More galaxies exist in the universe than was once believed C. Galaxies occur in clusters throughout the universe D. Clusters are distributed uniformly throughout the universe 题目详解 题目讨论 免费查看解析 还没有账号?马上注册 隐藏原文 译文
Cygnus A is one of the most prominent examples of a radio galaxy, but other exceptional radio-loud supermassive black hole-powered galaxies exist in the universe. Centaurus A, also known as Caldwell 77 or NGC 5128, is located around 12 million light-years from Earth, making it one of the...
它们是地球独有的吗，还是可能也存在于其他环境之中，比如在太阳系的其他地方或者系外行星上？有机分子遍布整个宇宙。But the presence of the basic ingredients of life may not in itself be enough for life to exist. To go from the inert to the living may require a very specific combination of env...
A different galaxy might exist, but its light has not yet reached us. Galaxy Classifications A galaxy may be called an NGC or M number. What are they? French Astronomer Charles Messier first catalogued galaxies, Nebulas and star clusters. His first catalogue consisted of 45, published in ...
Astronomers count galaxies by training a telescope on a dark patch of sky for a long time. They tally the galaxies they can see and then figure out how many more might exist based on the limits of their telescope, Samuel explained. But this method is limited and incomplete, which means th...
The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 75 percent hydrogen. Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in ...
that resemble a pattern. Constellations are areas of the sky where we have broken the sky into parts. All the stars in the constellations are withinthe Milky Way. A galaxy is a large collection of stars containing billions or trillions of stars. Galaxies exist outside our own Milky Way ...
Webb is known for its ability to stare unblinking into the deep sky. Since it came online, it has produced deep-field images containing thousands of distinguishable galaxies and narrow profiles of individual stars—and its repertoire is still expanding. In June 2024, JWST astronomers presented the...
Stars exist in billions of galaxies across the universe. They are an important part of the evolution of the cosmos. They were the first objects to form more than 13 billion years ago, and they comprised the earliest galaxies. When they died, they transformed the early cosmos. That's because...
Different galaxies seem to contain different amounts of dark matter. In 2016, a team led by Van Dokkum found a galaxy calledDragonfly 44, which seems to be composed almost entirely of dark matter. On the other hand, since 2018 astronomers have found severalgalaxies that seem to lack dark ...