Space-based solar power. Illustration of satellites harvesting energy from sunlight and beaming it down to Earth, perhaps via microwaves. Such satellites would likely be in highly elliptical orbits, ensuring that they stayed above the same hemisphere...

Space-based solar power. Illustration of satellites harvesting energy from sunlight and beaming it down to Earth, perhaps via microwaves. Such satellites would likely be in highly elliptical orbits, ensuring that they stayed above the same hemisphere...

The white dwarf WD1054-226 exhibits a constant stream of transits by debris and or dust in orbit about it, with an underlying period of 25.02 hours. Astronomers believe that the material orbits within the star's habitable zone, where the temperature ...

Astronomers from Oxford University in the UK have observed this rocky exoplanet covered in an ocean od water with substantial prozen deposits of carbon dioxide. The planet orbits a cool red dwarf....

Astronomers from Oxford University in the UK have observed this rocky exoplanet covered in an ocean od water with substantial prozen deposits of carbon dioxide. The planet orbits a cool red dwarf....

... consistent with capture than theft. Their results lend further credence to the notion that planets on more distant (>100 AU) orbits may not be orbiting their parent star. This image shows such a planet, orbiting a star that is not the one it was born ...

The Oort cloud is a vast, spherical region of space thought to surround the Sun, with a radius measured in thousands of astronomical units (1 AU being the Earth-Sun distance). Evidence for it comes from the orbits of long-period comets, which seem to...