Question

why do astronomers find it difficult to locate extrasolar planets with telescopes?
a. extrasolar planets are not bright compared to the stars they orbit.
b. there is no life on extrasolar planets.
c. extrasolar planets are much colder than earth.

Explanation:

Extrasolar planets are dim compared to their host - stars, making them hard to detect directly with telescopes. The presence or absence of life and temperature relative to Earth are not the main reasons for detection difficulty with telescopes.

Answer:

A. Extrasolar planets are not bright compared to the stars they orbit.