This hack was the protest against possible U.S strike over Syriaand National Security Agency NSA‘s spying over Brazilian government and population. All the site have been defaced and hackers left the message stating
NASA HACKED! BY #BMPoCWe! Stop spy on us! The Brazilian population do not support your attitude! The Illuminati are now visibly acting!Hackers deface the sites of following, Kepler Mission, Arctic Mars Analog Svalbard Expedition (AMASE), NASA Events domain, Ames Academy for Space Exploration, NASA’s Office of Planetary Protection, Virtual Astrobiology, NASA recruitment domain, NASA Lunar Science Institute, Moon Fest 2009 and domain of International Lunar Network (ILN).
Obama heartless! Inhumane! you have no family? the point in the entire global population is supporting you. NOBODY! We do not want war, we want peace!!! Do not attack the Syrians!
At the time of writing some of the site have been restored and some are taken down showing the message of Maintenance.
You can find the list of the hacked site with there mirrors here.