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First orbit: Explorer 1 satellite
ceased transmission of data due to dead batteries, but remained in orbit for 12 years.
6 launches over time
3 successful
3 unsuccessful
Reentry over the Pacific ocean on March 30, 1970 -
Failed because the fourth stage did not ignite
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Down June 28, 1958
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Down October 23,1959
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It failed after booster collided with second stage after separation, causing upper stage firing angle to be off.
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Failed when second stage separated preternaturally from booster