Space

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Pluto may be a planet: Your childhood is once again complete
Pluto may be a planet: Your childhood is once again complete By IanHoppe October 06, 2014 The Harvard-Smithsonian Center for Astrophysics held a debate a couple of weeks ago
David Blanchflower BSc on Twitter
Best version of the Charon picture. Image credit: NASA/JHUAPL/SwRI.
Only 15 minutes after its closest approach to Pluto on July 14, 2015, NASA’s New Horizons spacecraft looked back toward the sun and captured this near-sunset view of the rugged, icy mountains and flat ice plains extending to Pluto’s horizon. The smooth expanse of the informally named icy plain Sputnik Planum (right) is flanked on the left by rugged mountains up to 11,000 feet (3,500 meters) high, including the informally named Norgay Montes in the foreground and Hillary Montes on the skyline...
APOD: 2014 April 19 - Earth-size Kepler-186f
Kepler-186f ~ The first known Earth-size planet to lie within the habitable zone of a star beyond the Sun. Discovered using data from the prolific planet-hunting Kepler spacecraft, the distant world orbits its parent star, a cool, dim, M dwarf star about half the size and mass of the Sun, some 500 light-years away from us, in the constellation Cygnus. While the size and orbit of Kepler-186f are known, its mass and composition are not, and can't be determined by Kepler's transit technique. (N...
bt-images.net
The sky (or celestial dome) is everything that lies a certain distance above the surface of the Earth, including the atmosphere and outer space.