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

Finding a world like Earth elsewhere in the universe might mean looking for the right kind of solar system. A new discovery ...

The seven planets will not be perfectly aligned, but will appear in an arc across the sky due to their orbital plane in the ...

January started out with a meteor shower and now has a planetary alignment in store. Here's what you'll be able to see and ...

Six planets of our solar system would form a beautiful arc as they align in the same area producing a spectacular view that ...

HD 20794 d completes its orbit just shy of two Earth years, placing it well within reach of conditions that might harbor life ...

This occurs when the planets' positions in their elliptical orbit around the sun line make them seem like they are close in ...

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

Planetary alignments aren't rare, but they can be when they involve six of the eight planets in our solar system.

Astronomy fans know 2025 kicked off with a meteor shower, but another big spectacle is coming up that should be on your radar, too. Here’s what to look forward to and how to watch ...