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How to tell a comet from an asteroid and a meteor from a meteorite

A field guide to the space rocks you might see streaking across the night sky

NASA prepares to launch an unprecedented mission to save a dying space telescope

Inside the quest to rescue NASA's aging Swift observatory

Gene-editing startups are using CRISPR to treat diseases

A handful of start-up firms are testing therapies that target specific epigenetic markers to treat everything from high cholesterol to a rare muscular disorder

Turtles Are Really Weird Animals. Where Did They Come From?

SARA NOVAK

The origin of turtles has puzzled scientists. A new study provides more evidence that these shelled reptiles share a common ancestor with crocodiles and birds.