The correct answer is: C. Both A & B
The light of distant stars is affected by both interstellar dust and the Earth’s atmosphere.
Interstellar dust is a cloud of tiny particles that exists between the stars. These particles can scatter and absorb light, making it difficult to see distant stars. The Earth’s atmosphere is also made up of tiny particles, which can scatter and absorb light. This is why stars appear to twinkle in the night sky.
The amount of dust and other particles in the atmosphere can vary depending on the time of day, the weather conditions, and the location of the observer. This can make it difficult to observe distant stars, especially when they are low in the sky.
Astronomers use a variety of techniques to overcome the effects of interstellar dust and the Earth’s atmosphere. One technique is to use telescopes that are located in space, above the atmosphere. Another technique is to use special filters that can block out the light from the atmosphere.
Despite the challenges, astronomers have been able to learn a great deal about distant stars. They have learned about their composition, their temperature, and their distance from Earth. They have also learned about the evolution of stars and the formation of galaxies.