I do swear by the positions of the stars.
Translation endnotes
[56:75-76] Our universe consists of billions of galaxies, each containing billions of stars. Each of these heavenly bodies that we are even unable to count, move in orbits determined by the same explosion and by the same universal laws of gravity. The more our knowledge of astronomy and cosmology increases, the more we appreciate the meaning of this oath. Can the expression "the place of stars" refer to black holes? For the function of oaths in the Quran see 89:5.