A rare full seven-planet alignment will be visible in the early night sky between Feb. 22 and 28. We have the tips you need to best see all the planets.

The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it ...

* To avoid being charged the recurring subscription fee, simply cancel before the free-trial period ends — it's just $4.99 a month afterwards. The go-to solution for ultimate PC performance and ...

Elon Musk Steps Up Efforts to Cull Federal Work Force Mr. Musk said federal workers must summarize their accomplishments for the week or be forced to leave, borrowing a tactic he used at his ...