Space slam: How and why NASA crashed its DART spacecraft into asteroid

The first test of NASA’s DART mission was a smashing success, after the spacecraft successfully crashed into an asteroid. But did it change the space rock’s trajectory? Eric Sorensen explains when scientists will get that answer, how they were able to execute the crash, and how an operation like this could help defend Earth from future outer-space threats.

• NASA’s DART mission a success as spacecraft smashes into asteroid