which uncrewed missions did it lead?
Explorer 1
NASA
The first US uncrewed satellite was Explorer 1, which started as an ABMA/JPL project during the early part of the Space Race. It was launched in January 1958, two months after Sputnik. At the creation of NASA, the Explorer project was transferred to the agency and still continues to this day. Its missions have been focusing on the Earth and the Sun, measuring magnetic fields and the solar wind, among other aspects. A more recent Earth satellite, not related to the Explorer program, was the Hubble Space Telescope, which was brought into orbit in 1990.

Cygnus and Cargo Dagon are used to resupply the International Space Station (ISS) as part of NASA's Commercial Resupply Services (CRS) program as of 2020. Cygnus is manufactured by Northrop Grumman and launched on the Antares rocket. Cargo Dragon is manufactured by SpaceX and launched on the Block 5 variant of Falcon 9. SpaceX Dragon, also launched on Falcon 9, was used to resupply the ISS from 2010 to 2020.
who is the second person step on moon Buzz Aldrin where was he born? Glen Ridge, New Jersey, United States when? January 20, 1930 which space agency did he work in? NASA what does it stand for? National Aeronautics and Space Administration when was it established? 1958 which was it's first mission? Project Mercury - On May 5, 1961, astronaut Alan Shepard became the first American in space aboard a capsule he named "Freedom 7" what other missions was it involved in? Gemini 3, Apollo 8, Apollo 11, Asteroid Redirect Mission what was the third one about? Apollo 11 was the spaceflight that first landed humans on the Moon. Neil Armstrong and Buzz Aldrin formed the American crew that landed the Apollo Lunar Module "Eagle" on July 20, 1969
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NASA [SEP] Uncrewed
More than 1,000 uncrewed missions have been designed to explore the Earth and the solar system. Besides exploration, communication satellites have also been launched by NASA. The spacecraft have been launched directly from Earth or from orbiting space shuttles, which could either deploy the satellite itself, or with a rocket stage to take it farther. The first US uncrewed satellite was Explorer 1, which started as an ABMA/JPL project during the early part of the Space Race. It was launched in January 1958, two months after Sputnik. At the creation of NASA, the Explorer project was transferred to the agency and still continues to this day.