Get a closer look at Ad Astra’s science in this exclusive clip from the Blu-ray version – CNET

Now playing: Watch this: Ad Astra featurette: Reaching for the Stars

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Ad Astradirector James Gray has saidhe wanted the movie aboutan astronautsearching the galaxy for his missing father to be "the most realistic depiction of space travel that's been put in a movie."

Ad Astra, alreadyavailable on digital, is out on Blu-ray, 4K, and DVD on Tuesday, and in anexclusive clip from an Ad Astra featurettecalled "Reach for the Stars," Gray talks about working with NASAto make the science believable.

"The exchange of ideas, and where they think things are going -- you want to get the details right," he said. "I've called them up in 2 in the morning and asked, 'Would this actually happen?'"

NASA technical consultantRobert Yowell, a former NASA engineer, also had a few things to say about the science sharing the screen with Brad Pitt.

"What Gray was looking for in terms of realism was the physics," Yowell said in the video. "For instance, 'Could you fire a gun on the moon?' The answer is yes. A bullet has its own oxidizer that comes right out of the barrel."

Another question Yowell tackled for the movie was what blood looks like in space: "Any fluid in spaces in zero gravity will tend to become a sphere."

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Get a closer look at Ad Astra's science in this exclusive clip from the Blu-ray version - CNET