Learn how concave mirrors form images with a clear, step-by-step explanation that makes the mirror equation easy to ...

The best time to hunt for Ursid meteors is from the evening of Dec. 21 straight through to dawn on Dec. 22. The shower's peak ...

Step aside, Van Gogh. Some spiders are out here making self-portraits for survival. New research shows that several orb-weaving species construct giant web-mounted “doppelgängers” convincing enough to ...