NASA's Curiosity rover is celebrating seven incredible years on Mars

Earlier this year, NASA was forced to finally say goodbye to the trust Opportunity rover. It was a sad time for the space agency since the rover had exceeded expectations in every imaginable way, but thankfully it's not the only rover on the Red Planet. Curiosity, which was launched back in 2011, is still alive and well, and today marks its seventh year of an already impressive campaign. The rover spent months cruising through space before eventually plummeting to the surface of Mars where it sa...