Even in the very optimistic case of a livable planet that is not too far, say a few dozen light years, which is not a lot, it's in the neighborhood, the time to go there is considerable," he added.
Ngisho esimweni esinethemba kakhulu seplanethi evelekayo engekho kude kakhulu, yisho iminyaka embalwa yokukhanya, okungekho okuningi, kungomakhelwane, isikhathi okufanele sihambe ngaso kucatshangelwe, "kusho imeya I-AFP. .