The crew of Apollo 8 would be the first to travel beyond low Earth orbit and enter the gravitational pull of another celestial body.
"So, a single Falcon 9 rocket has about 30kg, so this is quite a lot more," he says.
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Collins, the father of Emily in Paris star Lily, also said he would "love" to tour again but wasn't sure he wanted to "go as far as to launch that boat".
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