When we look up at the night sky, why do we see the Moon's appearance changing over time from a full sphere to a crescent to nothing at all? Find the answers in this interactive resource adapted from the National Air and Space Museum.

This resource, which is provided for by NASA, gives great information on protecting your eyes during solar eclipses. Your eyes are very difficult to replace. Even when 99% of the Sun's surface is obscured during the partial phases of a...