小教板-
THE BIG BANG One of the most persistently asked questions has been: How was the universe created? Many once believed that the universe had no beginning or end and was truly infinite. Through the inception of the Big Bang theory
however
no longer could the universe be considered infinite. The universe was forced to take on the properties of a finite phenomenon
possessing a history and a beginning. About 15 billion years ago a tremendous explosion started the expion of the universe. This explosion is known as the Big Bang. At the point of this event all of the matter and energy of space was contained at one point. What exisisted prior to this event is pletely unknown and is a matter of pure speculation. This occurance was not a conventional explosion but rather an event filling all of space with all of the particles of the embryonic universe rushing away from each other. The Big Bang actually consisted of an explosion of space within itself unlike an explosion of a bomb were fragments are thrown ouard. The galaxies were not all clumped together
but rather the Big Bang lay the foundations for the universe. The origin of the Big Bang theory can be credited to Edwin Hubble. Hubble made the observation that the universe is continuously expanding. He discovered that a galaxys velocity is proportional to its distance. Galaxies that are ice as far from us move ice as fast. Another consequence is that the universe is expanding in every direction. This observation me that it has taken every galaxy the same amount of time to move from a mon starting position to its current position. Just as the Big Bang provided for the foundation of the universe
Hubbles observations provided for the foundation of the Big Bang theory. Since the Big Bang
the universe has been continuously expanding and
thus
there has been more and more distance beeen clusters of galaxies. This phenomenon of galaxies moving farther away from each other is known as the red shift. As light from distant galaxies approach earth there is an increase of space beeen earth and the galaxy
which leads to wavelengths being stretched. In addition to the understanding of the velocity of galaxies emanating from a single point
there is further evidence for the Big Bang. In 1964
o astronomers
Arno Penzias and Robert Wilson
in an attempt to detect microwaves from outer space
inadvertently discovered a noise of extraterrestrial origin. The noise did not seem to emanate from one location but instead
it came from all directions at once. It became obvious that what they heard was radiation from the farthest reaches of the universe which had been left over from the Big Bang. This discovery of the radioactive aftermath of the initial explosion lent much credence to the Big Bang theory.
参考: umich.edu/~gs265/bigbang
THE BIG BANG One of the most persistently asked questions has been: How was the universe created? Many once believed that the universe had no beginning or end and was truly infinite. Through the inception of the Big Bang theory
however
no longer could the universe be considered infinite. The universe was forced to take on the properties of a finite phenomenon
possessing a history and a beginning. 【出售】Bigbang演唱会2017！安心出售！即上 Ticketbuynow
分享好知识！