下面以米为单位图示10的n次幂
下面以米为单位图示10的n次幂
1025 A1 billion light-years Most of space looks as empty as this, the glow of distant galaxies like dotted dust. This emptiness is normal; our own bright home-world is the exception. A tenfold larger view would show no new structure, no new void; the universe is roughly uniform at such di. mensions. Novelty on so grand a scale is to be sought over time rather than from place to place. All swift change is in the past. This view will dim slowly, for a few billion years at least, as the faint dusters drift still farther apart
102e Welook toward our distant home in the Milky Way. But wesee mostly one large intervening ster of galaxies, called the Virgo Cluster. Galaxies as a rule associate into orbiting c to Irs there beyond the Milky Way is a good-sized volume nearly devoid of noticeable galaxies
1023 M10 million light-years These are the galaxies of our own cosmic region, cach single bright spot made by the summed light of stars by the billion. Their mutual gravity binds stars into galaxies, every one a complex swarm of moving star
102 c1 million light-years in space with two satellite galaxies, the irregular lidle Clouds of Magellan. Not many galaxies are larger than ours; nor are many seen that are smaller than the Clouds