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 1:00pm Saturday 1:00pm

Two Small Rocks From Space, Two Giant Lawsuits For Mankind

Forty-five years ago yesterday, on July 20, 1969, Edwin "Buzz" Aldrin and Neil Armstrong stepped into history. Shortly before 11 p.m. Eastern time, the pair emerged from their landing craft, the Eagle, and became the first men to set foot on the moon. This week, On Remand looks back at that "one giant leap for… » 7/23/14 5:56am Wednesday 5:56am

Curiosity Rover Finds A Huge Metal Meteorite

Talk about heavy metal! This shiny, lumpy rock spotted by NASA's Curiosity rover is likely made mostly of iron —andcame from outer space! It's an iron meteorite, similar to ones found in years past by Curiosity's forerunners Spirit and Opportunity, but is considerably larger than any of the ones the MER rovers came… » 7/15/14 7:00pm 7/15/14 7:00pm