Stargazers got an big grand finale to the predawn Lyrid meteor shower when a giant fireball streaked across the sky, startling people across California and Nevada. Law-enforcement agencies in Nevada and California were flooded with calls Sunday morning after a loud explosion rattled homes and set off car alarms across the states. Some residents reported seeing a giant fireball with a green body and red head streaking across the sky. Astronomers say it was likely a rare meteor that burned up five miles above the earth and unrelated to the Lyrid shower. Most meteors disintegrate much higher in the atmosphere.