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307 records
Snapshot 2026-09-06
Active filters: Department of Defense
Open the explorerNot carried: Department of Defense.
Launched 1959
Completed · Partial SuccessThe first United States spacecraft to escape Earth's gravity, passing the Moon and entering heliocentric orbit.
Launched 1958
Failed · FailureA United States lunar flyby attempt that fell short of escape velocity but returned data revealing a second radiation belt around Earth.
Launched 1958
Failed · FailureNASA's first launched spacecraft, intended for lunar orbit, which fell short of escape velocity and re-entered after reaching high altitude.
Launched 1958
Failed · FailureThe first United States attempt to send a spacecraft to the Moon, lost when its Thor-Able launch vehicle failed shortly after liftoff.