This puzzle will put your eyesight to the ultimate test as it challenges you to spot an airplane that has seemingly ...

On a clear, sunny day, the sky above us often glows a brilliant blue, a sight so commonplace ... When the Sun is low on the horizon, its light must pass through a thicker layer of the atmosphere.

but the other planets will linger in the night sky. For the best view, head to a location with minimal light pollution and a clear view of the horizon. Clear skies will also be necessary to see ...