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