However, it was not until Kepler's observations that the planets followed elliptical orbits around the sun (rather than circular orbits) that astronomical models matched observations of the ...

The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

Earth has a nearly circular orbit, but some planets outside our solar system, called exoplanets, have very elliptical orbits.

The Earth is our planet. It is one of eight planets that move around the sun, each in an oval shaped, elliptical orbit close elliptical orbitAn orbit that is the shape of an ellipse. An ellipse is ...

The Milky Way is known to host a diverse array of planetary systems, providing astronomers with extensive insights into how ...

An exciting first in planetary discoveries!

Here’s a little spoiler for next month’s Cosmic Calendar: early May will see the return of the Eta Aquarid meteor shower. The ...

We know that planets don’t just orbit their star in the same place forever. Over time, planetary orbits can shift because of the combined gravitational influences of other planets in a system.

Astronomers have found a planet that orbits at an angle of 90 degrees around a rare pair of peculiar stars. This is the first time we have strong evidence for one of these 'polar planets' orbiting a ...