NASA mulls plan to drag asteroid into lunar orbit

NASA is mulling over a plan to build a robotic spacecraft to grab a small asteroid and place it in high lunar orbit, according to researchers with the Keck Institute for Space Studies in California.
The mission would cost about $2.6 billion and could be completed by the 2020s, New Scientist reports.
The Obama administration has said it also wants to send astronauts to a near-Earth asteroid. One proposed target, chosen because of its scientific value and favourable launch windows for a rendezvous, is a space rock called 1999 AO10.
The mission would take about half a year, exposing astronauts to long-term radiation beyond Earth’s protective magnetic field and taking them beyond the reach of any possible rescue.