That's the fear of some NASA scientists who decided to, at the same time, inform people about their capacities to protect the Earth against collision with asteroïds but also to give a strong alert to the lack of funds to implement solutions ... which are very expensive.
NASA is able to prevent the earth from all collision with an asteroid but needs money for that.
Currently, the most observed asteroid is Apophis, closely observed by scientists since june 2004. The reason of this strong watching is simple : it could collide with the Earth.
See complete article here :
I give below three others links about meteor and asteroids which I found very interesting :
http://www.meteorites.com.au/films/
http://www.unb.ca/passc/ImpactDatabase/index.html
http://www.unb.ca/passc/ImpactDatabase/index.html
Enjoy your week end,
Kalinoux
