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

Every object in our Solar System is held in place by the Sun’s gravitational pull. The planets in the Solar System are all different but we can divide them into groups based on their common ...

A 3D map of our cosmic neighborhood has revealed hot and cold regions as well as an "escape tunnel" from our local bubble.

In fact, every planet—and every moon—in the solar system will be in the sky during ... “It will not get dark enough to see all our planetary neighbors,” said French.

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".

this is all just speculation. James Unwin: If we do do our searches and it turns out that there is a planet in the outer solar system, this would be an absolutely incredible discovery. Such a ...

Computer simulations of the gravitational interactions of solar system bodies suggest that a hypothetical Earth-like planet explains all of those ... could revolutionize our theories about how ...

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

we say that the planet Neptune ... scale a circle two and a half miles in diameter would include all the members of our solar system; but on this scale the nearest fixed stars would be nearly ...