But no additional large planets have been found at the edge of our solar system. New calculations by astronomers in Spain and the UK suggest that not one, but two unknown planets might exist in our solar system, beyond Pluto’s orbit. Artist’s illustration of a view of our sun from an unknown outpost planet at the fringes of our solar system. Image via NASA/JPL-Caltech.
http://earthsky.org/space/two-or-more-planets-beyond-pluto
Secret worlds thought to exist beyond the orbits of Neptune and Pluto. An artist impression of one of the two as-yet undiscovered planets as big as Earth or larger may be hiding in the outer fringes of the Solar System Photo: PA.
http://www.telegraph.co.uk/news/science/space/11353917/At-least-two-more-planets-beyond-Pluto-scientists-say.html
Two planets beyond Pluto? New calculations by astronomers in Spain and the UK suggest that not one, but two unknown planets might exist in our solar system, beyond Pluto’s orbit. Artist’s illustration of a view of our sun from an unknown outpost planet at the fringes of our solar system.
http://earthsky.org/space/two-or-more-planets-beyond-pluto
Astronomers in Spain believe Pluto (pictured) has yet another unusual feature - the world may be harbouring two supersized planets just out of reach of our telescopes. Researchers at the Complutense University of Madrid have found some strange patterns in the rocky objects around Pluto.
http://www.dailymail.co.uk/sciencetech/article-2657158/Are-two-giant-planets-lurking-Pluto-Unusual-orbits-spotted-outer-solar-hint-presence-large-worlds.html
NASA and the team behind its New Horizons spacecraft announced today that Pluto — the dwarf planet — has a giant tail. It's not a physical tail like a dog's, of course, but rather a frigid cloud of ionized gases trailing an estimated 48,000 to 68,000 miles behind Pluto, according to a NASA press release. This giant tail is actually part of Pluto's atmosphere. Except that the bits of atmosphere are being stripped away by solar wind, a torrent of electrically charged particles that constantly pours out of the sun in all directions.
http://www.businessinsider.com/pluto-dwarf-planet-ion-gas-tail-nasa-new-horizons-2015-7
Because Pluto is such a tiny planet — it's a fraction of a percent as massive as the Earth — its atmosphere escapes directly into space, Gladstone said. Gladstone and others discovered the tail after examining data from the Solar Wind Around Pluto (SWAP) instrument on the New Horizons spacecraft. The device found an anomaly in the solar wind around the dwarf planet: A depression composed of nitrogen ions.
http://www.businessinsider.com/pluto-dwarf-planet-ion-gas-tail-nasa-new-horizons-2015-7
But, so far, no large planets beyond Pluto have been found. The new calculations – from the Complutense University of Madrid (UCM, Spain) and the University of Cambridge (UK) – are based on the orbital behavior of known objects at our solar system’s fringes.
http://earthsky.org/space/two-or-more-planets-beyond-pluto
Publications such as the New York Times have called Pluto the last of known worlds to be explored and the end of an era of planetary exploration.. Alan Stern, principal investigator of the New Horizons mission, has called the mission the last picture show..
http://www.cbc.ca/news/technology/beyond-pluto-5-things-left-to-explore-in-our-solar-system-1.3167012
Secret worlds thought to exist beyond the orbits of Neptune and Pluto. At least two as-yet undiscovered planets as big as Earth or larger may be hiding in the outer fringes of the Solar System, scientists believe. The secret worlds are thought to exist beyond the orbits of Neptune, the furthest true planet from the Sun, and the even more distant tiny ''dwarf planet'' Pluto. The evidence comes from observations of a belt of space rocks known as ''extreme trans-Neptunion objects'' (Etnos).
http://www.telegraph.co.uk/news/science/space/11353917/At-least-two-more-planets-beyond-Pluto-scientists-say.html
1. Eris, the most massive object after the eight planets, and other Kuiper Belt kin. New Horizons showed that Pluto is the largest object in the outer region of the solar system known as the Kuiper Belt. A Kuiper Belt object called Eris, discovered in 2005, was previously thought to have a wider diameter than Pluto. That was one of the main reasons for Pluto's demotion from planet to dwarf planet in 2006.
http://www.cbc.ca/news/technology/beyond-pluto-5-things-left-to-explore-in-our-solar-system-1.3167012
what's beyond pluto
Two unknown planets might exist in our solar system, beyond Pluto’s orbit.