The Big Bang and Other Life Revision

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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 for signs of life. We might spot SETI
living things or their remains in photographs transmitted back Alien civilisations, which are capable of transmitting radio
to Earth. A robot spacecraft may be able to return samples to signals, may exist. The Search for Extra-Terrestrial
Earth for study. It may also be possible to send astronauts to Intelligence (SETI) is a programme that uses radio telescopes
these planets or moons to look for life forms, or their remains. to look for non-natural signals coming from space
The Big Bang
The galaxies appear to be moving away from each
The further away a galaxy is from us, the faster it is
This and other evidence suggests that the universe is
If the universe is expanding, it is likely to have been much
smaller in the past. The Big Bang Theory suggests that about
13.6 billion years ago, all the matter in the universe was
concentrated into a single incredibly tiny point. This began to
enlarge rapidly in a hot big bang and it is still expanding.
Image courtesy of NASA
Astronomers have detected a cosmic background radiation
Studying alien atmospheres that is thought to be the heat left over from the original
The Earth's atmosphere contains about 21 per cent oxygen as explosion.
a result of photosynthesis by plants. If we found evidence of

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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
spectrum is there, but the pattern of lines have moved
towards the red end of the spectrum. This is called red-shift.…read more


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