Why do the planets in the solar system orbit on the same plane? Therefore, astronomers might expect that all of the planets in the solar system would spin in the same direction as the sun.

The sun's distance ... discovery has more to do with the observation of orbits of other planets. "In about 1604, Johannes Kepler fitted an ellipse model of Mars' orbit to observations of Mars ...

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

That puts it only slightly farther than Mars' current orbit of 1.5 AU from the sun. The simulations show that just one substellar object flyby was sufficient to alter the giant planets' trajectories.

Throughout January, six planets will line up in the night sky, with tonight offering the best chance of viewing the ‘planet ...

We explore how long it takes to get to Mars and the factors that affect a journey to the Red Planet ... Mars requires longer to orbit the sun than the Earth does. All of this is taken into ...

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

The mysterious planet Nibiru has fueled apocalyptic theories, from a potential Earth collision to links with ancient aliens.

Mars, Venus, Jupiter, Saturn, Uranus and Neptune will appear together in a row throughout the start of February – although Neptune and Uranus will only be visible with binoculars or a telescope.

Have you heard of the “planetary parade” that’s happening in the night skies? For much of January and February, you have the chance to see six planets in our solar system after dark ...

“If you had a really good spaceship and you could shoot yourself way out and ... the other four planets are bright enough to be spotted when the sun has set. When and where do you look?