Scientists say the threat of a newly discovered asteroid has risen slightly in the past few weeks, as the world's telescopes rush to track its course.

NASA says it's aware of an asteroid with a "very small chance" of hitting Earth in seven years. It's raised questions about what scientists could do to divert a threatening asteroid — and who would be responsible for it.

An asteroid being monitored closely by scientists could potentially collide with Earth, but there is also the possibility of the space rock hitting the Moon. According to latest calculations, there is a 2.