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Everything that exists. All physical matter and energy and the contents of the space between galaxies.
Everything that exists. All physical matter and energy and the contents of the space between galaxies. The Universe was formed in the Big Bang, around 14 billion years ago. Some very basic aspects of the Universe remain unexplained. It is expanding at an increasing rate, and most of the mass of the Universe is something we cannot see, dark matter.
The Universe was formed in the Big Bang, around 14 billion years ago. Some very basic aspects of the Universe remain unexplained. It is expanding at an increasing rate, and most of the mass of the Universe is something we cannot see, dark matter.