Theories of the origin of the Universe have had to take into account:
Red light has a wavelength than the other colours. This red shift is thought to be due to the effect. This is when waves are compressed together as the source moves towards you and spreads out as it moves away. The current way of explaining this is: that other galaxies are moving away from us very ; that the further away from us a galaxy is, the it is moving away from us. This suggests that the whole Universe is and that it might have started, billions of years ago, from one place with a huge explosion we call the . There are many unanswered questions to which cosmologists are searching for answers, for example the nature of that appears to make up much of the Universe’s mass.
The current way of explaining this is:
There are many unanswered questions to which cosmologists are searching for answers, for example the nature of that appears to make up much of the Universe’s mass.
