What does gravity do?

What is gravity?

Who discovered Earth has gravity?

What is weight? what is mass?

How did gravity help shape the universe?

Could one big mass attract everything?

How does gravity make objects go into orbit?

How does gravity affect us on Earth?

How does the moon's gravity affect Earth?

How do astronauts cope with less gravity?

Do astronauts float or free-fall in space?

What is G-force?

Could gravity cause an object to hit Earth?

Galaxy quiz.