Axios

NASA's InSight lander mission on Mars has ended after years of science and research, the agency said Wednesday.

Why it matters: The NASA mission spent more than four years collecting data and science unique to Earth's neighboring red planet.

Over 50 million people are on winter storm alerts as the frigid air is already slithering south of the Canadian border, closing in on virtually the entire Lower 48 east of the Rockies.

Threat level: The National Weather Service is calling the cold "life-threatening" for the areas that will be hardest hit, especially the Great Plains and Midwest.