Astronomy

Definition

Astronomy is the scientific study of celestial objects, space, and the universe as a whole. It involves observing and analyzing stars, planets, galaxies, and cosmic phenomena to understand their origins, evolution, and properties.

5 Must Know Facts For Your Next Test

1. Astronomy is one of the oldest sciences, with roots tracing back to ancient civilizations that used celestial observations for calendars and navigation.
2. Modern astronomy relies heavily on electromagnetic spectrum analysis to gather data from different types of light emitted by celestial bodies.
3. The Hubble Space Telescope has significantly advanced our understanding of the universe by providing high-resolution images of distant galaxies and nebulae.
4. Galileo Galilei's use of the telescope in the early 17th century marked a major turning point in astronomical observation and theory.
5. There are two main branches of astronomy: observational astronomy (collecting data) and theoretical astronomy (modeling and understanding celestial phenomena).

Review Questions

• What role does the electromagnetic spectrum play in modern astronomy?
• How did Galileo Galilei contribute to the field of astronomy?
• What are the two main branches of astronomy, and what do they focus on?

Related terms

Cosmology:

The study of the origin, evolution, and eventual fate of the universe.

Astrophysics:

The branch of astronomy that deals with the physics of celestial objects and phenomena.

Celestial Mechanics:

The branch of astronomy that studies the motions and gravitational interactions between celestial bodies.