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 ...
Yahoo

What are dwarf planets — and how many are there?

In 2006, Pluto was famously demoted from a planet to a dwarf planet. It remains the most famous dwarf planet today, but there are others in our solar system, including potentially hundreds that ...
Phys.org

One of our planets may be missing, and it could explain why the solar system looks the way it does

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 ...
Smithsonian Magazine

Scientists Say That Jupiter—the Solar System’s Largest Planet—Might Be Slightly Smaller Than Previously Thought

The updated measurements won't take away Jupiter's status as the solar system's biggest planet. NASA / JPL-Caltech / SwRI / MSSS Scientists may have been overestimating the size of the solar system’s ...