A ring-shaped nebula formed by an expanding shell of gas around an aging star. The leftover core eventually becomes a white dwarf.

• Supernova 
• Nebula 
• Planetary Nebula 
• Gravity 

A giant cloud of gas and dust, it is made mostly of Hydrogen and Helium.

• Supernova 
• Nebula 
• Planetary Nebula 
• Gravity 

A high mass star that eventually explodes.

• Nebula 
• Planetary Nebula 
• Supernova 
• Star 

A Negatively Charged subatomic particle that orbits around an atom.

• Electron 
• Neutron 
• Proton
• Atomic Nuclei, (Nucleus)

A subatomic particle that has no charge.

• Electron 
• Neutron 
• Proton
• Atomic Nuclei, (Nucleus)

A huge ball of gas held together by gravity. The central core is extremely hot and produces energy.

• Star
• Nebula 
• Mass
• Gravity 

A process in stars where two Hydrogen atoms combine to form Helium and release energy.

• Nebula 
• Nuclear Fusion 
• Supernova 
• Gravity 

A subatomic particle with a positive charge.

• Electron
• Neutron
• Proton
• Atomic Nuclei, (Nucleus)

A force which tries to pull two objects toward each other.

• Supernova 
• Nebula 
• Planetary Nebula 
• Gravity 

All low/medium mass stars will eventually 

• explode into a supernova
• become a black hole
• change into a white dwarf 
• become a neutron star