NASA/Johns Hopkins APL/Steve Gribben Around 15 percent of near-Earth asteroids have small moons, which suggests binary systems are fairly common. Many of the larger asteroid pairs have likely formed ...

Among the strangest branches of the dinosaur family tree are the alvarezsauroids, small, bird‑like theropods that lived from the Jurassic into the Cretaceous. They don’t fit the image of sharp‑toothed ...

Wrinkle structures are small ridges and pits in rock, often made by microbial mats. They’re best known from Precambrian and Cambrian strata, where they serve as important evidence of early life, and ...