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The planets in the Solar System are all different but we can divide them into groups based on their common features. There are two ice giants (Uranus and Neptune) which are so far from the Sun ...

And what if nothing shows up at all? It would still be useful to know for sure how many planets there are, Rice said. “I think not even knowing the number of planets in our own solar system is ...

It must have cleared all other celestial bodies, except its own moons, from its orbit.

In fact, every planet—and every moon—in the solar system will be in the sky during the eclipse. However, that doesn’t mean you’ll see them all. Contrary to what you might have read ...

Why does Jupiter look like it has a surface – even though it doesn’t have one? – Sejal, age 7, Bangalore, India ...

If Voyager 2 had arrived a week earlier, it would have observed a completely different magnetospheric environment".

They comprise almost half of all rocky exoplanets ... look at how these planets’ molten oceans affect their size and evolution. There is no lava world in the solar system. The closest analog ...

It would depend on a lot, say our readers, from how big it was to the route it took - but it could have significant ...

Astronomers are investigating the possibility of a hidden ninth planet beyond Neptune, which could explain unusual orbital patterns in the Kuiper Belt.