Astronomers believe the solar system once had nine planets - and the sun ate one of them

The status of Pluto not withstanding, our solar system has 8 planets, but one astronomer believes we used to have a ninth ...

Is there actually a ninth planet in our solar system? Here's what we know

The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there ...
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Jupiter designed the solar system. Here's what the planet was like as a child.

Jupiter, the largest planet in the solar system, was 2 to 2.5 times bigger in its earlier life, according to new research. Credit: NASA / JPL-Caltech / SwRI / MSSS / Tanya Oleksuik Jupiter, the ...