The mysterious boom and flash of light seen over parts of Virginia Sunday night was not a meteor, but actually exploding space junk from the second stage of a Russian Soyuz rocket falling back to Earth, according to an official with the U.S. Naval Observatory.

"I'm pretty convinced that what these folks saw was the second stage of the Soyuz rocket that launched the crew up to the space station," said Jeff Chester of the Naval Observatory in Washington, D.C.

Residents of the areas around Norfolk and Virginia Beach, Va., began calling 911 last night with reports of hearing a loud boom and seeing a streak of light that lit up the sky, according to news reports.

Chester heard about the incident this morning; the Naval Observatory gets plenty of reports of such fireballs and Chester investigated whether it could be a meteor or whether there were "any potential decays of space junk that were coming up," he told SPACE.com.

• Click here to visit FOXNews.com's Space Center.

He checked the listing for debris that were expected to enter the lower atmosphere from their decaying orbits around this time period and found that second stage of the Soyuz rocket that launched last Thursday was slated to hit during a window that started at 8 p.m. last night.

The Russian-built Soyuz rocket lifted off Thursday from the Central Asian spaceport of Baikonur Cosmodrome in Kazakhstan to launch a new crew and American billionaire Charles Simonyi — the world's first two-time space tourist — to the International Space Station. The spaceflyers arrived at the space station on Saturday.

Chester ran a satellite tracking program that showed that the rocket debris should have come down exactly in the area where the fireball was spotted.

"This is just too much of a coincidence to be coincidence," he said.

Chester said that U.S. Space Surveillance Network had not yet confirmed that this was the case, but said that he was "99 and four one-hundredths [percent] convinced that this is what it is."

The descriptions of the boom and streak of light reported by local residents were "entirely consistent with re-entering space junk, especially something this big," Chester said.

Delta airline pilot Bryce Debban reported seeing the streak of light on a flight from Boston to Raleigh-Durham when his plane was about 31,000 feet in the air.

"We saw it streak across the sky and then blow up," Debban told SPACE.com. "It was brighter than the full moon. It lit up the cockpit as if it were daylight."

James Zimbelman of the Smithsonian National Air & Space Museum's Center for Earth and Planetary Sciences said that the explosion being caused by a re-entering rocket was very plausible.

It "sounds all too reasonable," he said.

A rocket stage would fragment and explode "just as if it were a meteorite," he said.

And the size of the rocket would explain why the explosion was seen over so wide an area.

The Soyuz rockets jettison their second stage after entering orbit in such a way that the second stage will slowly fall back to earth in a few days.

But "you can control precisely where these things are going to come down," Chester said.

It's possible that some fragments of the rocket made it to the Earth's surface, but they would likely have a couple of hundreds of miles east of Cape Hatteras, Chester said.

Copyright © 2009 Imaginova Corp. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.