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Searching for life oxygen in the atmosphere of another planet, it could indicate
the presence of life forms. It is possible to detect oxygen and
other gases by studying the light reflected from other planets.
We could send robot spacecraft to explore other planets or
moons in the solar system…

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Big Bang evidence

Our sun contains helium. We know this because there are
black lines in the spectrum of the light from the sun where
helium has absorbed light. These lines form the absorption
spectrum for helium.

When we look at the spectrum of a distant star, the absorption…


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