WHEN AURORAS COLLIDE

A continent-wide network of all-sky cameras has photographed a never before seen phenomenon: colliding auroras that produce explosions of light. The must-see images have solved a long-standing mystery of Northern Lights. Get the full story from Science@NASA.
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CURIOUS EVENTS IN NEBRASKA

"Last night, Dec. 16th at 9 p.m. CST, a very bright meteor lit up the completely overcast sky like lightning in southeast Nebraska," reports Trooper Jerry Chab of the Nebraska State Patrol. "It flashed for approximately 2 seconds and was followed by sonic booms and ground shaking, which prompted many calls by the public to law enforcement in a three county wide area." Meanwhile, the USGS says there was a magnitude 3.5 earthquake near Auburn, Nebraska, at 8:53 pm, about the same time and place as the fireball. This map shows the nominal epicenter:

"If the earthquake is confirmed, as it appears to be, I think we have the most cosmic of coincidences: A large fireball around the same time of an earthquake," says Chab. "I am simply amazed!"

One possible interpretation of these events is that a small asteroid hit Earth's atmosphere and caused the ground to shake when it exploded in mid-air. However, the timing might not be right. The quake seems to have preceded the fireball. Several readers have pointed out studies that associate lightning-like phenomena with earthquakes: #1, #2, #3. So, the earthquake might be responsible for both the shaking and the light show. Or it might be a big coincidence just as Chab suggests.

More reports could help sort out the possibilities. Readers in Nebraska with photos or eyewitness accounts are encouraged to submit their observations.

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