In a galaxy where asteroids have pummeled planets for billions of years, now one planet strikes back. For the first time in our planet's history, NASA will test an asteroid deflection technique. It's the first planetary defense method of its kind. NASA's double asteroid redirection test will intentionally ram itself into an asteroid and alter its orbit forever. At the crossroads of science fiction and reality, Dart is part of our plan to defend planet Earth against potential future impacts. The test to protect the future of our planet takes place today.