"Our planet's tilt axis seems to be 'just right,'" says the book Rare Earth - Why Complex Life Is Uncommon in the Universe.
Buku leyi nge Rare Earth - Why Complex Life Is Uncommon in the Universe yi ri: "Ndlela leyi pulanete ya hina yi voyameke ha yona yi endla leswaku swivumbiwa swi kota ku hanya eka yona."3