Shadow bands are elusive ripples of alternate light and dark, flitting over the ground or the sides of buildings. How to take part in an International Shadow Band Campaign during the August 21 eclipse.
A first-of-its-kind stamp that changes when you touch it. It'll commemorate the total solar eclipse of August 21, 2017. Fred Espenak - whose photos are used on the new stamp - tells the story.
Now for something entirely different. This image isn't an artist's illustration. It's a real time-lapse sequence of images - acquired by the Hubble Space Telescope - of the tiny moon Phobos orbiting Mars. Cool! Click here for the video.
