by JACLYN DIAZ via npr.org It wasn't a bird or a plane that gave Floridians a shock late Monday night. It wasn't even Superman. A meteor shot across the sky around 10 p.m. Monday. On social media, residents along the state's Atlantic coast, from West Palm Beach south to Miami, shared videos on Twitter of the surprising sight. Dashcam footage and security videos showed a still, dark night suddenly lit up by what appeared to be a large fireball streaking diagonally across the sky. In just a few seconds, it was over. According to NASA, an asteroid is a small rocky object that orbits the sun. A meteor is what happens when a meteoroid - a small piece of an asteroid or comet - burns up upon entering Earth's atmosphere, creating a streak of light in the sky. There's disagreement online over whether the Monday night visitor was the asteroid 2021 GW4 that was expected to make a close shave with Earth's surface Monday evening. Close for a space rock anyway. It was expected that 2021 GW4