The First Spacewalk (1965): This iconic photo of Ed White floating freely during ... completely transforming how we see the size and depth of the universe. Pale Blue Dot (1990): Taken by Voyager 1 ...

Earth Day is held on April 22 with this year’s being the 55th anniversary of the first in 1970. It began during a time of great public protest in this country due to the Vietnam War, the Nixon ...