The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

The European Southern Observatory's Very Large Telescope (VLT) imaged both of the planets directly, and PDS 70b has the ...

Wolf 359’s extreme radiation and frequent X-ray flares make life-sustaining atmospheres on nearby planets highly unlikely, ...

By tracing the corkscrew wobble of two stars as they move through the sky, the Gaia space mission has discovered one new ...

Does our Solar System have 9 planets or only 8? Astronomers have gone back and forth on that a lot, with Pluto now being classified as a dwarf planet. However, out beyond Neptune there could be ...

The zodiacal light shines in the evening as the Moon reaches Last Quarter and skims past Spica and Antares in the sky this ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...

Why is Pluto no longer a planet? Discover the real reason behind Pluto’s reclassification as a dwarf planet and the science that led to this change.

As the gatekeepers to the Kuiper Belt, Charon and Pluto are a unique double dwarf planet system ... Christy had been imaging Pluto with the USNO's 1.5-meter (4.9-foot) telescope.

In 2006, the International Astronomical Union (IAS) reclassified Pluto as a dwarf planet. That decision came several years after discovering the Kuiper Belt, a ring of icy and rocky objects 2.8 ...

The ESA’s Gaia mission mapped the positions and velocities of stars with extreme precision by measuring about one billion ...