What is gravity
Force of attraction between masses
What is weight
Force of gravity on an object
What is the formula for weight
W equals m times g
What is gravitational potential energy
Energy stored due to height
What is the formula for gravitational potential energy
GPE equals m times g times h
What is a light year
Distance light travels in one year
What is the speed of light
Three times ten to the power eight meters per second
What is a nebula
Cloud of gas and dust
What is a protostar
Early stage of star formation
What makes a star shine
Nuclear fusion
What is nuclear fusion
Joining of small nuclei to release energy
What determines star life cycle
Initial mass
What is a red giant
Large cool star after hydrogen runs out
What is a supernova
Explosion of a massive star
What can form after a supernova
Neutron star or black hole
What is a black hole
Region where gravity prevents light escape
What is the Big Bang theory
Universe began hot dense and expanding
What is redshift
Increase in wavelength showing expansion of universe
