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REVISION NOTES: PHYSICS 3
SPACE



Introduction to Galaxies

Around 13 billion years ago, the Universe was created by the Big Bang. The Big Bang created
space, radiation and time, and at first, our Universe was just a hot glowing ball of radiation and
matter ­ but as it expanded, its…

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REVISION NOTES: PHYSICS 3
SPACE



released in this process, causing the core to get hotter, bigger and brighter and eventually it begins to
shine ­ a star has been born.
Due to hydrogen fusion in the core, stars (including the Sun) radiate energy. This is the main part of
a…

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REVISION NOTES: PHYSICS 3
SPACE




There is a galaxy called the M87 Galaxy which spins so fast at its centre that it is thought to contain
a black hole with a mass more than one billion times as heavy as our Sun.


















Formation of Chemical Elements in Space

The life…

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REVISION NOTES: PHYSICS 3
SPACE




Heavy elements only form when the big stars collapse and explode as supernova. This happens
because the immense pressure of the collapsing causes smaller nuclei to fuse into larger nuclei ­ but
this time larger than iron. The explosion scatters the star into space, and…

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