While Most Folks Were Sitting Down For Supper, NASA Tried To Move A Space Mountain.

While most folks were sitting down for supper, NASA tried to move a space mountain.

Beyond sight for backyard stargazers, a spacecraft the size of a vending machine self-destructed by ramming into a harmless asteroid shortly after 7 p.m. ET Monday, September 26th. The high-speed crash was part of the U.S. space agency's Double Asteroid Redirection Test, or DART.

The moment of impact marked the first time in history humans have attempted to alter the path of an asteroid, a flying chunk of rubble left over from the formation of the solar system about 4.6 billion years ago. Most of the time, these ancient rocks pose no danger to Earth, including Dimorphos, the one NASA just used for target practice. But at least three have caused mass extinctions, the most infamous of which wiped out the dinosaurs.

Stegosaurus didn't have NASA.

"We are changing the motion of a natural celestial body in space. Humanity has never done that before," said Tom Statler, program scientist. "This was the substance of fiction books and really corny episodes of Star Trek from when I was a kid, and now it's real."

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