As the largest planet in the solar system ... it is specifically called the rotational period. Just in case you're referring to this kind of period instead to the orbital period, the rotational period ...

A planet thus formed continuing to revolve ... the fact that the moon always turns the same face toward the earth, and that the rotation period of Mercury (and probably that of some of the ...

A rare celestial event is set to take place this month, offering an eerie glimpse at a grouping of planets in total alignment. Just days after the Wolf Moon – the first full moon of 2025 ...

High radiation during a time of frenzied star formation in the Milky Way left one stellar population with few chances to form planets, a study reports.

The story of Earth’s atmospheric oxygenation is one of transformation, shaped by both biological and planetary forces. While scientists have long debated the causes behind the stepwise rise of oxygen, ...

Opinions expressed by Forbes Contributors are their own. Jamie Carter is an award-winning reporter who covers the night sky. A single rotation of our planet takes 24 hours and constitutes a day.

Photograph by Garcia Julien, Getty Images We also enjoy protection from Earth's magnetic field, generated by our planet's rotation and its iron-nickel core. This teardrop-shaped field shields ...