When the sun is visible in the polar sky, it appears to move in a horizontal circle above the horizon.

In midwinter, the polar sky is lighted only by stars and the flickering aurora, and the warming sun never appears.

Robert, his 37-year-old face tanned from too long under harsh polar skies, is full of praise for his new bride.

Snow begins to fall from the polar skies as Santa says, "Girls, you are both wise.

For more hours they flew through polar skies.

Again Tom began combing the polar sky.

As the great silver ship streaked through the polar sky en route to the enemy camp, Tom's nerves were calm and steady.

Glass igloos at Kakslauttanen offer a perfect window on the polar sky.

It is a safer time to travel through space, but a less interesting time to watch polar skies.

It was a breathtaking display, like aurora in a polar sky, like reflections in a sea grotto.