A geomagnetic storm could make aurora borealis—or the northern lights—visible across parts of the United States overnight ...

A NASA map shows the size of the Antarctic ozone hole at its largest point this year, when it spread to the size of North America. The ozone layer protects life on Earth from the sun's ultraviolet ...

Our conventions as map readers and makers have converged over time to a north-up default. What happens when that convention ...

Native languages and language families of North America [map] / compiled by Ives Goddard Smithsonian Libraries and Archives Object Details Author Goddard, Ives 1941- Smithsonian Institution Notes ...