| A | B |
|---|
| Big Bang Theory | Explains how the universe may have formed and explains the observation that the universe still seems to be expanding |
| Solar System | the Sun and everything that revolves around it including planets, comets and asteroids |
| Heliosphere | all space that is in anyway influenced by the Sun |
| Kuiper Belt | starts around Pluto and in thought to be source of comets that frequently orbit the Sun |
| Local Group | the collection of galaxies to which the Milky Way Galaxy belongs |
| Galaxy | the body to which our solar system is gravitationally bound -- we orbit it's gravitational centre |
| Singularity | an infinitely dense point from which our universe formed |
| Canadian Space Agency | Canadian government's Space research agency |
| Planet | a body that orbits the Sun, is spherical in shape due to having sufficient mass and which has cleared it's path |
| Dwarf Planet | Objects that seem planet-like but which do not meet all three requirements for being a planet |
