Learn how Roemer learned that light does take time to travel.
Astronomers are learning more about the brightening and dimming of stars.
Learn why you sometimes have glowing red eyes in photographs.
How do you know the sun didn't just explode? We aren't talking about the everyday, run-of-the-mill controlled explosion the sun is always doing, but a big boom.
Have you ever seen the Milky Way outside of a photograph?
Did you ever hear that blood is actually blue inside your body, but turns red instantly on contact with air? Learn more on this Moment of Science.
If you look at a bright lamp and then close your eyes, why can you still see the light?
We don't perceive color in our peripheral vision because we have no cones, which sense light frequencies, on the outer edge of our retina.
Investigators shine a light on crime scenes mysteries with the help of luminol—a luminescent chemical that reacts with blood.
Contact lenses bring objects into closer and clearer focus than glasses.