NASA

Acquired April 5 and 20, these images compare conditions along the Mississippi and Illinois Rivers, where flooding struck in the spring of 2013.

Acquired April 16, 2013, these images show multiple dust plumes over the Four Corners region.

Thermal infrared imagery of the Southern California desert picks up the invisible water in the farmland around the Salton Sea.

Astronomers trace water in Jupiter's intermediate atmospheric layer back to the famous Shoemaker-Levy 9 comet impact of 19 years ago.

Astronomers have spotted the most efficient maker of stars yet, a galaxy undergoing a rare phase of evolution.

Acquired April 5 and 20, 2013, these images compare conditions along parts of the Mississippi and Illinois Rivers, where flooding struck in the spring of 2013.

The smaller Arabian plate plunges beneath the Eurasian plate where the two collide in the Middle East. As the Eurasian plate descends, quakes can occur deep below the surface.

While its current form is that of a youthful stratovolcano, the regional geological evidence indicates that Bolivia’s Tata Sabaya has an older, eventful history.

As the world celebrates Earth Day 2013, a NASA airborne campaign is busy studying California's ecosystems in a whole new light in preparation for a future satellite mission.

Acquired April 14, 2013, this image shows Tropical Cyclone Imelda near Mauritius and Réunion.

Astronomers have used NASA's Hubble Space Telescope to photograph the iconic Horsehead Nebula in a new, infrared light to mark the 23rd anniversary of the famous observatory's launch aboard the space shuttle Discovery on April 24, 1990.

Journalists are invited to attend an Earth Day visit by NASA Deputy Administrator Lori Garver to the agency's Goddard Space Flight Center in Greenbelt, Md., from 10 - 11:15 a.m. EDT on Monday, April 22.

NASA's Kepler mission has discovered two new planetary systems that include three super-Earth-size planets in the "habitable zone."

On a new list of the 100 most influential people on Earth, three work at the same California address, where they've led projects to study things that are not on Earth.

NASA's Kepler mission has discovered two new planetary systems that include three super-Earth-size planets in the "habitable zone," the range of distance from a star where the surface temperature of an orbiting planet might be suitable for liquid water.

Two NASA spacecraft orbiting Mars, both working long past their original prime missions, have new project managers at NASA's Jet Propulsion Laboratory, Pasadena, Calif.

Busy-bee galaxy seen churning out stars when our universe was just a baby.

The smaller Arabian plate plunges beneath the Eurasian plate where the two collide in the Middle East. As the Eurasian plate descends, quakes can occur deep below the surface.