Photo: Massive black hole galaxy spews powerful radio waves
May 18, 2012, 4:51 p.m. by Catie Leary
In the center of Centaurus A is a supermassive black hole -- believed to be 100 million times more massive that our sun -- which is responsible for the galaxy's bright nucleus and some of the most powerful radio emissions in our night sky.
Photo: Want to protest something? Chicago's the place to be
May 18, 2012, 10:21 a.m. by Catie Leary
Demonstrators in Chicago protest the proposed Keystone pipeline that would transport oil from the Alberta Tar Sands, days ahead of the NATO 2012 Summit, which is attracting swarms of activists who want to air their grievances.
Photo: Greenpeace calls on Microsoft for cleaner clouds
May 15, 2012, 10:48 a.m. by Catie Leary
Activists in Tel-Aviv clutched fistfuls of black balloons to symbolize the coal-powered electricity used to run Microsoft's cloud data centers.
Photos: Newly hatched Cygnets usher in start of summer
May 14, 2012, 10:50 a.m. by Catie Leary
The baby swans signal the start of the new season at the Abbotsbury Swannery, which is the only publicly accessible colony of nesting mute swans in the world.
Photo: Michelle Obama honors moms, military spouses
May 11, 2012, 11:01 a.m. by Catie Leary
First lady Michelle Obama and Jill Biden, wife of Vice President Joe Biden, host a party at the White House to celebrate Mother's Day and Military Spouse Appreciation Day.
Photo: Synchronized swimmers ready to shine at Olympics
May 9, 2012, 11:36 a.m. by Catie Leary
Great Britain's synchronized swimming team is counting down the days to the start of the London Games.
Photos: Surfers hold 'paddle-out' memorial for Junior Seau
May 8, 2012, 1:15 p.m. by Catie Leary
Hundreds of surfers and spectators gathered in Oceanside, Calif. for a heartfelt surfing tribute in memory of deceased linebacker Junior Seau.
Photos: Chimney sweeps celebrate spring tradition in Britain
May 8, 2012, 11:20 a.m. by Catie Leary
This year marks the Sweeps Festival's 32nd anniversary since it was reintroduced in 1981, marking a 400-year-old event. The celebration includes Morris folk dancing and a traditional 'man-eating' garland ceremony.
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