Ancient Lake in the Gale Crater on Mars?
December 10, 2013 | NASA
"This illustration depicts a concept for the possible extent of an ancient lake inside Gale Crater. The existence of a lake there billions of years ago was confirmed from examination of mudstone in the crater's Yellowknife Bay area."
Flows of Water on Mars?
March 6, 2014 | NASA
"NASA spacecraft orbiting Mars have returned clues for understanding seasonal features that are the strongest indication of possible liquid water that may exist today on the Red Planet." Quoted from the NASA press release.
Related: Rocks on Mars
Plankton Bloom in Lake Ontario
September 2, 2013 | NASA Earth Observatory
"This photograph taken by an astronaut on the International Space Station highlights a late summer plankton bloom across much of Lake Ontario, one of North America’s Great Lakes. Microscopic cyanobacteria, or blue-green algae, can reach such large concentrations and color the water to such an extent that the change is visible from orbit." Quoted from the Earth Observatory website.