The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

Outreach Coordinator Shea Harris said it is an accurate model of the solar system, at one ten-billionth of its actual size. “It kind of gives you a feeling of how big our solar system is as you ...