(Az-Zukhuruf) 43 : 84
وَهُوَ الَّذِي فِي السَّمَاءِ إِلَٰهٌ وَفِي الْأَرْضِ إِلَٰهٌ ۚ وَهُوَ الْحَكِيمُ الْعَلِيمُ
And He is the only "Ilah"-Deity- in heaven and the only Deity on the earth; and He is the Wise, the Knower.
To understand about the Deity, read the explanation of the verse 2: 255. Allah is the single Deity not only on the earth, but also on any planet in the universe. See explanation 23: 116-117; 28: 88; 41: 5-7 and 42: 29.