During the late afternoon of Oct. 23, 2014, a partial solar eclipse will be visible from much of North America before sundown. Partial eclipses occur when the moon blocks part of the sun from view.
Throughout history, total eclipses, in which the entire sun is blocked from view, have offered scientists the chance to see the faint light of the sun's atmosphere called the corona, without its being overwhelmed by the sun itself. Total eclipses provide views of that atmosphere, which we otherwi [...]
The Expedition 41 crew is wrapping up preparations before Wednesday’s six hour Russian spacewalk and cleaning up after two U.S. spacewalks earlier this month. The station residents also pressed ahead with ongoing station maintenance and advanced microgravity science.
Commander Max Suraev and Flight Engineer Alexander Samokutyaev are scheduled to open the Pirs docking compartment hatch to the vacuum of space Wednesday at 9:24 a.m. EDT to begin the third spacewalk for Expedition 41.
Every year, NASA’s Chandra X-ray Observatory looks at hundreds of objects throughout space to help expand our understanding of the Universe. Ultimately, these data are stored in the Chandra Data Archive, an electronic repository that provides access to these unique X-ray findings for anyone who would like to explore them. With the passing of Chandra’s 15th anniversary in operation on August 26, 1999, the archive continues to grow as each successive year adds to the enormous and invaluable da [...]
After 116 days of being subjected to extremely frigid temperatures like that in space, the heart of the James Webb Space Telescope, the Integrated Science Instrument Module (ISIM) and its sensitive instruments, emerged unscathed from the thermal vacuum chamber at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
Teams of engineers and technicians have been on heart-monitoring duty around the clock since this complicated assembly was lowered into the chamber for its summer-long test [...]
Massive black holes spewing out radio-frequency-emitting particles at near-light speed can block formation of new stars in aging galaxies, a study has found.
The research provides crucial new evidence that it is these jets of “radio-frequency feedback” streaming from mature galaxies’ central black holes that prevent hot free gas from cooling and collapsing into baby stars.
“When you look into the past history of the universe, you see these galaxies building stars,” said Tobias [...]
The brightly glowing plumes seen in this image are reminiscent of an underwater scene, with turquoise-tinted currents and nebulous strands reaching out into the surroundings.
However, this is no ocean. This image actually shows part of the Large Magellanic Cloud (LMC), a small nearby galaxy that orbits our galaxy, the Milky Way, and appears as a blurred blob in our skies. The NASA/European Space Agency (ESA) Hubble Space Telescope has peeked many times into this galaxy, releasing stunning ima [...]
The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter captured views of comet C/2013 A1 Siding Spring while that visitor sped past Mars on Sunday (Oct. 19), yielding information about its nucleus.
The images are the highest-resolution views ever acquired of a comet coming from the Oort Cloud at the fringes of the solar system. Other spacecraft have approached and studied comets with shorter orbits. This comet's flyby of Mars provided spacecraft [...]
NASA's Mars Exploration Rover Opportunity captured images of a comet passing much closer to Mars than any previous known comet flyby of Earth or Mars. The images of comet Siding Spring were taken against a backdrop of the pre-dawn Martian sky on Sunday (Oct. 19).
Researchers used Opportunity's Pancam to image at a range of exposure times about two-and-one-half hours before the closest approach of the nucleus of comet Siding Spring to Mars. By the time of closest approach at about 87,000 miles [...]
Whatever hit Mimas nearly destroyed it. What remains is one of the largest impact craters on one of Saturn's smallest moons. The crater, named Herschel after the 1789 discoverer of Mimas, Sir William Herschel, spans about 130 kilometers and is pictured above. Mimas' low mass produces a surface gravity just strong enough to create a spherical body but weak enough to allow such relatively large surface features.
Mimas is made of mostly water ice with a smattering of rock - so it is accurately [...]
A pair of cosmonauts suited up for a dry run of Wednesday’s spacewalk while Dragon will hang on to the International Space Station for a few more days.
Commander Max Suraev and Flight Engineer Alexander Samokutyaev spent Monday readying the Russian Orlan spacesuits they will wear when they exit the Pirs docking compartment Wednesday for a six-hour spacewalk.
The duo donned their spacesuits for a spacewalk dry run. They checked suit controls and communications gear and conducted prelim [...]
The sun emitted a significant solar flare, peaking at 1:01 a.m. EDT on Oct. 19, 2014. NASA's Solar Dynamics Observatory, which is always observing the sun, captured an image of the event.
Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel.
To see how this ev [...]