 A Northeast mystery solved. Midday ground shaking has been blamed on a meteor traveling at 34,000 miles per hour over New York and New Jersey in broad daylight. Bill Cook with NASA's Meteoroid Environment Office. It's something when it's moving that fast, of course, heats up and it begins to ablate, you know, just like a spacecraft reentering the atmosphere. And it produces a lot of light and it generates what we call fireball.