Key Words

The life cycle of a star:

  • Nebula - a cloud of dust and gas. Stars form from Nebulas.
  • Protostar - dust and gas pull together through the force of gravity to form a Protostar.
  • Main sequence star - the force of gravity pulls everything inwards. It's a stable period in a stars life (our sun).
  • Red Giant - the hydrogen begins to run out in a star and it swells.
  • Super Red Giant - a large star's hydrogen begins to run out and it swells.
  • White Dwarf - the hot dense solid core left by small-to-medium-sized stars when they become unstable and ejects its outer layer of dust and gas.
  • Black Dwarf - the White Dwarf cools and no longer emits a significant amount of energy.
  • Supernova - a big star that has exploded due to the fusion and constant expanding and contracting forming elements as heavy as iron in various nuclear reactions.
  • Neutron star - made from an exploding supernova. The outer layers of dust and gas has been thrown into space leaving a very dense core.
  • Black hole -  a super dense point in space that not even light can escape from made from an exploding supernova from a very big star.

The Solar System - all the things that orbit our sun (our closest star):

  • Planets - large objects that orbit the Sun (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune).
  • Dwarf planets - planet like objects that orbit the Sun but smaller than our main 8 planets.
  • Moons - a natural satellite that orbits the planets.
  • Artificial satellites - man made satellites that orbit the Earth.

Satellite - an object that orbits a second, more massive object

Orbit - the path one object in space takes around another.

Gravity - the force that creates orbits.

The Big Bang - the explosion that came from a very dense, very small space which caused space to start expanding and grow.

Red-shift - wavelengths that have shifted into the red end of the spectrum. It shows that the light from distant galaxies are moving away from us.

Dark matter - an unknown substance which holds galaxies together, but does not emit any electromagnetic radiation.


Also see Forces, Atomic Stucture

Physics Revision Buddy Shop

For even more products visit our full Physics Shop

[supsystic-gallery id=9]