All of AQA Space Physics explained in 9 minutes - GCSE Physics 9-1 REVISION

This video is a summary of all of AQA Space, explained for GCSE Physics 9-1. You can use this as an AQA Space revision tool.

Within the Universe, there are billions of galaxies, which contain billions of stars, many of which have orbiting planets, some of which have orbiting moons. Within our galaxy, the Milky Way, we have the Solar System. There are 8 planets that orbit the Sun, including ours (Earth), some of which have moons. There are four rocky planets: Mercury, Venus, Earth and Mars. And there are four gas giants: Jupiter, Saturn, Uranus and Neptune. Comets, asteroids, gas and dust also orbit the Sun.

The formation of stars: Within a nebula, gas and dust attract and start to form a dense, hot region called a protostar. This evolves into a main sequence star, then into a red giant, then a white dwarf and finally a black dwarf. If the protostar and main sequence star are massive enough, the star evolves into a red supergiant which will eventually explode in a supernova. What's left is a neutron star. And if the star is so massive that the neutron star cannot support itself, it will collapse into a black hole.

Gravity holds everything together, it causes stars to orbit black holes, planets to orbit stars and moons to orbit planets. It also is the reason why nuclear fusion occurs in stars.

The Universe is approximately 13.8 billion years and started with the Big Bang. Evidence for the Big Bang includes the cosmic microwave background radiation (CMBR) and the redshift of gamma rays. This suggests the Universe is expanding, hence it started as a point.

Thanks for watching,

Lewis

Relevant for GCSE Physics 9-1 in the following exam boards:
AQA (including Trilogy)

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