When one celestial object passes in front of another, it can cast a shadow that travels across space – and sometimes across Earth. These moments of alignment, known as eclipses, occultations, and ...

Earth's shadow follows the planet as it orbits the sun. You can get a sense of its enormous, awe-inspiring size by seeing this silhouette cast on objects ranging from satellites to the moon.

Zero Shadow Day is a truly intriguing astrophysical phenomenon and a one-off chance to watch the sun and Earth interact with each other head-on. When the sun remains directly above during noon, ...