Does the Quran actually refer to the expansion of the universe?

According to many Islamic sources, Quran 51:47 refers to the expansion of the universe, a phenomenon that has been made known to us in the recent century. > And the heaven We constructed with strength, and indeed, We are [its] expander. (51:47) Most of the debate pertaining to this verse is centered on the word 'musioona', and whether it implies an expansion of space in the past, or a continuous & ongoing expansion. **However, how do we know in the first place that the word 'samaa' used in this verse is referring to the greater universe (i.e heaven)?** In the Quran, Allah frequently reminds us of rain coming from the sky, as provision for his creation: > Do you not see that Allah sends down rain from the sky and makes it flow as springs [and rivers] in the earth; .... (39:21) In verses such as these, the term 'samaa' cannot be used to denote the wider universe, but rather the closer regions of Earth's atmosphere to us. Just to clarify, I understand that Arabic words can mean multiple things - 'samaa' can be either "sky" or "heaven"- **but is it possible to know for certain which of these meanings is meant in 51:47 (i.e without using a potential scientific interpretation)?**