NASA's SPHEREx space observatory has spent the last six weeks undergoing checkouts, calibrations, and other activities to ...

In February, Mercury will join the others in the evening sky, but Saturn and Neptune will be leaving the alignment at that time. The post A Rare Cosmic Event: Four Planets Aligning in the Sky This ...

To spot the celestial 'smiley face,' skywatchers in the U.S. will need a clear view of the eastern horizon in the hour ...