GCSE Physics Space Revision Notes

• 1The universe is expanding and contains billions of galaxies.
• 2Gravity is the force that keeps planets in orbit around stars.
• 3The life cycle of stars includes stages such as nebula, main sequence, and supernova.
• 4Planets in our solar system can be classified as terrestrial or gas giants.
• 5Black holes are regions in space where gravity is so strong that nothing can escape from them.

Space is the area beyond Earth's atmosphere where all the stars, planets, and galaxies exist. Everything in space is influenced by gravity, which pulls objects together. Stars are born from clouds of gas and dust, and they go through different stages in their life. Some stars end their lives as black holes, which are very powerful and can pull in anything that comes too close.