For the first time, astronomers have directly measured the mass of a rogue planet, a celestial body wandering through space without a star. The object, comparable in size to Saturn, was studied ...

A rare alignment of two exoplanets with their star, marking one of the few known exosyzygies, an astronomical event involving celestial bodies outside our solar system, is expected to occur. Despite ...

Stephen Kane, a professor of planetary astrophysics at UC Riverside, was skeptical when he read recent studies that showed the gravitational pull from Mars being connected to Earth’s long-term climate ...

Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the discovery of Pluto in the 1930s. Labeled as planet X, prominent astronomers ...

Root explores how Earth’s gravity field is constantly changing and what these variations reveal about our planet ...

Step outside just after sunset and you may catch an unusual sight: six planets strung across the sky in a gentle arc. The phenomenon—often dubbed a “planetary parade”—isn’t a cosmic spectacle in the ...

Mercury, Saturn, Mars, and Neptune will compactly align in the sky on the morning of April 18 in an event astronomers call a planetary alignment. While the peak viewing hours of the alignment are on ...