The known universe is full of shockingly huge things. Here are the largest planets, stars, galaxies, and structures we've ...

Researchers are discussing 2025 PN7, a small celestial body that's following a similar orbital path to our planet's without being gravitationally tied to Earth ...

JWST data hints that Trappist-1e may have an atmosphere. More transits will test if this world could support liquid water. Recent observations with NASA’s advanced JWST telescope have revealed a ...

Saturn will put on a show for professional and backyard astromers alike, and be the brightest and closest it has been to Earth all year. On Sunday, Sept. 21, Saturn will be at opposition, meaning the ...

My favorite planet, besides the one I live on, is on the rise in the low eastern sky during evening twilight. It’s Saturn and ...

Summer is officially over September 22, at 2:19 p.m. Time to hang up the surfboard, deflate the beach balls, stow the grill, put away the Hawaiian shirts, and have a good cry. Naturally you're angry.

My favorite planet, besides the one I live on, is on the rise in the low eastern Pottsville sky during evening twilight. It’s ...

Dwarf planet 2023 KQ14, Ammonite, has a stable orbit that challenges the hypothesis of the mysterious Planet Nine.

From Newton’s falling apple to Einstein’s curved spacetime, our understanding of gravity has come a long way, yet this ...

The Earth stands alone in the solar system as a habitable world, as far as we know. But that doesn’t mean we don’t get visitors, most often in the form of (usually harmless) asteroids. Some even ...

Our planet has apparently had a small companion that went undetected for decades. What took so long to find it and why was it hidden?

Every year, the moon, Earth's reliable celestial companion for 4.5 billion years, is getting 1.5 inches away. The distance to ...