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Get Astronomy: The Universe, Equipment, Stars and Planets, PDF

By Ian Ridpath, Carole Stott, Giles Sparrow

ISBN-10: 0756617332

ISBN-13: 9780756617332

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Read or Download Astronomy: The Universe, Equipment, Stars and Planets, Monthly Guides (Eyewitness Companions Guides) PDF

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Additional info for Astronomy: The Universe, Equipment, Stars and Planets, Monthly Guides (Eyewitness Companions Guides)

Sample text

The pressure of Omega Nebula (M17) Sagittarius strong stellar winds of charged particles star-forming nebulae Some of the sky’s outstanding emission nebulae are listed below. Since star formation is associated with our galaxy’s spiral arms, it is unsurprising that the finest star-forming nebulae are scattered along the length of the Milky Way.

Most protostars with more than about 10 percent of the Sun’s mass will eventually reach the main sequence, but a significant number with less mass will peter out as dim brown dwarfs. Stars forming today are likely to contain material from earlier generations of stars, enriched with heavier elements. The most massive stars form the heaviest elements and detonate in supernova explosions that scatter them across the galaxy. Protostars Collapsing protostellar clouds inside star-forming nebulae form cocoons—knots of gas and dust in which stars develop.

Routine spaceflight Soviet success The Mir space station used a “modular” design— new elements such as extra laboratories were added throughout its lifetime. The same idea has been applied to the International Space Station. The US space agency, NASA, was increasingly focused on developing the Space Shuttle—a “spaceplane” launched with the aid of a massive external fuel tank and two rocket boosters. The system was largely reusable, and it was expected to cut the costs of reaching shuttl es and stati ons 31 orbit dramatically.

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Astronomy: The Universe, Equipment, Stars and Planets, Monthly Guides (Eyewitness Companions Guides) by Ian Ridpath, Carole Stott, Giles Sparrow


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