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Science
Astronomy

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Astronomy Courses and Certifications

Learn Astronomy, earn certificates with free online courses from Harvard, Stanford, MIT, University of Pennsylvania and other top universities around the world. Read reviews to decide if a class is right for you.

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9 Best Free Astronomy Courses for 2025

Discover the secrets of the universe with the best astronomy courses from renowned instructors and universities.

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University of Arizona

Astronomy: Exploring Time and Space

24 reviews
CrashCourse

Astronomy by CrashCourse

11 reviews
Astronomy and Space for Children

2 reviews
The Science of the Solar System

51 reviews
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Moons

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Astronomy: images of the Universe

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Astrobiology and the Search for Extraterrestrial Life

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Archaeoastronomy

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From the Big Bang to Dark Energy

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The Science of the Solar System
53 reviews

Explore the solar system using principles from multiple sciences. Understand Mars, outer planets, exoplanets, and habitability. Advanced content with critical thinking emphasis.
- Coursera
- 30 hours
- On-Demand
- Free Online Course (Audit)
- Best of All Time
Astrobiology and the Search for Extraterrestrial Life
34 reviews

Learn about the origin and evolution of life and the search for life beyond the Earth.
- Coursera
- 11 hours
- On-Demand
- Free Online Course (Audit)
- Best of All Time
University of Arizona
Astronomy: Exploring Time and Space
24 reviews

This course is designed for anyone who is interested in learning more about modern astronomy. We will help you get up to date on the most recent astronomical discoveries while also providing support at an introductory level for those who have no backgrou…
- Coursera
- 1 day 19 hours 13 minutes
- On-Demand
- Free Online Course (Audit)
- Best of All Time
From the Big Bang to Dark Energy
18 reviews

Explore the Universe's evolution from the Big Bang to dark energy, covering cosmic mysteries like dark matter, the Higgs boson, and accelerating expansion. Gain insights into cutting-edge astrophysics research.
- Coursera
- 31 hours
- On-Demand
- Free Online Course (Audit)
Australian National University
Greatest Unsolved Mysteries of the Universe
15 reviews

Exploring the biggest mysteries of modern astrophysics.
- edX
- 9 weeks, 2-4 hours a week
- On-Demand
- Free Online Course (Audit)
AstroTech: The Science and Technology behind Astronomical Discovery
11 reviews

Explore the interplay of technology and physics in modern astronomical discoveries, from black holes to dark energy, and learn how cutting-edge tools unlock cosmic secrets.
- Coursera
- 6-7 hours
- On-Demand
- Free Online Course (Audit)
CrashCourse
Astronomy by CrashCourse
11 reviews

This course starts with the astronomical observations we can make with the naked eye and expands out to cover the solar system, stars, galaxies, and the universe itself. The content is loosely based on an introductory university-level curriculum.
- YouTube
- 9 hours
- On-Demand
- Free Video
Archaeoastronomy
8 reviews

Explore ancient monuments' connections to astronomy, religion, and power. Learn how civilizations incorporated celestial knowledge into architecture and sacred spaces worldwide.
- Coursera
- 7 hours 10 minutes
- On-Demand
- Free Online Course (Audit)
Archaeoastronomy
8 reviews

Explore ancient cultures' understanding of celestial phenomena and their integration into architecture, power structures, and daily life across different civilizations.
- Polimi OPEN KNOWLEDGE
- 8 weeks, 2-3 hours a week
- On-Demand
- Free Online Course
Origins - Formation of the Universe, Solar System, Earth and Life
7 reviews

The Origins course tracks the origin of all things – from the Big Bang to the origin of the Solar System and the Earth. The course follows the evolution of life on our planet through deep geological time to present life forms.
- Coursera
- 23 hours
- On-Demand
- Free Online Course (Audit)
Super-Earths and Life
5 reviews

Learn about the Earth, life, and how we can search for life elsewhere in the universe.
- edX
- 15 weeks, 3-5 hours a week
- On-Demand
- Free Online Course (Audit)
From Chemistry to Life
3 reviews

To look for evidence of life on other planets, we have to adapt what we know about chemistry on Earth to aid our search. Astronomer Dimitar Sasselov explains how we can use what we already know to search for alien life in this Master Class.
- World Science U
- On-Demand
- Free Online Course
Universe or Multiverse?
5 reviews

Theoretical physicist Andrei Linde was responsible for proposing the ideas of an inflationary multiverse and eternal inflation. In this Master Class, Linde discusses the evolution of these ideas over the past decades and what the future of cosmology hold…
- World Science U
- On-Demand
- Free Online Course
History and Mysteries of the Universe
2 reviews

Max Tegmark, cosmologist and Professor of Physics at MIT, delivers a comprehensive look at the study of our universe, examining both the origin of our cosmos and the infinite questions waiting to be answered.
- World Science U
- On-Demand
- Free Online Course
The Early Universe

The first part of the course deals with the classical cosmology, and later part with modern particle physics and its recent impact on cosmology.
- MIT OpenCourseWare
- 29 hours
- On-Demand
- Free Video

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