The spherical shell known as the Oort Cloud is, for all practical purposes, invisible. Its constituent particles are spread so thinly, and so far from the light of any star, including the Sun, that ...
At a farm in Concord, Massachusetts, astronomers, sky watchers and others gathered in the dark on Tuesday night, hoping to spot something never seen before. "Comet Tsuchinshan-ATLAS is going to appear ...
China launched military drills involving fighter jets and warships to encircle Taiwan on Monday, aiming to send a "stern warning" to what it labels as "separatist" forces on the self-governing island.