The possible surface of TRAPPIST-1f, one of seven newly discovered planets in the TRAPPIST-1 system that scientists using the Spitzer Space Telescope and ground based telescopes have discovered. NASA/JPL-Caltech
An artist's concept depicts select planetary discoveries made so far by NASA's Kepler space telescope. Courtesy W. Stenzel/NASA
An imagined view of the three planets orbiting an ultracool dwarf star just 40 light-years from Earth discovered using a specialist telescope at ESO's La Silla Observatoryin Chile. ESO/M. Kornmesser/N. Risinger
A view of the surface of the planet Proxima orbiting the red dwarf star Proxima Centauri, the closest star to our Solar System. ESO/M. Kornmesser/Handout via Reuters
An illustration compares Earth to a planet beyond the solar system that is a close match to Earth, called Kepler-452b. The planet, which is about 60 percent bigger than Earth, is located about 1,400 light years away in the constellation Cygnus....more
The planet Kepler-186f, the first validated Earth-size planet to orbit a distant star in the habitable zone, which is a range of distance from a star where liquid water might pool on the planet's surface. The discovery is the closest scientists have...more
A planet-like object dubbed Sedna, a small icy body far beyond Pluto and the Kuiper Belt, a discovery that calls into question exactly what was going on during the early days of the solar system. REUTERS/NASA/JPL-Caltech
Dwarf planet Ceres is seen in the main asteroid belt between the orbits of Mars and Jupiter. Ceres, one of the most intriguing objects in the solar system, is gushing water vapor from its frigid surface into space, in a finding that raises questions...more
An artist's impression shows a sunset seen from the super-Earth Gliese 667 Cc. Astronomers have estimated there are tens of billions of such rocky worlds orbiting faint red dwarf stars in the Milky Way alone. REUTERS/ESO/L. Calcada
A view of a Saturn-sized planet orbiting 79 Ceti. REUTERS/Stringer
An artist's depiction of Kepler-62e. The super Earth-size planet is in the habitable zone of a star smaller and cooler than the sun, located about 1,200 light-years from Earth in the constellation Lyra. REUTERS/NASA Ames/JPL-Caltech
Kepler-22b, the most Earth-like planet ever discovered, is circling a star 600 light years away. It is the smallest and the best positioned to have liquid water on its surface - among the ingredients necessary for life on Earth....more
A newly discovered planet, designated by the unglamorous identifier of OGLE-2005-BLG-390Lb, orbits a red star five times less massive than the Sun and located at a distance of about 20,000 light years. REUTERS/ESO
An artist's impression shows the planet orbiting the star Alpha Centauri B, a member of the triple star system that is the closest to Earth. Our own Sun is visible to the upper right. REUTERS/ESO
The Jupiter-size extrasolar planet, HD 189733b, being eclipsed by its parent star. The planet is a 'hot Jupiter', so close to its parent star that it completes an orbit in only 2.2 days. REUTERS/ESA/NASA/M. Kornmesser (ESA/Hubble)/STScI.
An artist's conception of the tiny new planet Kepler-37b, which is slightly larger than Earth's moon and orbits its host star every 13 days. It likely has a surface temperature of in excess of 400C (700F). Astronomers don't think the tiny planet has...more
Kepler-11, a sun-like star around which six planets orbit. At times, two or more planets pass in front of the star at once, as shown in a simultaneous transit of three planets. REUTERS/Tim Pyle/NASA
The first visible-light snapshot of a planet circling another star. Estimated to be no more than three times Jupiter's mass, the planet, called Fomalhaut b, orbits the bright southern star Fomalhaut, located 25 light-years away in the constellation...more
A baffling planet, known as HAT-P-1, that is much larger than theory predicts. The planet has a radius about 1.38 times Jupiter's but contains only half Jupiter's mass. REUTERS/David A. Aguilar
A rich starry sky fills the view from an ancient gas-giant planet in the core of the globular star cluster M4. The 13-billion-year-old planet orbits a helium white-dwarf star and the millisecond pulsar B1620-26, seen at lower left. The globular...more
The circumbinary planet Kepler-16b - the first planet known to definitively orbit two stars. The cold planet, with its gaseous surface, is not thought to be habitable. The largest of the two stars, a K dwarf, is about 69 percent the mass of our sun,...more
Planet 2003UB313, the most distant object ever detected orbiting the sun, at the lonely outer fringes of our solar system. Our sun can be seen in the distance. The planet is at least as big as Pluto and about three times farther away from the Sun...more
A Jupiter-sized planet passing in front of its parent star. Such events are called transits. When the planet transits the star, the star's apparent brightness drops by a few percent for a short period. REUTERS/NASA/ESA/G. Bacon
The planet Kepler-16b with its two stars. The cold planet, with its gaseous surface, is not thought to be habitable. The largest of the two stars, a K dwarf, is about 69 percent the mass of our sun, and the smallest, a red dwarf, is about 20 percent...more
A unique type of exoplanet discovered with the Hubble Space Telescope. The planet is so close it to its star that it completes an orbit in 10.5 hours. The planet is only 750,000 miles from the star, or 1/130th the distance between Earth and the Sun....more
A fledgling solar system containing deep within it enough water vapor to fill all the oceans on Earth five times, located in our Milky Way galaxy about 1,000 light years from Earth in the constellation Perseus. REUTERS/NASA/JPL-Caltech
Islamic State tunnels discovered by Iraqi forces.
Security footage of the events leading up to the death of the estranged half-brother of North Korean leader Kim Jong Un at Kuala Lumpur International Airport.
This week marks the 75th anniversary of FDR signing executive order 9066, authorizing the internment of Japanese-Americans during World War Two.
Two Islamic State militants captured in Kirkuk, Iraq, one of whom claimed he raped hundreds of women and killed hundreds more, now spend their days in tiny jail...