Answer:



The correct answer is option 'B' - Astronomer.



Astronomers are scientists who study celestial objects such as stars, planets, moons, comets, and galaxies. They use various tools and techniques to observe and analyze these objects, aiming to understand their composition, formation, behavior, and interactions.



Astronomers focus their studies on several celestial objects:

1. Stars:
Astronomers study stars to understand their life cycle, composition, temperature, size, brightness, and other properties. They observe different types of stars, including dwarf stars, giant stars, supernovae, and even black holes.

2. Planets:
Astronomers investigate planets within our solar system and beyond. They explore their atmospheres, surfaces, moons, and potential for supporting life. They also search for exoplanets (planets outside our solar system) and study their characteristics.

3. Moons:
Moons are natural satellites that orbit planets. Astronomers study their formation, surface features, and interactions with their parent planets. They also investigate the potential for moons to support life and their role in the larger celestial system.

4. Comets:
Comets are icy bodies that orbit the sun. Astronomers study comets to learn more about the early solar system, as they are believed to contain preserved material from that time. By analyzing their composition and behavior, astronomers gain insights into the origins of our solar system.

5. Galaxies:
Galaxies are vast systems of stars, gas, and dust held together by gravity. Astronomers study galaxies to understand their structure, formation, evolution, and the processes occurring within them. They explore different types of galaxies, such as spiral galaxies, elliptical galaxies, and irregular galaxies.



In conclusion, astronomers are scientists who specialize in studying stars, planets, moons, comets, and galaxies. By observing and analyzing these celestial objects, astronomers contribute to our understanding of the universe and its vast wonders.