Explaining the Early Universe

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What is the Big Bang theory?
Astronomers are people who study celestial bodies, which are objects in space such as stars, the Moon, and planets. Advancements in technology have allowed astronomers to gather evidence about the universe and propose a theory about its origin.
What is the Big Bang theory?
According to the Big Bang theory, the universe and everything in it began in an event that took place about 13.7 billion years ago. Before this event, there was no matter of any kind- not even atoms, protons, or electrons.
What is the Big Bang theory?
According to the theory, the Big Bang event gave rise to all the energy and matter in the universe
What evidence supports the Big Bang theory?
The theory speculates that the universe must have started out very small, hot, and dense and has been expanding an cooling ever since. Evidence for the Big Bang theory includes the following:
What evidence supports the Big Bang theory?
Galaxies, which are collections of stars, are moving away from each other. In other words, the universe appears to be expanding.
What evidence supports the Big Bang theory?
There is background radiation, which is energy transmitted in waves that can be picked up from every part of space. This radiation was first detected in the 1960s by radio telescope and may be the remains of the radiation that was given off by the original Big Bang event.
What evidence supports the Big Bang theory?
Space probes have mapped the background radiation.
Why do scientists think that the universe is expanding?
A spectroscope is an instrument that can be separate white light into its wavelengths of colour.
What evidence supports the Big Bang theory?
If the star is moving away from you there is a red shift, which means its wavelengths get longer.
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