More than two dozen people in Nevada and California reported seeing a fireball cross the sky early Thursday morning.The reports, listed by the American Meteor Society, were that the fireball lit up the night sky at about 5 a.m. In all the society's Web site received 30 reports.Fleischmann Planetarium Associate Director Dan Ruby said he didn't see the fireball, but that he'd heard people saw a blue flash above Lake Tahoe."We got some calls," he said. "My best guess is that it was the break-up of a bolide, a form of meteor."Meteors strike the Earth's atmosphere regularly but sightings are …