NASA news briefings, live commentary and updates before and after the scheduled Sunday, May 25 arrival of the agency's Phoenix Mars Lander will be available on NASA Television and on the Web.

New observations from NASA's Mars Reconnaissance Orbiter indicate that the crust and upper mantle of Mars are stiffer and colder than previously thought.

A new NASA-led study shows human-caused climate change has made an impact on a wide range of Earth's natural systems, including permafrost thawing, plants blooming earlier across Europe and lakes declining in productivity in Africa.

The most recent supernova in our galaxy has been discovered by tracking the rapid expansion of its remains, using NASA's Chandra X-ray Observatory and the National Radio Astronomy Observatory's Very Large Array.

NASA Deputy Administrator Shana Dale announced Wednesday the launch of NASA Education TV, a partnership with the National Institute of Aerospace to produce new educational television programs for distribution on NASA Television and the Internet.

NASA and its international partners have assigned two crew members to the Expedition 20 International Space Station mission.

NASA will hold two media briefings on Tuesday, May 20, beginning at 11 a.m. EDT, on the international Ocean Surface Topography Mission (OSTM)/Jason-2, which is dedicated to monitoring sea-level rise and improving weather and climate forecasts.

NASA's Aeronautics Research Mission Directorate has selected the winners of its high school contest to describe the passenger and cargo aircraft of the future.

The 2007 NASA Government Invention of the Year is a heat shield material slightly more dense than balsa wood that is designed to protect spacecraft during their fiery re-entry into Earth's atmosphere.

NASA's Phoenix Mars Lander is preparing to end its long journey and begin a three-month mission to taste and sniff fistfuls of Martian soil and buried ice. The lander is scheduled to touch down on the Red Planet May 25.