Astronomy Introduction

 Here is a video overview of astronomy
https://www.youtube.com/watch?v=XkuTINYgTF8

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The 4 Discoveries of Galileo using a telescope:

Galaxies
Sun spots and its rotation
Venus's phases
Jupiter's moons

The 4 Discoveries of Galileo 😱💫🪐🔭☀️ - YouTube

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1. Nicolaus Copernicus - Heliocentric model
2. Tyco Brahe - Parallax measurements to find the distances from the Earth to planets
3. Johannes Kepler- found that planets move in ellipses
4. Galileo Galilei - Jupiter's moons