Final answer:
A telescope detects fainter objects by collecting more light. The size of the aperture determines the telescope's light-gathering power.
Step-by-step explanation:
Fainter Objects and Telescopes
A telescope detects fainter objects by collecting more light. The more light a telescope can collect, the fainter the objects it can observe. Astronomers strive to build telescopes that can collect more and more of the faint light in the universe. This allows them to observe objects that are farther away and learn about periods of time deeper in the past. The size of the aperture of a telescope, the opening through which light travels or reflects, determines its light-gathering power. The larger the aperture, the more light the telescope can collect and the fainter the objects it can detect.