To know how the Universe is expanding might be of little practical interest, though it is of utmost importance for our understanding of all cosmological interrelations. The Hubble parameter H 0 is the term that determines expansion. Usually, Einstein's equations are taken as a starting point, ...
Cosmologists(宇宙学家) can't agree on how fast the universeis expanding because the two methods they use to find out givedifferent results. Now a third method involving gravitational wavescould help break the deadlock.Gravitational waves are the waves in space-time whoseexistence was confirmed in...
Theoretically, an expanding universe must have started from a single point. => 从理论上说,一个膨胀的宇宙一定是从一个点开始的。 By measuring how fast the universe is expanding, astronomers calculated backwards and figured out when it burst into life. => 通过测量宇宙膨胀的速度,天文学家们计算出...
The concept of an expanding universe was advanced by the American astronomer Edwin Hubble (1889-1953), who is the namesake for the Hubble Space Telescope. In the early 20th century, Hubble became one of the first astronomers to deduce that the universe was composed of multiple galaxies. His s...
How Big is the Universe? The actual spatial size of the universe is unknown. However, by measuring the observable universe, the current size of the universe is approximately 95 billion light-years in diameter. Humanity once believed that the night sky was the unilluminated sphere that enclosed ...
This does not mean that Earth is at the center of the cosmos. Instead, the finding told scientists that the universe is expanding and that there is a direct relationship between how far apart two objects are and how fast they are receding from one another. The Hubble constant has a value...
但引力是把双刃剑 But gravity is a double-edged sword. 引力太大 早期的宇宙就不会 Too much, and the early universe would never have gotten 从起点脱离开 out of the starting blocks. 如果膨胀速度太慢 If it had been expanding more slowly, 宇宙就会重新坍塌 成为另一个奇点 it would have re-...
EYW - Expanding Your World. Looking for abbreviations of EYW? It is Expanding Your World. Expanding Your World listed as EYW
The Universe is expanding, but how quickly is it expanding? How far away is everything getting from everything else? And how do we know any of this anyway? When astronomers talk about the expansion of the Universe, they usually express it in terms of the Hubble parameter. First introduced...
Scientists have known for decades that the universe is expanding, but research in the past few years has shaken up calculations on the speed of growth—raising tricky questions about theories of the cosmos. The rate of expansion—known as the "Hubble constant"—is a central part of the quest...