1.
Transfer of heat in a fluid.
2.
Heat source for convection on Earth.
3.
Movement of air due to convection.
4.
Movement of water in the ocean due to convection.
5.
Average weather conditions over a long period.
6.
Daily conditions of the air around us.
7.
Sphere of gases in space releasing energy due to nuclear fusion.
8.
Area of gas and dust in space where stars can form.
9.
Stage in a main sequence star's life when it starts running out of fuel for nuclear fusion.
10.
Last stage of a main sequence star's life.
11.
A huge collection of stars, dust, and gases held together by gravity.
12.
A giant explosion at the end of a massive star's life.
13.
The remnant of the largest stars after a supernova.
