NEWS: Hackers had 'full functional control' of Nasa computers

http://www.bbc.co.uk/news/technology-17231695

The hackers entered NASA's system. During 2010 and 2011 they had more than 5000 computer accidents related endangered of information from NASA.

You can't tell for certain who it is because there are people who do it for pleasure and there are other people that makes a profit, within which there have been arrests in several countries.

Therefore, the information of NASA is in constant danger.