General Theory of Relativity

What would happen if you were to place a bowling ball on top of a nice fluffy pillow? The mass of the bowling ball would cause the pillow to bend or sink. Space bends the same way. Space surrounds everything—the planets, stars, and even you! Einstein's General Theory of Relativity proved that when an object has mass, it bends the space around it. You are bending space right now!

Image credits: main image, © AMNH/Eric Hamilton.