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By Ian Ridpath, Carole Stott, Giles Sparrow

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

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Cold death In the "Big Chill" scenario, all galaxies will merge to form giant ellipticals like NGC 1316 (left). Star formation will end, and eventually the last stars will go out. Over trillions of years, even the matter within them will disintegrate. ” The discovery of dark energy seems to have ruled out a Big Crunch, but has opened up two new possibilities. The four possible scenarios are shown here. Big Rip Big Crunch the big crunch In a Big Crunch scenario, the Big Crunch universe’s gravity is stronger than contracting the force imparted by the Big Bang, universe heats up so expansion slows to a halt and reverses.

Gathering data The stars are unimaginably distant from Earth—only the Sun is close enough to study in detail. Even through the largest telescopes, other stars appear as mere hot, bright blue star intermediate white star cool, bright red giant colorful starfields The rich starfields visible in the constellation Sagittarius, toward the center of our own Milky Way galaxy, reveal almost every variety of star, from dim dwarfs to bright giants, and from hot blue stars to cool red ones. points of light.

Cold death In the "Big Chill" scenario, all galaxies will merge to form giant ellipticals like NGC 1316 (left). Star formation will end, and eventually the last stars will go out. Over trillions of years, even the matter within them will disintegrate. ” The discovery of dark energy seems to have ruled out a Big Crunch, but has opened up two new possibilities. The four possible scenarios are shown here. Big Rip Big Crunch the big crunch In a Big Crunch scenario, the Big Crunch universe’s gravity is stronger than contracting the force imparted by the Big Bang, universe heats up so expansion slows to a halt and reverses.

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