GoForSmoke:
lesto:
what i can't understand is if someone like nasa or similar had seen this metereo approcing, or we are completely unaware of some dangerus-but-not-too-big meterHow wide is the sky and beyond, out past the Moon orbit? How small is a 1km rock at 500,000km? Now how small is a less than 20m rock?
At relative speeds of asteroid and Earth you need to find the asteroid(s) and determine if/where any might hit the sky in enough time to give meaningful warning, more than just "Everybody duck!" which really means get your cameras out.A 17m rock didn't get noticed until 32 seconds(?) before it exploded. Then it got noticed. That was the warning but who knew what to do? Maybe people knowing more what they see and take action to get under cover is sooner possible? That rock could have killed most everyone in the open for many km around just from the blast had it come much lower.
I think of these rocks and the ones going by as missed resources. I won't say they'd be used wisely (more likely be used to take war to a new level) but there they are.
wrong. the russian meteor was noticed and shot at by aliens protecting us. goto youtube and look it up