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Frimus
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Recently I found a real gem for astronomy enthusiasts and junior undergraduate students. It has a plenty of pictures, diagrams, links to other resources and visualizations.
You can access this excellent up-to-date Astronomy textbook (cca 1200 pages) for free in web view or PDF.
I have included Contents as an appetiser for a curious reader:
Chapter 1: Science and the Universe: A Brief Tour
Chapter 2: Observing the Sky: The Birth of Astronomy
Chapter 3: Orbits and Gravity
Chapter 4: Earth, Moon, and Sky
Chapter 5: Radiation and Spectra
Chapter 6: Astronomical Instruments
Chapter 7: Other Worlds: An Introduction to the Solar System
Chapter 8: Earth as a Planet
Chapter 9: Cratered Worlds
Chapter 10: Earthlike Planets: Venus and Mars
Chapter 11: The Giant Planets
Chapter 12: Rings, Moons, and Pluto
Chapter 13: Comets and Asteroids: Debris of the Solar System
Chapter 14: Cosmic Samples and the Origin of the Solar System
Chapter 15: The Sun: A Garden-Variety Star
Chapter 16: The Sun: A Nuclear Powerhouse
Chapter 17: Analyzing Starlight
Chapter 18: The Stars: A Celestial Census
Chapter 19: Celestial Distances
Chapter 20: Between the Stars: Gas and Dust in Space
Chapter 21: The Birth of Stars and the Discovery of Planets outside the Solar System
Chapter 22: Stars from Adolescence to Old Age
Chapter 23: The Death of Stars
Chapter 24: Black Holes and Curved Spacetime
Chapter 25: The Milky Way Galaxy
Chapter 26: Galaxies
Chapter 27: Active Galaxies, Quasars, and Supermassive Black Holes
Chapter 28: The Evolution and Distribution of Galaxies
Chapter 29: The Big Bang
Chapter 30: Life in the Universe
Appendix A: How to Study for Your Introductory Astronomy Course
Appendix B: Astronomy Websites, Pictures, and Apps
Appendix C: Scientific Notation
Appendix D: Units Used in Science
Appendix E: Some Useful Constants for Astronomy
Appendix F: Physical and Orbital Data for the Planets
Appendix G: Selected Moons of the Planets
Appendix H: Upcoming Total Eclipses
Appendix I: The Nearest Stars, Brown Dwarfs, and White Dwarfs
Appendix J: The Brightest Twenty Stars
Appendix K: The Chemical Elements
Appendix L: The Constellations
Appendix M: Star Charts and Sky Event Resources
You can access this excellent up-to-date Astronomy textbook (cca 1200 pages) for free in web view or PDF.
I have included Contents as an appetiser for a curious reader:
Chapter 1: Science and the Universe: A Brief Tour
Chapter 2: Observing the Sky: The Birth of Astronomy
Chapter 3: Orbits and Gravity
Chapter 4: Earth, Moon, and Sky
Chapter 5: Radiation and Spectra
Chapter 6: Astronomical Instruments
Chapter 7: Other Worlds: An Introduction to the Solar System
Chapter 8: Earth as a Planet
Chapter 9: Cratered Worlds
Chapter 10: Earthlike Planets: Venus and Mars
Chapter 11: The Giant Planets
Chapter 12: Rings, Moons, and Pluto
Chapter 13: Comets and Asteroids: Debris of the Solar System
Chapter 14: Cosmic Samples and the Origin of the Solar System
Chapter 15: The Sun: A Garden-Variety Star
Chapter 16: The Sun: A Nuclear Powerhouse
Chapter 17: Analyzing Starlight
Chapter 18: The Stars: A Celestial Census
Chapter 19: Celestial Distances
Chapter 20: Between the Stars: Gas and Dust in Space
Chapter 21: The Birth of Stars and the Discovery of Planets outside the Solar System
Chapter 22: Stars from Adolescence to Old Age
Chapter 23: The Death of Stars
Chapter 24: Black Holes and Curved Spacetime
Chapter 25: The Milky Way Galaxy
Chapter 26: Galaxies
Chapter 27: Active Galaxies, Quasars, and Supermassive Black Holes
Chapter 28: The Evolution and Distribution of Galaxies
Chapter 29: The Big Bang
Chapter 30: Life in the Universe
Appendix A: How to Study for Your Introductory Astronomy Course
Appendix B: Astronomy Websites, Pictures, and Apps
Appendix C: Scientific Notation
Appendix D: Units Used in Science
Appendix E: Some Useful Constants for Astronomy
Appendix F: Physical and Orbital Data for the Planets
Appendix G: Selected Moons of the Planets
Appendix H: Upcoming Total Eclipses
Appendix I: The Nearest Stars, Brown Dwarfs, and White Dwarfs
Appendix J: The Brightest Twenty Stars
Appendix K: The Chemical Elements
Appendix L: The Constellations
Appendix M: Star Charts and Sky Event Resources