Rosetta space probe successfully crash lands on comet after 4 billion mile trip

Rosetta, the comet-chasing space probe, has successfully crash landed on the space rock it has been studying. In the past decade, the spacecraft has traveled 4 billion miles. Rosetta has helped scientists shed light on the beginnings of the universe, and some experts say this is the most successful mission ever attempted by the European Space Agency.Sept. 30, 2016