If you want to worry about all that stuff in space hurtling towards earth, well, there's plenty to worry about: asteroids and comets, everything from the size of cars to small continents, whizzing through our solar system.
A few days back, one of them, a spinning ball of rock and gas more than half a mile across came very close to earth, a mere 74-thousand miles away. Hah, you say, 74-thousand miles; that's not close. But think. That asteroid, traveling more than 20-thousand miles an hour, passed well inside the orbit of the moon.
Had it hit, the impact would've been like a nuclear bomb. And guess what? No one saw it coming. No one even knew about it until it had passed. Now, see if deciding when to wash the car takes on a different perspective.
