This statement is true. Astronomers study stars, planets, and other celestial objects like galaxies, nebulae, and black holes.

Here's why:

* Stars: Astronomers investigate the life cycle of stars, their composition, temperature, and how they influence their surrounding environment.

* Planets: They study the formation, composition, and atmospheres of planets within and outside our solar system.

* Other Heavenly Bodies: Astronomers explore the vast universe, investigating galaxies, black holes, supernovas, and other fascinating cosmic phenomena.

So, astronomers are the experts on all things celestial!