NASA has released satellite images of a new island that reared up from the sea off Pakistan's coast after a powerful earthquake.
NASA scientists are searching for new ways to use the broken planet hunting space telescope Kepler.
Earth appears as a tiny blue dot in a rare photo taken from Saturn by NASA's Cassini spacecraft.
The 354-kilogramme cooling pump is about the size of a double-door refrigerator and extremely cumbersome to handle, with plumbing full of toxic ammonia. The pump replacement is a huge undertaking attempted only once before, back in 2010 on this very unit.
The two astronauts who tackled the job three years ago were in Mission Control, offering guidance. After exiting the Quest airlock Saturday, flight engineer Mike Hopkins made his way out to the work site.
He attached himself to a foot restraint at the end of the station’s 57-foot robotic arm so that Flight Engineer Koichi Wakata, the robotics operator for the spacewalks, could fly Flight Engineer Rick Mastracchio to the work site and position him for his various tasks.
A 5-hour, 28-minute spacewalk outside the International Space Station completed the first in a series of excursions to replace a degraded pump on the station's cooling system. A second spacewalk will take place on Christmas eve
A day later than planned, the extra time will allow the crew to resize a spare spacesuit on the space station.
For more information visit the Nasa website
Two NASA astronauts are taking part in the first of three scheduled spacewalks throughout the festive season.
The spacewalk, which was broadcast live on NASA Television, is the first for NASA since July when the spacesuit helmet worn by Italian astronaut Luca Parmitano began filling with water, a situation that could have caused him to drown.
The helmets of the astronauts have now been fitted with snorkels in case of similar problems.
Saturday's spacewalk was prompted by the 11th December shutdown of one of the International Space Station's two ammonia cooling systems, which forced the crew to turn off non-essential equipment and shut down dozens of science experiments.
Astronauts aboard the International Space Station will begin a series of spacewalks this weekend to repair the orbital outpost's cooling system, NASA has announced.
One of the station's two ammonia cooling systems shut down last Wednesday, forcing astronauts to power down unnecessary equipment and suspending some of the laboratory's science experiments. The six-member crew was not in any danger, NASA said.
The US space agency has decided to have two astronauts aboard the station replace an apparently faulty valve inside a pump outside the station with a spare.
Three spacewalks are planned to complete the work, the first of which is scheduled for Saturday by station flight engineers Rick Mastracchio and Michael Hopkins. Two more spacewalks are targeted for December 23 and the last on Christmas Day.
The walks will delay a cargo resupply flight until January.
An iceberg roughly the same size as Singapore has broken off a glacier in Antarctica.
An image taken by NASA shows the huge iceberg calving from the Pine Island glacier, one of largest and fastest moving glaciers in the region.
Iceberg B-31 is estimated to be 35x20 kilometres (21x12 miles) which is about 50% larger than previous icebergs in this area.
Splits in the ice have been seen since January 2011 and subsequent images have shown the crack grow until the iceberg eventually calved, experts believe it may have separated during the summer but remained very close to the glacier since then.
A team of scientists from Sheffield and Southampton universities will track it and try to predict its path using satellite data.
NASA has said its crew members on board the International Space Station are not in any danger following a fault with one of the station's cooling systems.
Ground crews are continuing to investigate the fault.
A NASA spokesman said: "At no time was the crew or the station itself in any danger, but the ground teams did work to move certain electrical systems over to the second loop.
"Some non-critical systems have been powered down inside the Harmony node, the Kibo laboratory and the Columbus laboratory while the teams work to figure out what caused the valve to not function correctly and how to fix it.
"The crew is safe and preparing to begin a normal sleep shift while experts on the ground collect more data and consider what troubleshooting activities may be necessary."
There is an urgent but not an emergency situation on board the International Space Station (ISS) that may require a space walk repair, NASA has told NBC News.
Earlier today one of two cooling loops on the ISS stopped working, which engineers believe was caused by a problem with a flow-control valve.
They are currently re-routing the space station's cooling systems onto the working loop, which means prioritising life control system, science experiments and electrical systems, NASA said.
Should an urgent space walk repair be required, it will take place in the next 24-48 hours.
There are currently three Russian, two American and one Japanese astronauts on board the ISS.
Astronomers have spotted what appear to be two super massive black holes at the heart of a remote galaxy, circling each other like dance partners.
"At first we thought this galaxy's unusual properties might mean it was forming new stars at a furious rate," said Peter Eisenhardt, at NASA, "but on closer inspection, it looks more like the death spiral of merging giant black holes."
Follow-up observations revealed unusual features in the galaxy, including a lumpy tail of matter, or jet, thought to be the result of one black hole causing the jet of the other to sway.
"We think the jet of one black hole is being wiggled by the other, like a dance with ribbons," said Chao-Wei Tsai, "If so, it is likely the two black holes are fairly close and gravitationally entwined."
The findings could teach astronomers more about how super massive black holes grow by merging with each other.
Almost every large galaxy is thought to harbour a super massive black hole filled with the equivalent in mass of up to billions of suns.
NASA has launched a rocket set for Mars to study the red planet's atmosphere.
The Maven spacecraft is due to reach Mars next Autumn following a journey of more than 440 million miles.
Scientists want to unravel the mystery of the planet's drastic radical climate change, with Mars being warm and wet in its first billion years to cold and dry today.
The mission, which has cost $671 million (£417m), is NASA's 21st to the red planet since the 1960s but it is the first dedicated to studying the Martian upper atmosphere.
A Briton has been charged with hacking into computer systems of the US military, NASA and other federal agencies.
Lauri Love, 28, is accused of working with two other people in Australia and one in Sweden, who have not been charged, according to the Associated Press.
The US government said the purpose of the Briton's hacking was "to disrupt the operations and infrastructure" of the federal government.