ABC News @ABC
The DART spacecraft slammed into a harmless space rock to change its orbit—a tactic that could be used one day to stop a killer asteroid from hitting Earth. But making sure this strategy works will require careful follow-up observations. @NatGeo explores: https://t.co/84jEbZna5J https://t.co/C0bg1e7zTd — PolitiTweet.org