iain Nicolson
ISBN-10: 0684136406
ISBN-13: 9780684136400
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Extra resources for Simple Astronomy
Sample text
Saturn and its of ring system ING A SSINI DIVISION THE OUTERMOST PLANETS PLUTO URANUS, discovered telescopically in 1781 by William Herschel, is a giant planet similar in general constitution to Jupiter but with a temperature of — 190°C. ) and it takes 84 years to complete an orbit. ) and it rotates in 10 hours 48 minutes. A curious feature is that its axis is inclined at 98 degrees, so it sometimes moves along pole first. Uranus has five moons, all of them smaller than ours. Uranus and was discovered in 1846 very close to the position predicted by the mathematician J.
Near the horizon is the bright red star Antares, in Scorpio (the Scorpion), while high in the south-west is Arcturus, above which is the beautiful little constellation Corona Borealis. In the northern sky, the Plough is pointing downwards, and Capella is low on the horizon. Andromeda and Pegasus are rising in the north-east, while Cepheus lies between Cassiopeia and Cygnus. Looking southwards in autumn, the four stars which make up the distinctive "square" of Pegasus are high in the sky with Andromeda above and to the left.
If the galaxies are expanding away from each other they must have been closer together in the past, and if we go enough back in time they must have been clumped tightly together. Hubble's Constant suggests that this time was about 10,000 million years ago. Cosmology concerns itself with theories of the nature of the universe, and one of these, the Big-Bang theory, suggests that about 10,000 million years ago all the material in the universe was lumped together at incredible density, then exploded, forming a rapidly expanding fireball.
Simple Astronomy by Iain Nicolson
by Robert
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