Scientists using Juno report Jupiter is smaller than previously thought, enhancing understanding of its shape, interior density, gravitational field, and comparison to other gas giant planets ...

When I go to the doctor, they measure how big I am. They use a scale to check my weight. They find my height with a measuring tape. But nobody can put a planet on a scale. Or wrap a measuring tape ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course. When ...

For centuries our solar system was the only planetary system known to humans. We had no proof other worlds existed beyond those in our own cosmic backyard, and we imagined that if other planetary ...