Finding planets used to be a painstaking business. Astronomers would fix their gaze on a handful of carefully chosen stars, ...

For several days this month, Saturn, Mars, and Mercury appear just degrees apart before sunrise—close enough to watch their changing geometry night by night.

The celestial body’s status as the solar system's ninth planet was withdrawn in 2006. Now some experts say we might want to ...

A strange planetary system called TOI-201 is changing in real time, with three very different worlds pulling on each other.

For those who enjoy viewing the night sky, a unique opportunity is just around the corner late this month. Six planets in the solar system are going to align in the western sky just after sunset.

The global climate has changed drastically over the course of the 58 years that separate these two photographs of planet Earth.

A rare celestial event will be taking place in the sky above California on Saturday night, as six planets are expected to be visible in what is being called a "planetary parade." Look towards the ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. A planet parade — mistakenly called a planetary alignment by ...

This is a brilliant question because the notion of an orbit is counterintuitive. We know that massive objects (really, any objects with mass) gravitationally attract other massive objects; Newton’s ...