ASTR 1P01 Lecture 1: Introduction
Barak Shoshany・2 minutes read
Astronomy introduces basic concepts about celestial objects and the universe using the scientific method and observation, including the transition from a geocentric to heliocentric model. The vastness of cosmic distances, the composition of galaxies and atoms, and the scale of the universe are key topics, highlighting humans' position in the cosmos and the evolution of astronomical knowledge.
Insights
- Astronomy is a science that uses the scientific method, involving observations, experiments, and hypotheses that are rigorously tested and verified to become established theories.
- Ancient astronomers initially believed in a geocentric model with Earth at the center, but more precise measurements and observations led to the acceptance of the heliocentric model with the sun at the center of the solar system.
- Understanding cosmic distances allows astronomers to observe the universe's history by looking at objects millions or billions of light-years away, providing insights into the evolution of the universe over time.
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Recent questions
What is astronomy?
The study of celestial objects and the universe.
How do astronomers measure distances?
Using light-years to showcase vast astronomical distances.
What is the Milky Way galaxy?
The galaxy where Earth is located.
What is the Big Bang theory?
The origin of the universe 13.8 billion years ago.
What are atoms made of?
Nucleus with protons and neutrons, surrounded by electrons.
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