What does an artificial eclipse look like? One space agency's satellites recently accomplished this task as part of a mission to study the sun's corona.

Two satellites just carefully lined up to form a perfect "artificial total solar eclipse" in orbit. Earlier this year, the two probes, which are part of the European Space Agency's Proba-3 mission, positioned themselves in a perfect line 492 feet apart — accurate down to a single millimeter — to have one of them perfectly obfuscate the Sun's rays.