An artist’s conception of a distant Solar System Planet X. (Roberto Molar Candanosa and Scott Sheppard/Carnegie Institution for Science) At a Glance The dwarf planet was discovered in 2015, but wasn't unveiled until this week. The icy world is just 186 miles across and takes 40,000 years to circle the sun. A tiny dwarf planet nicknamed "the Goblin"has been spotted orbiting the far reaches of our solar system. The dwarf planet, formally TG387,was discovered in 2015around Halloween (hence the spooky...

At a Glance Chengdu, a city in southwest China, wants to launch an illumination satellite in 2020.The artificial moon would be eight times brighter than the real moon.Some fear the plan could add to the problem of light pollution. A city in southwestern China has announced an unusual plan to illuminate city streets that seems more sci-fi than science. Chengdu, capital of the Sichuan province, plans to the People's Daily Online reports. The Chinese newspaper said Wu Chunfeng, chairman of...

An extremely rare lunar meteorite was sold at auction for a whopping $612,000. ...