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

Uranus and Neptune are there too, technically, but they don't appear as 'bright planets'," NASA's Preston Dyches explained in a stargazing video guide. Stock illustration of all the solar system's ...

The planets in our solar system orbit the sun essentially along a line across the sky in a plane called the ecliptic. For that reason, planets in our Earthly sky always appear somewhere along a ...

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

Although the occurrence climaxed on Jan. 21 with a conjunction—close alignment—of Saturn and Mercury, the planetary parade ...

Take advantage of a special 6-7 planet alignment from Earth's perspective. Planets 'line up' in the skies over California in ...

Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

A planet parade is when several of our solar system's planets are visible in the night sky at the same time. There will be six planets visible this time around, including Venus, Mars, Jupiter ...

To better understand why the planets have variable compositions ... formation of the gas and ice giants in the outer solar system. This first-order model of planetary growth in the solar nebula ...

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known ...