There are a lot of giant asteroids out in space, and it’s just a matter of time before another one finds a bullseye on Earth. What can we do about it? — On September 2, 2022, NASA crashed its DART probe into the small moon of an asteroid named Didymos, deflecting its orbit in a successful test of one strategy we can use to defend the earth from celestial threats. Not long ago, and with no fanfare, we came into sudden…