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. The second satellite then snapped fascinating pictures of the Sun's corona, the outermost part of our star's atmosphere, something that's conventionally only possible during a solar eclipse. The first satellite's 4.6-feet-across disc cast a three-inch shadow onto the Association of Spacecraft […]