もし太陽がなければ

if there were no sun

→ 若し
phrase Rare #36,745
if there were no sun A hypothetical conditional phrase meaning that something would happen if the sun did not exist or were absent. もし marks the hypothetical condition, and なければ means “if there is not.”
JA: もし太陽がなければ、植物は育たないだろう。
EN: If there were no sun, plants would not grow.

もし太陽がなければ地球上生命はないだろう

If there were no sun, there would be no life on Earth.

もし太陽がなければわれわれは生きられないだろう

If there were no sun, we wouldn't be able to live.

もし太陽がなければすべての生物は死んでしまうだろう

If there were no sun, all living things would die.