description Vanguard 1 Overview
Vanguard 1 is an American satellite launched on March 17, 1958, as part of the U.S. Navy's Vanguard project. It was the fourth satellite ever placed in Earth orbit, following Sputnik 1, Sputnik 2, and Explorer 1, and is the oldest human-made object still in orbit. Vanguard 1 was the first satellite to be powered by solar energy, using six small photovoltaic cells mounted on its body.
It transmitted signals until 1964 and continues to orbit Earth, though it is now non-functional and tracked as space debris.
insights Ranking position
Vanguard 1 ranks #31 of 100 in the Spacecraft ranking, behind Gemini 12, ahead of Chinese Space Station (Tiangong).
help Vanguard 1 FAQ
When was Vanguard 1 launched into space?
Vanguard 1 was launched by the United States on March 17, 1958. It was the second successful American satellite to reach orbit, following closely behind Explorer 1.
Is Vanguard 1 still in orbit around Earth?
Yes, Vanguard 1 is the oldest human-made object still orbiting the Earth today. Although communication with the satellite was lost in 1964, it remains in a stable, long-term orbit and is expected to stay there for centuries.
What made Vanguard 1 unique compared to early Soviet satellites?
Vanguard 1 was the first satellite in history to be powered by solar cells. Unlike the battery-powered Soviet Sputnik 1 and Sputnik 2, Vanguard 1's solar panels allowed it to transmit data back to Earth for years.
How big was the Vanguard 1 satellite?
Vanguard 1 was incredibly small, consisting of a tiny aluminum sphere just 16.5 centimeters (6.5 inches) in diameter. Because of its diminutive size, Soviet Premier Nikita Khrushchev famously referred to it as the grapefruit satellite.
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