The phrase "distant suns" refers to the stars that are very far away from us. It suggests the idea of a vast and expansive universe where there are countless other stars shining in the distance. Full definition
«Is there some sort of fluorescence or luminescence involved or is [light] reflected from distant suns?» (sciencenews.org)
Likewise, when astronomers announced that they had found six new planets orbiting distant suns earlier this month, the real value of the discoveries lay in the possibility of understanding the mechanics of planet formation in ways that would have been impossible a mere five years ago. (newscientist.com)
Equipped with a 12 - meter mirror, it would also be about 100 times more powerful, giving it the capability to observe the atmospheres of planets orbiting around distant suns. (newsweek.com)