Even if we knew for certain that a planet was habitable and that humans could exist freely and safely on its surface, we have no real way of getting there.
Noma ngabe besazi ngokuqinisekile ukuthi iplanethi ingahlalwa muntu nokuthi abantu bangaphila ngokukhululeka nangokuphepha endaweni yayo, asinayo indlela yangempela yokufika lapho.