Aliens are coming. How soon do we find out?
March 28, 2011 8:10 PM Subscribe
If an alien spaceship was approaching earth, how soon would we detect it?
posted by giggleknickers to Science & Nature (19 answers total) 6 users marked this as a favorite
I know it's a bit of a silly question, but we hear so much about UFO sightings and it makes me wonder. If an alien spaceship was coming towards us, wouldn't we be aware of it long before it was visible to the naked eye? That is assuming that it doesn't have some kind of cloaking technology to keep it invisible to us, of course.