Astronomers want to know more about a cucumber-shaped object that came hurtling through our solar system. ...

A look at these awesome sketches is like going back in time. ...

Newly released video shows two Navy pilots encountering a mysterious object. This, as the Pentagon announces it ran a secret UFO investigation program for years. ...

Webcams in a very fitting spot captured a spectacular sight in the night sky over Wisconsin. ...

Residents of several states got quite a view Friday night after the latest SpaceX launch. The launch successfully sent a communications satellite into orbit. The Falcon 9 rocket and its cargo of the Iridium-4 became visible across parts of California, Nevada, and Arizona shortly after blasting off from Vandenberg Air Force Base in California. ...

A full moon rises of British Columbia, Canada. (Nick Fitzhardinge/Getty Images) At a Glance Some places will experience a supermoon, a blue moon and a total lunar eclipse on the same night.A supermoon appears up to 30 percent brighter and up to 14 percent larger than normal.A blue moon is the second full moon in a calendar month. Stargazers are in for a quadruple treat in January:two supermoons,a blue moon and a total lunar eclipse will adorn the night sky....

The appropriately-named Halloween asteroid will whiz past Earth in November. ...

A SpaceX rocket launches a secret satellite into orbit from Florida. ...

The image above shows an ancient rock carved with what is likely the oldest-known sky chart and depiction of a supernova. (Tata Institute of Fundamental Research) At a Glance An ancient rock carving may be the oldest known sky chart and depiction of a supernova. The carving was discovered in Kashmir, India, at a site dating back to 2100 BC. It initially appeared to be a hunting scene, but scientists believe it is a record of a supernova. A rock...

The process of building the world’s largest telescope is a marvel in engineering. ...

The process to disperse water in the upper atmosphere during the Super Soaker mission is tested at NASA's Wallops Flight Facility. ...

The image above shows an artist's rendition of the K2-138 system, the first multi-planet system ever discovered through crowdsourcing research. (NASA/JPL-Caltech) At a Glance Astronomers have discovered what appears to be a five-planet solar system.The system is the first of its kind to ever be discovered through crowdsourcing research.The planets are circling the star K2-138.There may even be even more undetected planets orbiting within the system. What appears to be a five-planet solar system has been spotted orbiting a star,...