SciShow explains the science of detecting exoplanets -- planets in orbit around distant stars -- and how a new observatory being built in California may open up whole new worlds to us, literally!

As far as science and technology goes, the 21st century is an exciting time to be alive. We are curing more and more diseases. We are developing better and better space travel. Some see these advances as evidence that religion and magic...

Once it was determined that the Earth is round, the next step was to decipher the geometry of the solar system. Does everything rotate around the Earth, like in the geocentric model of Ptolemy? We thought so for thousands of years, but...