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

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

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

Chennai: If you spotted six planets in a row in Jan, try your luck again at this month-end as Mercury will also be visible.

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.

Stargazers will be treated to a dazzling six-planet "alignment" this January.

Baker said that there are other astronomical events that may be more interesting than the parade of planets. Baker said Mars ...

Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you ...

A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by warping the orbits of the four outer planets, a new study suggests. The ...