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2007 OR10: the largest unnamed world in the solar system

By combining data from two space observatories, astronomers have revealed something surprising: a 955-mile-wide dwarf planet named 2007 OR10 is significantly larger than previously thought. Although its 547-year-long elliptical orbit brings it nearly as close to the Sun as Neptune, 2007 OR10 is currently twice as far from the Sun as Pluto.

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Searching for distant and wandering worlds

In a global exoplanet observation experiment, NASA’s Kepler K2 mission and Earth-based observatories on six continents hope to survey millions of stars toward the centre of our Milky Way galaxy. Using a technique called gravitational microlensing, scientists will hunt for exoplanets that orbit far from their host star and for free-floating exoplanets that wander between the stars.

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New Horizons finds possible ice volcanoes on Pluto

From possible ice volcanoes to twirling moons, NASA’s New Horizons science team is discussing more than 50 exciting discoveries about Pluto at this week’s 47th Annual Meeting of the American Astronomical Society’s Division for Planetary Sciences. The two cryovolcano candidates are large features measuring tens of miles across and several miles high.

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Latest New Horizons images of Pluto and Charon delight and amaze

New close-up images of Pluto from NASA’s New Horizons spacecraft reveal a bewildering variety of surface features that have scientists reeling because of their range and complexity. Images downlinked in the past few days reveal new features as diverse as possible dunes, nitrogen ice flows oozing out of mountainous regions onto plains, and even networks of valleys possibly carved by material flowing over Pluto’s surface.

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A “heart” from Pluto as New Horizons’ flyby begins

Now just five days away from its close encounter with dwarf planet Pluto, NASA’s New Horizons spacecraft beams back the first image to be received since the 4 July anomaly that sent the spacecraft into safe mode, indicating that all systems appear to be functioning normally. The flyby sequence of science observations is officially underway.