This full-disk multi-wavelength extreme ultraviolet image of the sun taken by the Solar Dynamics Observatory (SDO) on March 30, 2010. False colors trace different gas temperatures. Reds are relatively cool at 107,540 degrees Fahrenheit; blues and greens are hotter at 1,799,540 degrees Fahrenheit.
Astronaut Philippe Perrin, STS-111 mission specialist, wears a training version of the Extravehicular Mobility Unit space suit during an underwater simulation of extravehicular activity. Perrin, representing CNES, the French Space Agency, was joined by astronaut Franklin R. Chang-Diaz (out of frame) for the simulation, conducted in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center.
NASA's Spitzer Space Telescope has captured a glowing stellar nursery within a dark globule that is opaque at visible light. These new images pierce through the obscuration to reveal the birth of new protostars and young stars never before seen. The newborn stars form in the dense gas because of compression by the wind and radiation from a nearby massive star. The winds from this unseen star are also responsible for producing the spectacular filamentary appearance of the globule itself, which resembles that of a flying dragon.
This artist's concept shows a view across a mysterious disk of young, blue stars encircling a supermassive black hole at the core of the neighboring Andromeda Galaxy. The region around the black hole is barely visible at the center of the disk. The background stars are the typical older, redder population of stars that inhabit the cores of most galaxies.
US President Obama greets schoolchildren following his second annual back-to-school speech at Julia R. Masterman Laboratory and Demonstration School in Philadelphia, September 14.
The tip of the Boeing Delta II rocket with its MESSENGER spacecraft on top breaks through the billows of smoke below as it lifts off on Aug. 3, 2004 from Launch Pad 17-B at Cape Canaveral Air Force Station. MESSENGER (Mercury Surface, Space Environment, Geochemistry and Ranging) is on a seven-year journey to the planet Mercury. The spacecraft will fly by Earth, Venus, and Mercury several times to burn off energy before making its final approach to the inner planet on March 18, 2011.
This NASA Hubble Space Telescope image captures the tempestuous stellar nursery called the Carina Nebula, located 7,500 light-years away from Earth in the southern constellation Carina.
Astronaut Stephen K. Robinson, STS-114 mission specialist, anchored to a foot restraint on the International Space Station's Canadarm2, participates in the mission's third session of extravehicular activity on August 3, 2005.
Like a sun on a fast rise, Space Shuttle Atlantis arcs into the still-black sky over the Atlantic Ocean, casting a fiery glow on its way. With a crew of five it is heading on the 10th assembly flight to the International Space Station. The primary payload on the mission is the joint airlock module, which will require two spacewalks to attach it to the Space Station. The airlock will be the primary path for Space Station spacewalk entry and departure for US spacesuits, and will also support the Russian Orlan spacesuit for EVA activity.