,                                                          

                              showers at 12.8 kilometers per second or slower                          

Created over 50,000 years ago

made of Nickel - iron

                                                                                      50 meters across                                                                                    

Found in Arizona

50 feet in diameter

first identified as an impact crater

formed by a asteroid meteoroid or comet smashing into a planet or a satellite

only can crash into earth and not the other planets

know as barringer crater

this is a simple crater

scientists have realize that pieces of the impactor often do not survive the collision intact