Apparent contradiction in verse 2:29

Verse 2:29, > هُوَ ٱلَّذِى خَلَقَ لَكُم مَّا فِى ٱلْأَرْضِ جَمِيعًا ثُمَّ ٱسْتَوَىٰٓ > إِلَى ٱلسَّمَآءِ فَسَوَّىٰهُنَّ سَبْعَ سَمٰوٰتٍۚ وَهُوَ بِكُلِّ > شَىْءٍ عَلِيمٌ > > It is He who created for you all of that which is on the earth. Then > He directed Himself to the heaven, and > made them seven heavens, and He is Knowing of all things. 1st question:- Here Allah says that he first created the earth and everything in it. **Then he directed himself towards the heaven.** The problem I've here is that, To direct oneself towards something, that thing has to **exist**. What I mean is that Allah said that he only created the earth, the heaven was yet not created, So how could He direct Himself towards something which didn't yet exist? 2nd question:- Allah said that He first created the earth **then** he created the heaven. But we know from Big Bang theory that the heaven and the earth formed simultaneously. So isn't this unscientific? If there's any problem in my question please inform me. Thanks!