Astronomers have long relied on two main methods to detect exoplanets—the transit method, which looks for dips in a star’s ...

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, ...

During late January and into February, six planets are moving in their orbits into our southern sky, visible each evening. This type of event is not rare, though often misunderstood. Popular media is ...

You'll get access to an ad-free website with a faster photo browser, the chance to claim free tickets to a host of events (including everything from Summerfest to the Milwaukee Film Festival), access ...

ISRO launched its 100th mission today with a GSLV rocket. The mission carried a second-generation satellite for India's ...

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

About 100 years after astronomer Edwin Hubble's discovered the "magnificent" spiral nebula, the Hubble Space Telescope and ...

Michigan State University and NASA researchers discover seven dark comets that reveal new solar system secrets.

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

Because the period of an object does not depend on its mass, comets’ orbital periods remain unchanged due to mass loss.

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.

The two satellites weighing 220 kilograms (485 pounds) each were blasted into orbit on a single rocket in December and sent into slightly different orbits. On Thursday, they were maneuvered back ...