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

Known as the "Parade of Planets," the celestial event will feature appearances from Mars, Jupiter, Uranus, Venus, Neptune and ...

Planets with suns like Wolf 359 are subject to huge blasts of radiation that raise questions about their long-term ...

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...

If we find one specifically orbiting a circumbinary planet, this may be a tremendous ... though far outside of our sun's habitable zone. If worlds like these exist within our own solar system ...

It actually follows its own tiny elliptical orbit around what is called the center of gravity (the barycenter) of the system, the sun and the orbiting planets. This barycenter is usually not equal ...

However, none of the planets orbiting the sun have perfectly circular orbital paths and the paths don't even lie on the same plane. Compared with Mercury, the paths of the four outer giant planets ...

To retain vast oceans similar to Earth, the planet would have to be about 10 AU away, or roughly the distance of Saturn from the sun. The second ... Generation Planets Orbiting White Dwarfs ...

You won't have to wait long for all six planets to be in the sky. They'll be there as soon as the sun sets. Once it's dark, you'll only have a couple of hours to view them before Venus ...