Extending above the visible surface of the Sun , the faint, tenuous solar corona can't be easily seen from Earth, but it is measured to be hundreds of times hotter than the photosphere itself. What makes the solar corona so hot? Astronomers have long sought the source of the corona's heat in magnetic fields which loft monstrous loops of solar plasma above the photosphere.
John Glenn said Monday the Obama administration should keep the space shuttle flying until a replacement craft is developed.
Today, our sun reaches its northernmost point in planet Earth's sky. Called a solstice, the date traditionally marks a change of seasons - from spring to summer in Earth's Northern Hemisphere and from fall to winter in Earth's Southern Hemisphere. In this image from 2007, NASA's Solar Terrestrial Relations Observatory satellites provided the first three-dimensional images of the sun. STEREO, a two-year mission that launched October 2006, provided a unique and revolutionary view of the Sun-Earth System.
Space junk has NASA keeping a close eye on the International Space Station. New residents arrived Thursday.
Human spaceflight: The House Science and Technology Committee has given NASA Administrator Charles Bolden until June 25 to deliver all records pertaining to the agency's 2011 budget proposal, which abandoned the Constellation program, whose goal was to send astronauts back to the Moon and possibly to Mars.
Amelia Earhat's watch, which the famed aviator wore on two trans-Atlantic flights was brought aboard the International Space Station 82 years to the day after her first flight.
The thin line of Earth's atmosphere and the setting sun are featured in this image photographed by the crew of the International Space Station in November 2009.
A Russian Soyuz spacecraft linked up with the International Space Station Thursday with two American astronauts and a Russian cosmonaut aboard. The arrival boosted the space station's crew back up to full strength, with six people now living at the orbiting lab.
Theory of Everything: In an attempt to reconcile quantum mechanics with general relativity, scientists dropped super-cold quantum gas down a five-story shaft.
A meteor storm predicted for next year could imperil satellites and the space station, say NASA experts.