On April 20, 2010, an explosion aboard the semi-submersible oil platform Deepwater Horizon started a massive oil spill caused by a sea-floor gusher that released an estimated 53,000 barrels per day (8,400 m3/d) of crude oil before it was capped. This picture from the Terra satellite shows sunlight reflecting off the oil (center) a little over one month after the explosion.Photo: NASA/GSFC, MODIS Rapid Response Team