(NASA Photo) NASA says the launch of its flagship James Webb Space Telescope is being rescheduled for no earlier than 2021, with its total price tag boosted to $9.66 billion. That price tag ...

NASA is using a simple but effective technology called Laser Retroreflective Arrays (LRAs) to determine the locations of lunar landers more accurately. They will be attached to landers sent to the ...

This photograph shows a mockup laser retroreflector array (LRA) at NASA’s Goddard Space Flight Center, Greenbelt, Maryland, demonstrating the basic design: a metallic semi-hemispheric disc, with ...