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A large meteor blazed across the midwestern U.S. sky Wednesday night.

Igniting over Wisconsin,

based on video of the fireball, astronomer Mark Hammergren thinks the meteoroid—the space rock that causes the meteor, or fireball—may have been up to six feet (1.8 meters) wide and weighed roughly a thousand pounds (453 kilograms) or more.

"One of the misconceptions about bright meteors is that they're due to very tiny objects," said Hammergren, of the Adler Planetarium in Chicago, who didn't catch the fireball sky show himself.

But "if something is bright enough to light up the sky like daytime and cause sonic booms throughout the entire area, it's big. It was major," he said. "If it was daytime, people would have undoubtedly seen smoke trails."

Iowa, Illinois, and Missouri around 10:15 p.m., local time, the fireball briefly turned night to green-tinged day and unleashed a sonic boom heard for hundreds of miles around.