1955December 1 in Alabama

Rosa Parks

boarded the Montgomery Bus and refused to give up her seat to a white person.

Rosa Parks

This pivotal moment leads to a new era for equality and freedom.

soared into space, lofting the United States into the Space Age.

Explorer 1

1958

Explorer 1

Explorer 1 made its nal transmis-sion on May 23, 1958 and burned up on March 31, 1970, after more than 58,000 orbits.

Explorer 1