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Russian cosmonauts wrap up successful spacewalk
Two cosmonauts ventured outside the International Space Station, jettisoning three no-longer-needed components and carrying out a photo survey of the Russian segment of the lab complex in the seventh and final spacewalk planned by the station crew this year.
Comet’s flyby of Mars a boon for scientists
The red planet's brush with Comet Siding Spring was a close encounter of the best kind for science, a once-in-a-lifetime chance to study a pristine remnant of the solar system's birth 4.6 billion years ago as it makes its first and possibly last visit to the warmth of the inner solar system.
Spacewalk achieves all major objectives
Astronauts Reid Wiseman and Barry "Butch" Wilmore floated outside the International Space Station and, after a bit of trouble with a balky bolt, replaced a broken voltage regulator in one of eight solar power channels to restore the lab's electrical grid to normal operation.
VideoFleet of Mars probes set to observe comet flyby
An international fleet of five Mars orbiters and two rovers will have ringside seats when a mountain-size comet streaks by on Oct. 19, passing within a scant 87,000 miles of the red planet at a blistering 126,000 mph.
NuSTAR discovers brilliant ‘mighty mouse’ pulsar
A NASA space telescope studying X-ray emissions from a nearby galaxy has discovered the brightest pulsar ever detected, the fast-spinning remnant of a collapsed star that shines so intensely it was initially mistaken for a massive black hole, a possible "missing link" between compact stellar-mass black holes and the unseen monsters lurking at the cores of many galaxies.
Station crew completes maintenance spacewalk
Working outside the International Space Station, NASA astronaut Reid Wiseman and European Space Agency crewmate Alexander Gerst successfully moved a failed ammonia pump module to an external stowage platform, completing a task originally planned for a repair spacewalk last December.
Aerojet Rocketdyne touts AR1 engine for Atlas 5
Aerojet Rocketdyne is pressing ahead with development of a powerful new rocket engine that company officials believe will be an attractive alternative to the Russian-built RD-180 engine that now powers the first stage of United Launch Alliance's workhorse Atlas 5 booster.