And every now and then a physicist comes along who forever changes our perception of the Universe and everything in it.

Here are 20 physicists whose theories, ideas, and discoveries revolutionised the way we see the world.

Launched in 1998, NASA Space Place's mission is to inspire and enrich upper-elementary-aged kids' learning of space and Earth science online through fun games, hands-on activities, informative articles and engaging short videos. With material in both English and Spanish and resources for parents and teachers, NASA Space Place has something for everyone.