He calls the idea of trading in Earth for a new home "completely crazy."
It's been a busy week for astrophysicist Michel Mayor.
"If we are talking about exoplanets," Mayor told Agence France-Presse when asked about off-world colonization, "things should be clear: we will not migrate there."
Really Long Road Trip
The problem, according to Mayor, is sheer distance.
"Even in the very optimistic case of a livable planet that is not too far, say a few dozen light years... the time to go there is considerable," he told AFP. "We are talking about hundreds of millions of days using the means we have available today."
Only One Earth
With climate change putting our future on Earth in jeopardy, Mayor told AFP he wanted to "kill all the statements that say 'OK, we will go to a livable planet if one day life is not possible on Earth'," an idea he later called "completely crazy."
"We must take care of our planet," Mayor insisted. "It is very beautiful and still absolutely livable."
READ MORE: Humans will not 'migrate' to other planets, Nobel winner says [Agence France-Presse]
More on exoplanets: NASA Just Released an Incredible Map of All Known Exoplanets
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