Updated: December 5, 2014 7:44 AM ET | Originally published: December 4, 2014 6:30 AM EST

A series of problems forced NASA to delay a planned launch of its its new Orion spacecraft on Thursday.

The next launch attempt is slated for Friday at 7:05 a.m. ET.

The launch, an early step in NASA’s mission to send people to Mars, was set to begin at 7:05 a.m. ET on Thursday but was delayed multiple times for a variety of reasons, including a boat in the area and valve trouble on the core booster. Thursday’s launch window closed at 9:44 a.m. ET.

The un-crewed Orion is intended to orbit 3,600 miles above Earth before it finally crashes into the Pacific Ocean. It will measure the effects of high radiation zones on the spacecraft, which has a heat shield to withstand massive temperatures when it speeds into the atmosphere at 20,000 mph, before finally hitting the ocean.

There will be more test-runs to come for Orion, a vessel that NASA hopes will ultimately take astronauts into new places–maybe even Mars.

Contact us at editors@time.com.

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