It used to be that there were nine planets in our solar system. Although some people claimed that somewhere, out there, was a mysterious tenth planet called “Planet X.” In 2006, the IAU reclassified Pluto, in a hotly contested move that left the solar …

Tatsächlich geistert der Planet X schon lange durch die Astronomiegeschichte. So kam in den 70er-Jahren der US-Astronom Tom van Flandern anhand von Bahnstörungen der Planeten Uranus und Neptun zu dem Ergebnis, es müsse einen zehnten …

Conspiracy theorists keep finding proof of alien life on Earth, but if you're going to be worried about deadly aliens causing a commotion on our planet then you'd have to look elsewhere – if only you could see that far. A huge alien force is believed …

Astrophysicists at the University of Bern have modelled the evolution of the putative planet in the outer solar system. They estimate that the object has a present-day radius equal to 3.7 Earth radii and a temperature of minus 226 degrees Celsius. How …

This so-called “Planet Nine” (or Planet X) that wasn't spotted until now, it's said to have an iron core surrounded by a silicate mantle. Above this mantle, there is a theory that it has an “icy” layer surrounded with hydrogen/helium. planet-x-planet-9 …

年初，有许多天文家预测太阳系第九大行星（Planet Nine或称为X行星，Planet X）或许真实存在，当然并不是指之前被降格的冥王星，而是另有所指一颗轨道十分遥远的巨大气态行星，质量应该在地球十倍左右，若其存在能够很大 …

Given that we can't even prove Planet Nine exists because we can't see it with any current tech, it's even more hard to find evidence of a Planet X that's supposedly wreaking havoc on Earth with regularity. Although we have extremely powerful …

The elusive Planet X, or Nibiru, with its unimaginably long 27-million-year orbit, is still only a theory to many. But one astrophysicist believes it spells doom for Earth. Nibiru's arrival this month, he says, will bring about a mass extinction of …

According to their theory, Planet 9, formerly known as Planet X before Pluto was demoted to dwarf planet status, is a rocky icy world shrouded in a thick layer of helium and hydrogen. Scientists have long suspected that an unknown planet may inhabit …

Ο πλανήτης Εννέα ή Planet X– ένας νέος πλανήτης που ανακαλύφθηκε στην άκρη του ηλιακού συστήματος τον Ιανουάριο, θα προκαλέσει βροχές κομητών που θα βομβαρδίζουν την επιφάνεια της Γης, σκοτώνοντας κάθε ζωή, αναφέρει ο Daniel Whitmire, του …