Greenville, South Carolina -- It's the talk of the town and beyond. On radio, on television and by Internet from the world over, the question of the day has been: So what was that in the sky last night.

Hundreds of folks across the region called and e-mailed media outlets and the National Weather Service to report to report strange blue lights in the night sky Wednesday at about 8:15 p.m.

"We had several calls last night from people around the area who saw lights in the sky," Larry Lee of the National Weather Service told WYFF News 4's Nigel Robertson.

What was it?

"We have no idea," Lee said.

Reports came from as far away as Kentucky, Tennessee and North Carolina.

And due to national Web exposure on The Drudge Report people called WYFF4 from as far away as New Mexico to ask about the lights.

"A blue light streaked across the sky in the Gaffney area. The light ... moved from the Greenville-Spartanburg area toward Huntersville, N.C.," Terry Coyle said. "The object had a bluish green tail about two miles long."

Law enforcement agencies also report receiving calls about the lights, and correspondent Scott Wilson of Gastonia, N.C., also said he saw similar lights in the direction of the Upstate.

While no definitive information is available, WYFF 4 Chief Meteorologist John Cessarich said the most likely cause is a group of meteors streaking into the Earth's atmosphere.

Doug Gegen at the Roper Mountain Science Center agreed, but jokingly would not rule out the possibility of alien spacecraft.

"I mean, I can't say there aren't UFO's," Gegen said. "But it was probably a meteor entering Earth's atmosphere and that can cause multiple streaks and odd colors depending on what the meteor is made of."

So, assuming it was a meteor, should folks be worried?

"The sky is not falling as far as I know," Gegen said with a smile.

As for reports of helicopters in the area on Wednesday night, Cessarich said that he was able to confirm there were military helicopters on routine training missions operating in Greenville and Pickens counties.

There are reports of similar sightings from as far away as Europe. Click here for a story reported by the BBC about strange lights in the night sky above Wales.