The discovery of an extraordinary multi-planet system has demonstrated that so-called "hot Jupiter" planets may not be lonely giants after all. The findings could force scientists to revise their ...

The planets are visible throughout February, "but they’ll be lined up best toward the end of the month,” NASA says.

Illustration of a Mars transit habitat and nuclear propulsion system that could one day take astronauts to Mars. Credit: NASA For NASA, sending a crewed mission to Mars has been the long-term goal for ...