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The Mobile Service Tower is rolled back to reveal the United Launch Alliance Delta IV Heavy rocket with the Parker Solar Probe onboard, Saturday, Aug. 11, 2018, Launch Complex 37 at Cape Canaveral Air Force Station in Fla. A last-minute technical problem Saturday delayed NASA's unprecedented flight to the sun. Rocket maker United Launch Alliance said it would try again Sunday, provided the helium-pressure issue can be resolved quickly. Once on its way, the Parker probe will venture closer to our star than any other spacecraft.  (Bill Ingalls/NASA via AP)

The Mobile Service Tower is rolled back to reveal the United Launch Alliance Delta IV Heavy rocket with the Parker Solar Probe onboard, Saturday, Aug. 11, 2018, Launch Complex 37 at Cape Canaveral Air Force Station in Fla. A last-minute technical problem Saturday delayed NASA's unprecedented flight to the sun. Rocket maker United Launch Alliance said it would try again Sunday, provided the helium-pressure issue can be resolved quickly. Once on its way, the Parker probe will venture closer to our star than any other spacecraft. (Bill Ingalls/NASA via AP)

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