English ⇄ Russian +

sweep the sky with a telescope stresses
gen.	обшаривать небо телескопом (Anyone who takes the time to sweep the sky with a telescope around the famed M objects cannot help but chance upon some nebulae and clusters that were not included in his catalogue, apparently escaping his gaze.)
Makarov.	осматривать небо в телескоп; обшаривать небо телескопом
sweep the sky the horizon, the sea, etc. with a telescope
gen.	осмотреть небо и т.д. в телескоп