Solar system 'could contain ten or more planets', say scientists
New study suggests 'Planet Nine' could actually be one of several different worlds far beyond Pluto

The solar system may actually hold ten or 11 planets, according to a new study which poses questions for the researchers who detected evidence of "Planet Nine" earlier this year.
In January, Konstantin Batygin and Mike Brown from the California Institute of Technology (Caltech) claimed there was an icy world far beyond the dwarf planet of Pluto and believed to be up to four times as large and ten times as massive as Earth.
The astronomers inferred its existence from the movement of other objects in the solar system. Unusual movement of six large objects in the Kuiper belt suggested they were being influenced by the gravitational effects of a hidden planet.
Subscribe to The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.

Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
Now those orbits have led scientists from Cambridge University and Spain to believe there could also be a Planet Ten and even Eleven, reports the Daily Telegraph.
Sverre Aarseth, from the Institute of Astronomy at Cambridge, and Spanish astronomers Carlos and Raul de la Fuente Marcos say the orbit of Planet Nine does not match up with the orbits of the Kuiper belt objects and so there has to be more large planets influencing them.
"We believe that in addition to a Planet Nine, there could also be a Planet Ten and even more," said Carlos de la Fuente Marcos.
However, not everyone is convinced by the findings.
"I think it's way too early to start speculating about a second planet but, in general, I am confused by their results," Caltech's Brown told the Daily Mail.
"We have a nearly identical analysis which shows nearly the opposite result. It is not obvious to me why they would get such a different answer."
Sign up for Today's Best Articles in your inbox
A free daily email with the biggest news stories of the day – and the best features from TheWeek.com
-
Gaza is running out of cash
Under The Radar Palestinians pay the price as black market springs up around banknotes and coins
By Elizabeth Carr-Ellis, The Week UK Published
-
Law firms: Caving to White House pressure
Feature Trump targets major law firms tied to his past investigations
By The Week US Published
-
Venezuelan deportees: Locked up for tattoos?
Feature A former pro soccer player was deported after U.S. authorities claimed his tattoo proved he belonged to a Venezuelan gang
By The Week US Published
-
'Like a sound from hell': Serbia and sonic weapons
The Explainer Half a million people sign petition alleging Serbian police used an illegal 'sound cannon' to disrupt anti-government protests
By Abby Wilson Published
-
The arrest of the Philippines' former president leaves the country's drug war in disarray
In the Spotlight Rodrigo Duterte was arrested by the ICC earlier this month
By Justin Klawans, The Week US Published
-
Ukrainian election: who could replace Zelenskyy?
The Explainer Donald Trump's 'dictator' jibe raises pressure on Ukraine to the polls while the country is under martial law
By Sorcha Bradley, The Week UK Published
-
Why Serbian protesters set off smoke bombs in parliament
THE EXPLAINER Ongoing anti-corruption protests erupted into full view this week as Serbian protesters threw the country's legislature into chaos
By Rafi Schwartz, The Week US Published
-
Who is the Hat Man? 'Shadow people' and sleep paralysis
In Depth 'Sleep demons' have plagued our dreams throughout the centuries, but the explanation could be medical
By The Week Staff Published
-
The New Jersey 'UFO' drone scare
In the Spotlight Reports of mysterious low-flying aircraft provoked outlandish theories, but old-fashioned hysteria appears to have been to blame
By The Week UK Published
-
Why Assad fell so fast
The Explainer The newly liberated Syria is in an incredibly precarious position, but it's too soon to succumb to defeatist gloom
By The Week UK Published
-
Romania's election rerun
The Explainer Shock result of presidential election has been annulled following allegations of Russian interference
By Sorcha Bradley, The Week UK Published