Astronomers have found giant remains of a massive cosmic collision beyond Neptune. The collision would have occurred between objects one of which would have been half the size of Pluto. These remains could one day cross the orbit of Neptune...

There is a world at the fringes of the solar system, a massive, cigar-shaped world. Astronomers have been exploring it for long. And their constant discoveries have been suggesting multiple moons that orbit many large, distant objects. But,...