Surah ar-Rahman (The Most Merciful ) 55 : 7

Explanatory Note
 

"He has raised the skies high, and has set the balance, so that you may not exceed the balance. Weigh, therefore, with justice and do not fall short in the balance." (Verses 7-9) The reference to the skies is intended, like all other references in the Qur'an to the two immediate aspects of the universe, to awaken minds and hearts that have become oblivious to the wonders around them, because of long familiarity. These minds and hearts should look at the universe, appreciate its wonderful beauty, harmony and coordination, and glorify the One who initiated all.
 
Whatever is meant by the skies, the reference to them lifts our sight to the great space above us, which appears without boundaries, and in which float trillions of huge celestial bodies, yet no collision occurs between them, either individually or in clusters. A cluster may include as many as a billion stars, as in the galaxy which includes our own solar system. Our sun has a diameter of 2.3 million kilometers, yet within our galaxy there are many smaller stars and many that are larger by thousands of times. All these stars and clusters of stars and planets move in space at frightening speeds, but in the great space above they are no more than particles floating far apart from each other.