A meteoroid struck the surface of the moon recently, causing an explosion that was visible on Earth without the aid of a telescope, But don't be alarmed if you didn't see it; it only lasted about a second. NASA says the meteoroid was about 40 kilograms and less than a meter wide, and it hit the moon's surface at 56,000 mph. It glowed like a 4th magnitude star, NASA says, thanks to an explosion equivalent to 5 tons of TNT. NASA Astronomers have been watching the moon for the past eight years, looking for this to happen. It’s part of a new program to find new fields of debris that could impact Earth. NASA says not to worry, the Earth isn’t going to be destroyed but we could see a few shooting stars the next few nights.