well lets see 400 meters across (now say the US decides to send a rocket up with 10 nukes attached say towards the end of next year to blow up near it and simply alter its course - heck 10 nukes could probably vapourise something that size - its technically possible nowdays and they have 24-25 years to worry about it.
Still it might focus a few minds on getting more humans and more money into space exploration and space travel casue as stated there are bigger rocks out there.
|