(a) Some stars are too far away for our telescopes to see.
Astronomers:
A scientist who concentrates their research on a particular issue or area outside the purview of Earth is called an astronomer in the science of astronomy.
They perform observational (by evaluating the data) or theoretical astronomy when observing astronomical objects including stars, planets, moons, comets, and galaxies.
Planetary science, solar astronomy, the creation or evolution of stars, or the formation of galaxies are a few examples of subjects or domains that astronomers investigate.
Physical cosmology, which investigates the entire Universe, is a similar but separate topic.
Therefore, the correct option is (a) Some stars are too far away for our telescopes to see.
