answersLogoWhite

0

Explorer 1 was launched by the US on 31 January 1958, cylindrical in shape as opposed to the 'Sputnik' which had been round. It remained in orbit until March 1970. Its major achievement was the discovery of the Van Allen radiation belts around the Earth.
The first was Vangaurd.
The first successful U.S. satellite was Explorer I. It was launched into Earth orbit by the Army on January 31, 1958, at Cape Canaveral, Florida, four months after Russia orbited Sputnik. It weighed 18 pounds and had a cylindrical shape. It was 80 inches long and six inches in diameter.

User Avatar

Wiki User

11y ago

What else can I help you with?