Lancaster, Pennsylvania -- News 8 received calls and e-mails from viewers after they saw a flash of light in the sky Thursday night.

Most people reported seeing a bright light in the sky at about 9:30 p.m.

News 8 checked with Cosmic Mike at North Museum in Lancaster.

He thinks the light was a fireball, which is a large meteor.

A meteor is a piece of rock or grain of sand. If the fireball is big enough, it can make a noise when it enters the atmosphere.

Cosmic Mike also said there is a meteor shower going on right now. The peak was June 23 around the big dipper, which is where some viewers reported seeing the fireball.

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