Question

astronomers use different types of electromagnetic waves to observe objects in space. a telescope designed to detect very low - frequency waves would be used to observe which type of object? black holes and distant galaxies emitting radio waves hot gas nebulae emitting ultraviolet light exploding stars emitting gamma rays stars emitting visible light

Explanation:

Radio waves are low - frequency electromagnetic waves. Black holes and distant galaxies emitting radio waves would be observed with a telescope detecting low - frequency waves. Ultraviolet light has a higher frequency than radio waves, gamma rays have even higher frequencies, and visible light has a frequency range higher than radio waves (but lower than ultraviolet and gamma rays in most cases).

Answer:

Black holes and distant galaxies emitting radio waves.