A comet traveling outside the solar system and heading toward the Earth is much larger than scientists first believed, a scientist has detailed in a new report. Avi Loeb claims the comet could even be ...

NASA scientists say a rock sample collected by the Perseverance rover in Jezero Crater may contain the strongest signs yet of ancient microbial life on Mars, though more analysis is needed before ...

NASA is set to launch three small rockets into the upper atmosphere late Monday, and some people on the East Coast may be able to see colorful vapor trails that will be released shortly after liftoff.

UPDATE: The rocket launch was scrubbed at about 2 a.m. Wednesday because of cloudy skies and other atmospheric conditions. NASA says it will try again between 10:30 p.m. Wednesday and 3:30 a.m.