初級
3-9/ The Universe 9/9
2018年2月11日 初級
Is the Universe getting bigger? Astronomers can measure the speed with which stars and galaxies are moving. Mo …
3-8/ The Universe 8/9
2018年2月11日 初級
Will the Universe come to an end? No one knows the answer to this question. Astronomers believe that the Unive …
3-7/ The Universe 7/9
2018年2月11日 初級
What is a light-year? Distances are so huge between the stars that astronomers do not use miles to measure the …
3-6/ The Universe 6/9
2018年2月10日 初級
How big is the Universe? No one knows for sure how big the Universe is. There may be parts of the Universe be …
3-5/ The Universe 5/9
2018年2月10日 初級
What holds the Universe together? The same force that keeps your feet on the ground holds the whole Universe t …
3-4/ The Universe 4/9
2018年2月9日 初級
Is the Earth at the center of the Universe? The Universe is everything that exists – all the planets, mo …
3-3/ The Universe 3/9
2018年2月6日 初級
Where does space begin? Space begins at the top of the atmosphere. As you go higher, the air gets thinner. At …
3-2/ The Universe 2/9
2018年2月5日 初級
What is space? Space is nothing – or almost nothing. It is the space that lies between the Earth and the …
3-1/ The Universe 1/9
2018年2月5日 初級
When did the Universe form? If the Universe is getting bigger, as astronomers believe, then it must have been …
