Polar night is the opposite of midnight sun, when none of the Sun's disc is visible above the horizon at all. It only happens within the polar circles. Arctic areas on Earth's day side do not receive any sunlight around the December solstice, resulting in polar night within the Arctic C...
low value and zero value would briefly appear pink or blue before fading.Volunteers had to drag them to either the pink side or the blue side of the screen later.They had to remember which side of the screen to drag the circles to in order to earn points.In some of t...