Published on Aug 17, 2020

Universe Background Images

License Info: Creative Commons 4.0 BY-NC
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The universe is the name that we use to describe the collection of all the things that exist in space. It is made of many millions of millions of stars and planets and enormous clouds of gas separated by a gigantic empty space.

Astronomers can use telescopes to look at very distant galaxies. This is how they see what the universe looked like a long time ago. This is because the light from distant parts of the universe takes a very long time to reach us. From these observations, it seems the physical laws and constants of the universe have not changed.

Physicists are currently unsure if anything existed before the Big Bang. They are also unsure whether the size of the universe is infinite.

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The most used scientific model of the Universe is known as the Big bang theory. The Universe expanded from in which all the matter and energy of the Universe was concentrated. Several independent experimental measurements support the expansion of space and, more generally, the Big Bang idea. Recent observations support the idea that this expansion is happening because of. Most of the matter in the Universe may be in a form which cannot be detected by present methods. This has been named dark matter.

Just to be clear, dark matter and energy have not been detected directly (that is why they are called ‘dark’). Their existence is from observations which would be difficult to explain otherwise. According to space can get bigger faster than the speed of light, but we can view only part of the observable universe because of the speed of light. We cannot see space beyond the limitations of light (or any electromagnetic radiation) the diameter of the Universe is at least 93 billion.

It is estimated that the age of the Universe is 13.73 (± 0.12) billion years, and that the diameter of the Universe is at least 93 billion light years, or 8.80 ×1026 metres.

Universe Background images gallery for free download

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