The mysterious, fabled "Planet 9" will have nowhere to hide once a new astronomical experiment is underway, scientists think. Some scientists believe a mysterious, as-yet-unseen planet might be ...

In this video segment adapted from NOVA scienceNOW, learn about the debate over the definition of a planet. Historically, there has been no scientific definition for a planet, leaving astronomers with ...

Planets that are twice as far away as Earth appear 16 times dimmer since the intensity of sunlight weakens by a factor of four going out and by another four times coming back. If Planet 9 is at an ...

Popular 3D planet weather simulator Living Earth - Clock & Weather has received a major update today, featuring a refreshed design for iOS 7, additional support for weather conditions such as ...