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

Here’s what you should know when you go outside to see for yourself: Yes, the planets are indeed lined up across our sky. No, ...

1 AU is the average distance between the Earth and the Sun and is approximately equal to 150,000,000 km (or 1.5 × 10 11 m). Distances between the Earth and other stars and galaxies are measured ...

Beyond Neptune lies the Kuiper Belt, a vast expanse of icy bodies that may hold clues to the solar system’s formation. These ...

Using numerical simulations, the researchers figured out that a flyby like this would have about a 1 in 100 chance at reshaping our Solar System into what it is today, and that the interloping ...

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

planets in our Solar System and other planets far off in outer space. From up here on the International Space Station I get a great view of Earth. Our planet is just the right distance from the ...

Opinions expressed by Forbes Contributors are their own. Jamie Carter is an award-winning reporter who covers the night sky. Computer simulations suggest that there is an undiscovered Earth-like ...