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Surah 16. An-Nahl
Ayah 48 - 50
48 أَوَلَمْ يَرَوْا۟ إِلَىٰ مَا خَلَقَ ٱللَّهُ مِن شَىْءٍ يَتَفَيَّؤُا۟ ظِلَـٰلُهُۥ عَنِ ٱلْيَمِينِ وَٱلشَّمَآئِلِ سُجَّدًا لِّلَّهِ وَهُمْ دَٰخِرُونَ
49 وَلِلَّهِ يَسْجُدُ مَا فِى ٱلسَّمَـٰوَٰتِ وَمَا فِى ٱلْأَرْضِ مِن دَآبَّةٍ وَٱلْمَلَـٰٓئِكَةُ وَهُمْ لَا يَسْتَكْبِرُونَ
50 يَخَافُونَ رَبَّهُم مِّن فَوْقِهِمْ وَيَفْعَلُونَ مَا يُؤْمَرُونَ ۩
[48-50] And don't they observe anything created by Allah how it casts its shadow right and left, prostrating itself before Allah?41 Thus all things express their humility. All the animate creation in the heavens and the earth and all the angels prostrate themselves in adoration before Allah;42 they do not show any arrogance at all; they fear their Lord Who is above them, and do whatever they are bidden.
41The argument is this: The fact that everything-a man, an animal, a tree or a mountain-casts its shadow, is a clear proof of its material nature, and everything which is made of matter, is a creation of Allah and is subject to a universal law. In this case the law is that every material thing casts its shadow, which is symbolical of its servitude, and it cannot have any share whatsoever in Godhead.
42That is, "Not only all things on the earth alone but also all things in the heavens, including all those whom people have been regarding as gods and goddesses. and considering to be closely related to Allah arc subservient to God, and have no share whatsoever in His Godhead."
Incidentally, it implies the existence of living creatures not only on the earth but in the planets, too.