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Small satellite launched into an eccentric orbit with a cosmic ray counter and a micrometeorite detector.
Small satellite used to test the Vanguard three-stage launch vehicle.
Small satellite similar to Explorer 1. It failed to reach orbit due to a fourth stage failure.
First successfully launched American satellite. It was the first spacecraft to detect the Van Allen Radiation Belt.
Second artificial satellite and first to carry an animal into orbit.
First artificial satellite consisting of a 58 cm pressurized aluminium shell containing two 1 W transmitters for a total mass of 83.6 kg.