A once-in-a-lifetime comet is approaching the sun — and it will be visible for the first time in 160,000 years. The comet ...

Polar days and polar nights occur in locations within the Arctic and Antarctic Circles. A polar day is when the sun does not set and stays above the horizon for an extended period, while a polar night ...

In the north, summer is on the horizon. The Earth rotates the Sun on a tilt - at an angle of 23.5 degrees. This tilt gives us our seasons and, twice a year, our solstices. Yes, although obviously ...