Clayton Anderson

O'Malley asks Maryland regulators to investigate Pepco's handling of power outages. Gov. Martin O'Malley is calling on Maryland regulators to investigate Pepco's handling of power outages that affected more than 300,000 customers late last month, and the head of the Maryland Public Service Commission said Monday the panel will respond to the governor soon.

Shuttle Discovery touched down on Tuesday at NASA's Kennedy Space Center in Florida, making a safe return to Earth after a two-week resupply mission to the International Space Station.

Shuttle Discovery touched down Tuesday at NASA's Kennedy Space Center in Florida, making a safe return to Earth after a two-week resupply mission to the International Space Station.

The landing of the US space shuttle Discovery has been delayed until Tuesday because of fog and rain, NASA's Mission Control said Monday.

Shuttle Discovery astronauts prepared on Monday for a second attempt to descend to Earth, after rain at NASA's Kennedy Space Center in Florida forced them to wave off the first of the day's landing opportunities.

CAPE CANAVERAL, Florida (Reuters) - Space shuttle Discovery left the International Space Station on Saturday, wrapping up a 10-day stay to deliver supplies and spare parts before NASA retires its shuttle fleet later this year.

Astronauts on board the International Space Station (ISS) might have to do an unscheduled fourth space walk to fix a malfunctioning valve on a newly installed ammonia tank, NASA officials said Wednesday.

Astronauts on board the International Space Station (ISS) might have to do an unscheduled fourth space walk to fix a malfunctioning valve on a newly installed ammonia tank, NASA officials said Wednesday.

US astronauts on Tuesday completed the third and last space walk of their mission to the International Space Station (ISS), NASA said.

Two astronauts from the US shuttle Discovery completed Sunday a second spacewalk as part of efforts to replace a depleted ammonia coolant tank outside the International Space Station.

Astronauts take 2nd spacewalk to replace space station cooling tank, overcome stiff bolt. Spacewalking astronauts had to pull out a hammer and pry bar while attaching a big, new tank full of ammonia coolant to the International Space Station on Sunday, successfully driving in a stiff bolt after two frustrating hours.

Two astronauts from the US shuttle Discovery undertook a second spacewalk Sunday as part of efforts to replace a depleted ammonia coolant tank outside the International Space Station.

Two astronauts from the US shuttle Discovery began a second spacewalk early Sunday as part of efforts to replace a depleted ammonia coolant tank outside the International Space Station.

Two astronauts from the shuttle Discovery completed a six-and-a-half-hour spacewalk Friday, helping move an ammonia tank on the outside of the International Space Station.

Two astronauts from the shuttle Discovery completed a six-and-a-half-hour spacewalk Friday, helping move an ammonia tank on the outside of the International Space Station.

Two astronauts from the shuttle Discovery began a six-and-a-half-hour spacewalk Friday, working on an ammonia tank on the outside of the International Space Station, NASA said.

The Discovery crew began to deliver supplies to the International Space Station on Thursday and prepared for the mission's first spacewalk a day after the US space shuttle docked with the orbiting station.

CAPE CANAVERAL, Florida (Reuters) - Space shuttle Discovery and seven astronauts blasted off Monday on one of NASA's final servicing missions to the International Space Station.

The crew of the US shuttle Discovery were welcomed with hugs and handshakes Wednesday aboard the International Space Station after a successful docking high over the Caribbean.

The US space shuttle Discovery successfully linked up with the International Space Station Wednesday, easing into a docking node.