Learn more about the tiny crystalline dermal denticles, tooth-like scales that allow the blue shark to change colors.

Firefly Aerospace’s Blue Ghost lander photographed the Earth as it passed in front of the Sun on March 14. By Andrew Paul Published Mar 14, 2025 3:09 PM EDT Get the Popular Science daily ...

Firefly Aerospace’s Blue Ghost lunar lander successfully made a soft touchdown near an ancient volcanic feature on the moon’s near side early Sunday morning.