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The scientist cited a moral obligation to leave his post at NASA and campaign more actively for political and legal efforts to limit greenhouse gas emissions.

Also: New CTA trains / Jon Stewart mocks Obama / Chicago toilets / Standardized test protest / Earth-like planets.

The Adler Planetarium commemorated the 40th anniversary of the Apollo 17 mission, the last manned mission to the moon. Astronauts Harrison Schmitt and Eugene Cernan cast hand and boot prints for display. Apollo 13 astronaut Jim Lovell was also present.

On Monday, President Obama paid homage to the Mars Science Laboratory mission team. Northwestern University professor Bill Savage takes it one step further and gives a lot of credit to Curiosity, the Mars rover itself. 

Robots present “the same choice we face when we have children, or pets, or anything else that can go haywire," says comedian Whit Nelson."There is always a risk your children will turn out terribly. But that risk alone isn’t enough to stop most of us from having kids.”

The organization that once inspired thousands of kids to pack their bags and go to Space Camp has been looking a little worse for the wear lately. Comedian and science buff Whit Nelson reveals why we should be worried about the aliens coming to get us.

Chicago-based Boeing announced new plans on Monday to build space shuttles for people and cargo. Boeing will build reusable capsules that can take up to seven people into space.Ever since NASA's space shuttle program ended, the U.S.