وَالسَّمَاءِ ذَاتِ الرَّجْعِ
By the sky (samaa') which returns (raj' - to return something). So the sky returns something.

What does it return?


We learn in tafsir that the sky returns rain over and over again. When the rain comes, it penetrates the earth - it forms rivers and oceans. And these oceans soon dry out (evaporation) - causing the sky to return [raj'] the rain which was evaporated earlier.

Another implication; Shaykh Zanadani is a contemporary scholar in science, who says that radiation is sent down from the Ozone layer, and satellite signals are too - the signal is sent from the sky (samaa' - space above us) to recievers on the planet, and these signals send back a response to the satellite in space. Allah knows best.


Classically this is referring to the water cycle.