Asteroid BC15 ("discovered" yesterday) closer than Tu24 and it's closest dist. to earth is Today?

It's not a surprise stuff like this is detected when it's already close to Earth. Brightness decreases exponentially with distance, so it's much easier to see stuff the closer it is.

reply to post by 1Angrylightbulb


If these were aliens trying to attack us I would think they would:
1) Have better aim
2) Throw a lot more rocks and more closely together

But then why attack us? Anything the Earth has to offer they can get far more easily from the rest of the Solar System. Unless of course they want us. Then why throw rocks that could kill us off?