Under the sea ice during the Arctic’s pitch-black polar night, cells power photosynthesis on the lowest light levels ever ...

A polar day is when the sun does not set and stays above the horizon for an extended period, while a polar night is when the sun never rises above the horizon. These phenomena are ...

Step out onto an ice floe in the middle of the Arctic Ocean, and watch and listen as scientists race the fading light to set up one of the most ambitious international climate collaborations ever, ...

RELATED: Everything you need to know about the polar vortex bringing extreme cold ... snow that will let up Sunday and return Sunday night. Barjenbruch said people working outdoors this weekend ...

During these times, it's referred to as a polar night. The opposite, polar day, occurs when there is 24-hour daylight. A polar day is when the sun does not set and stays above the horizon for an ...