We've Observed Mars for Decades, But Still Have No Big Theories

Mars geologist Phil Christensen says we're still short on understanding the red planet. "The devil continues to be in the details," he said at this week's Eighth International Conference on Mars. Astrobiologist David Des Marais said Mars research today adds up to "lots of observations but no overarching… » 7/26/14 6:11pm Saturday 6:11pm

NASA Has Released Printable 3D Models Of Spacecraft And Planets

Would you like to create a perfect replica of the Cassini spacecraft? The Itokawa asteroid? The Gale Crater on Mars? The near and far sides of the lunar surface? If you are among the growing number of 3D printer enthusiasts, you can now download these and other models for free from NASA. » 7/24/14 11:49am 7/24/14 11:49am