NASA said it has received 400 mission concepts from scientists and engineers for a future Mars mission. Scientists and engineers submitted their ideas to the Concepts and Approaches for Mars Exploration Workshop in Houston.

Ed Weiler, who has worked almost 33 years as a leader in NASA's science exploration programs, will retire from the agency effective Sept. 30.

WASHINGTON, Sept.

NASA's new video series offers the public a fast and fun way to learn about scientific discoveries and facts about Earth, the solar system and beyond.

WASHINGTON, Feb. 4, 2011 /PRNewswire-USNewswire/ -- NASA will score big on super SUN-day at 11 a.m. EST, Sunday, Feb.