Mars was born with a fatal flaw that doomed it to become a barren lifeless place, according to new research: it was always too small to retain large amounts of water. Evidence that water was once present on Mars has been mounting for decades and this month NASA's Perseverance rover collected rock samples which have all but confirmed groundwater flowed on the red planet.
Don’t worry. You’ll long be dead before that has any chance of happening. So will your children. Probably all of your grandchildren, too. At a news conference Wednesday, NASA scientists said there was a 1-in-1,750 chance that an asteroid named Bennu, which is a bit wider than the Empire State Building is tall, could collide with Earth between now and 2300.