Geoff Brumfiel

Tuesday afternoon, astronomers thought they saw a powerful explosion in the nearby Andromeda galaxy.

The Internet went wild with speculation about what it could be: Had two superdense neutron stars collided? Did a supermassive star explode?

"When I got up this morning and turned on my phone, I had a lot of emails and my Twitter feed was burning," says Phil Evans, an astronomer at the University of Leicester in Britain.

In February, a 55-gallon drum of radioactive waste burst open inside America's only nuclear dump, the Waste Isolation Pilot Plant in New Mexico.

Now investigators believe the cause may have been a pet store purchase gone bad.

"It was the wrong kitty litter," says James Conca, a geochemist in Richland, Wash., who has spent decades in the nuclear waste business.

On May 20, 1964, two astronomers working at a New Jersey laboratory turned a giant microwave antenna toward what they thought would be a quiet part of the Milky Way. They weren't searching for anything; they were trying to make adjustments to their instrument before looking at more interesting things in the sky.

Atlas V (left); Falcon 9 (right)
ULA; SpaceX

The two rockets pictured above may look the same, and in many ways they are: Bo

NASA's Curiosity rover is on an epic trip to a distant mountain, but it took a brief break Wednesday to dip its drill into the Martian soil.

The drilling is taking place at a place called Waypoint Kimberley. The area is a point of convergence for several different types of terrain, says John Grotzinger, the rover's project scientist. The exposed rock and different formations made the way point a good place to "stop and smell the roses," he says.

For decades, researchers and submarine crews in icy waters off the coast of Antarctica have been picking up a mysterious quacking sound.

The "bio-duck," as its called, has been heard on and off since Cold War patrols picked it up on sonar during the 1960s.

"It goes 'quack, quack, quack, quack,' " says Denise Risch, a marine biologist with the National Oceanic and Atmospheric Administration. "It has this almost mechanical feel to it."

Sharks have looked more or less the same for hundreds of millions of years. But a newly discovered fossil suggests that under the hood, a modern shark is very different from its ancient ancestors.

One month ago, Malaysia Airlines Flight 370 disappeared during a routine flight from Kuala Lumpur to Beijing. An international search team has spent weeks combing the Indian Ocean for signs of the missing Boeing 777. Here's a summary of where we are with the hunt for the jetliner.

What do we know?

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Reading through the latest report from the U.N.-sponsored Intergovernmental Panel on Climate Change (IPCC), it's hard not to feel despondent about the state of the world.

The report's colorful charts and tables tell of droughts and fires; depleted fisheries and strained cropland; a world in which heat-related disease is on the rise and freshwater is growing scarce.

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Earlier this week, physicists announced they'd seen evidence of ripples in the fabric of space and time from just moments after the Big Bang. Such ripples were predicted almost a century ago by Albert Einstein.

Einstein's theory of relativity is arguably the 20th century's greatest idea. But not everything he did was right: Some newly uncovered work from the brilliant physicist was wrong. Really, really wrong.

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Physicists claimed the potentially exciting discovery yesterday: a faint signal from moments after the universe began. If confirmed, and there are doubters, that signal could revolutionize our understanding of the cosmos.

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Today, our reporters in Ukraine, Washington and London are following events in and about Crimea.

Edward Warren was shocked when he learned that the airmen in charge of the nation's nuclear-tipped missiles regularly cheated on tests.

In 2009, Warren was fresh out of the Air Force's Reserve Officers' Training Corps. He had just finished training to become a missile launch officer when he was pulled aside.

"One of my instructors said, 'Hey, just so you know, there is cheating that goes on at the missile bases,' " Warren recalls. "I was repulsed. I thought, 'This can't be, this is terrible.' "

Update 1:15 a.m. EDT Tuesday:

A Russian Soyuz capsule carrying a U.S.-Russian crew has landed safely in Kazakhstan, according to NASA. American Mike Hopkins and Russians Oleg Kotov and Sergey Ryazanskiy had spent 166 days in space. Russian space officials had considered delaying the landing because of heavy snowfall and strong winds but decided to go ahead with the original plan.

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