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

Six of our cosmic neighbors are expected to line up across the night sky tonight, in what has been dubbed a "planetary parade ...

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you ...

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of ...

Four planets will shine brightly in a line each evening in January through mid February. But it's not a "planetary alignment" ...

The permanent exhibit takes visitors on an interplanetary journey of our solar system. Stations are located throughout the campus and feature details about each planet, star, or asteroid.

For decades, astronomers have debated how the solar system's planets formed ... the team carried out 50,000 simulations of such flybys, each over 20 million years, while altering certain ...