Nononono Avatar I didn't say anything about colonising other planets thats hundreds of years away I was talking MINING
Asteroid mining is a theoretical possibility in the not too distant future as is mining the moon.
The initial investment is gonna be huge and since we arent out of cheaper options right here its not being done but once things tget too expensive here...there is another source.
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Disintigration is easy, If you really want to impress me, ReIntegrate it.