Edexcel IGCSE Physics Unit 8 – Astrophysics Complete Guide
1. Universe - Defined as an immense collection of billions of galaxies.
2. Galaxy - Refers to a large grouping of stars, often along with gas and dust, held together by gravitational
forces.
3. Milky Way - Specifically, it's the g...
- Defined as an immense collection of billions of galaxies.
2. Galaxy
- Refers to a large grouping of stars, often along with gas and dust, held together by gravitational
forces.
3. Milky Way
- Specifically, it's the galaxy that contains our solar system, including Earth and the Sun.
4. Solar System
- Describes the entirety of celestial bodies orbiting around the Sun, encompassing planets, dwarf
planets, asteroids, and comets.
, 5. Planet
- A significant celestial body that orbits a star, typically in an almost circular orbit with a slight elliptical
shape.
6. Planets in our Solar System (from closest to the Sun)
- Listed as Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
7. Dwarf Planet
- Designates an object similar to a planet but smaller in size and not meeting all criteria to be classified
as a full planet.
8. Moon
- A natural satellite that orbits a planet in a nearly circular path.
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