Planet 9 is the hypothetical ninth planet in our Solar System. Has it finally been found using IRAS and AKARI mission data?

Taiwanese scientists have re-analyzed data from previous space observations and identified a celestial body that could be the hypothesized ninth planet in the Solar System — Planet Nine. If this ...

Our solar system has two ice giants, Uranus and Neptune, but there may have been a third. According to a new study published in the journal Icarus, this extra world might have triggered a violent ...

Several decades ago, we thought the solar system had nine planets. Then Pluto was reclassified as a dwarf planet. And then astronomers realized the solar system is full of dwarf planets. Recent ...

Pluto is now the most well known of the outer worlds beyond Neptune—and the darling of the solar system Kayla Randall | Digital Editor, Museums A 24-year-old observatory assistant from the Midwest ...