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Astronomy, a natural science, is the study of celestial objects (such as stars, galaxies, planets, moons, asteroids, comets and nebulae) and processes (such as supernovae explosions, gamma ray bursts, and cosmic microwave background radiation), the physics, chemistry, and evolution of such objects and processes, and more generally all phenomena that originate outside the atmosphere of Earth. A related but distinct subject, physical cosmology, is concerned with studying the Universe as a whole.[1]

Astronomy is one of the oldest sciences. The early civilizations in recorded history, such as the Babylonians, Greeks, Indians, Egyptians, Nubians, Iranians, Chinese, and Maya performed methodical observations of the night sky. However, the invention of the telescope was required before astronomy was able to develop into a modern science. Historically, astronomy has included disciplines as diverse as astrometry, celestial navigation, observational astronomy and the making of calendars, but professional astronomy is nowadays often considered to be synonymous with astrophysics.[2]

During the 20th century, the field of professional astronomy split into observational and theoretical branches. Observational astronomy is focused on acquiring data from observations of astronomical objects, which is then analyzed using basic principles of physics. Theoretical astronomy is oriented toward the development of computer or analytical models to describe astronomical objects and phenomena. The two fields complement each other, with theoretical astronomy seeking to explain the observational results and observations being used to confirm theoretical results.

Astronomy is one of the few sciences where amateurs can still play an active role, especially in the discovery and observation of transient phenomena. Amateur astronomers have made and contributed to many important astronomical discoveries.

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Course Curriculum

Level 1
Introduction to Astronomy: Crash Course Astronomy #1 Details FREE 00:00:00
Naked Eye Observations: Crash Course Astronomy #2 Details FREE 00:00:00
Cycles in the Sky: Crash Course Astronomy #3 Details FREE 00:00:00
Moon Phases: Crash Course Astronomy #4 Details FREE 00:00:00
Eclipses: Crash Course Astronomy #5 Details FREE 00:00:00
Telescopes: Crash Course Astronomy #6 Details FREE 00:00:00
Level 2
The Gravity of the Situation: Crash Course Astronomy #7 Details FREE 00:00:00
Tides: Crash Course Astronomy #8 Details FREE 00:00:00
Introduction to the Solar System: Crash Course Astronomy #9 Details FREE 00:00:00
The Sun: Crash Course Astronomy #10 Details FREE 00:00:00
The Earth: Crash Course Astronomy #11 Details FREE 00:00:00
Level 3
The Moon: Crash Course Astronomy #12 Details FREE 00:00:00
Mercury: Crash Course Astronomy #13 Details FREE 00:00:00
Venus: Crash Course Astronomy #14 Details FREE 00:00:00
Mars: Crash Course Astronomy #15 Details FREE 00:00:00
Jupiter: Crash Course Astronomy #16 Details FREE 00:00:00
Level 4
Jupiter’s Moons: Crash Course Astronomy #17 Details FREE 00:00:00
Saturn: Crash Course Astronomy #18 Details FREE 00:00:00
Uranus & Neptune: Crash Course Astronomy #19 Details FREE 00:00:00
Asteroids: Crash Course Astronomy #20 Details FREE 00:00:00
Comets: Crash Course Astronomy #21 Details FREE 00:00:00
Level 5
The Oort Cloud: Crash Course Astronomy #22 Details FREE 00:00:00
Meteors: Crash Course Astronomy #23 Details FREE 00:00:00
Light: Crash Course Astronomy #24 Details FREE 00:00:00
Distances: Crash Course Astronomy #25 Details FREE 00:00:00
Stars: Crash Course Astronomy #26 Details FREE 00:00:00
Level 6
Exoplanets: Crash Course Astronomy #27 Details FREE 00:00:00
Brown Dwarfs: Crash Course Astronomy #28 Details FREE 00:00:00
Low Mass Stars: Crash Course Astronomy #29 Details FREE 00:00:00
White Dwarfs & Planetary Nebulae: Crash Course Astronomy #30 Details FREE 00:00:00
High Mass Stars: Crash Course Astronomy #31 Details FREE 00:00:00
Level 7
Neutron Stars: Crash Course Astronomy #32 Details FREE 00:00:00
Black Holes: Crash Course Astronomy #33 Details FREE 00:00:00
Binary and Multiple Stars: Crash Course Astronomy #34 Details FREE 00:00:00
Star Clusters: Crash Course Astronomy #35 Details FREE 00:00:00
Nebulae: Crash Course Astronomy #36 Details FREE 00:00:00
Level 8
The Milky Way: Crash Course Astronomy #37 Details FREE 00:00:00
Galaxies, part 1: Crash Course Astronomy #38 Details FREE 00:00:00
Galaxies, part 2: Crash Course Astronomy #39 Details FREE 00:00:00
Gamma-Ray Bursts: Crash Course Astronomy #40 Details FREE 00:00:00
Dark Matter: Crash Course Astronomy #41 Details FREE 00:00:00
Level 9
The Big Bang, Cosmology part 1: Crash Course Astronomy #42 Details FREE 00:00:00
Dark Energy, Cosmology part 2: Crash Course Astronomy #43 Details FREE 00:00:00
A Brief History of the Universe: Crash Course Astronomy #44 Details FREE 00:00:00
Deep Time: Crash Course Astronomy #45 Details FREE 00:00:00
Everything, The Universe…And Life: Crash Course Astronomy #46 Details FREE 00:00:00

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