Explorer program: Timeline

1958   Explorer program: Explorer IV is launched

1959   Explorer program: The United States United States

The United States of America, also known as the United States, the U.S., the U.S.A., a... 

 launches Explorer 6 from the Atlantic Missile Range in Cape Canaveral Cape Canaveral

Cape Canaveral is a strip of land in Brevard County, Florida [i], United States [i], near the center of ... 

, Florida Florida

Florida is a U.S. state [i] located in the southeastern [i] United States [i] ... 

.

1966   Explorer program: Explorer 32 is launched.

1970   NASA's NASA

The National Aeronautics and Space Administration is an agency of the United States Government [i], res ... 

 Explorer I Explorer I

Explorer-I, officially Satellite 1958 Alpha , was the first Earth satellite [i] of the United States [i] ... 

, the first American artificial satellite Satellite

A satellite is any object that orbit [i]s another object . ... 

 and the first of the Explorer program spacecrafts, reenters Earth's atmosphere after 12 years in orbit.