Free Course Image General Astronomy

Free online courseGeneral Astronomy

Duration of the online course: 15 hours and 56 minutes

New course

Explore General Astronomy with Spahns Science! Learn about the universe's history, celestial patterns, planetary geology, star life cycles, and more in this comprehensive online course.

In this free course, learn about

  • Foundations of Astronomy
  • Observing the Sky and Earth–Sun–Moon System
  • The Solar System and Its Formation
  • Geology of the Terrestrial Worlds
  • Planetary Atmospheres and Climate
  • Radiation, the Sun, and Stellar Properties
  • Star Formation and Evolution
  • Stellar End States: White Dwarfs, Neutron Stars, and Black Holes

Course Description

Welcome to "General Astronomy," a comprehensive course designed to immerse you in the captivating world of astronomy. Spanning 15 hours and 56 minutes, this course is a meticulously structured journey through the various phases and concepts that define this scientific field. Though categorized under "Others," it specifically delves into the rich and intriguing subcategory of Astronomy. Whether you are a budding astronomer or simply a science enthusiast, this course has something to captivate your intellectual curiosity.

The course begins with an introductory lecture that sets the stage for your astronomical pursuits. It offers a historical framework with "The Ancient Views of the Heavens," followed by a closer look at "The Copernican Revolution," guiding you through the very inception of astronomical thought and its evolution over the centuries. "Making Sense of the Universe" and "Patterns in the Night Sky" are designed to help you understand the celestial patterns and theories that have been observed and formulated over time.

Understanding cosmic phenomena such as "The Reason for Seasons" and "Eclipses and the Motion of the Moon" provides you with foundational knowledge about Earth's relationship with the cosmos. A "Tour of the Solar System" and "The Origin of the Solar System" take you on an exploratory adventure across various celestial bodies orbiting our Sun, preparing you for deeper insights into planetary formation and geology.

The segment on planetary geology, beginning with "An Introduction to Planetary Geology" and proceeding to the "Geology of the Terrestrial Planets" and "The Unique Geology of Earth," examines the physical characteristics and geological activities of planets, with a special focus on Earth. This is seamlessly woven into a discussion on planetary atmospheres, offering lectures on "Earth's Atmospheric Structure and Magnetic Field" and the "Atmospheres of the Terrestrial Planets."

Advanced topics like "Earth's Atmospheric History and Climate Change" explore the evolution of Earth's atmosphere and the climatic shifts that have occurred over millennia. The course then transitions to a thorough examination of light and its properties, including "The Nature of Light" and "Learning From Light," elucidating how astronomers use light to gather information about distant celestial objects.

The course also covers the Sun's fascinating properties, with lectures on "Why the Sun Shines" and "The Structure of the Sun," before moving on to stellar phenomena with "The Nature of the Stars" and "Stellar Classification and the H-R Diagram." These sections are key to understanding the lifecycle of stars, including "The Formation of a Protostar," "The Evolution of a Protostar," and the various stages of "The Lives of Stars."

Explorations into the "Fates of Low and Intermediate-Mass Stars" and "The Fates of High-Mass Stars" will deepen your understanding of stellar end stages, such as "Neutron Stars and Black Holes." Each lecture builds a solid foundation while engaging you with the mysteries and wonders of the universe, making "General Astronomy" a comprehensive and enriching educational experience.

Course content

  • Video class: General Astronomy: Lecture 1 - Introduction 57m
  • Exercise: What unit of measurement is used to describe the average distance between the Earth and the Sun?
  • Video class: General Astronomy: Lecture 2 - The Ancient Views of the Heavens 26m
  • Exercise: According to ancient Greek beliefs, which celestial body did NOT exhibit retrograde motion?
  • Video class: General Astronomy: Lecture 3 - The Copernican Revolution 23m
  • Exercise: What was the key flaw in Copernicus's model that affected its accuracy in predicting planetary positions?
  • Video class: General Astronomy: Lecture 4 - Making Sense of the Universe 40m
  • Exercise: What law explains why passengers feel no sensation of motion while traveling in an airplane on a smooth flight?
  • Video class: General Astronomy: Lecture 5 - Patterns in the Night Sky 35m
  • Exercise: How do astronomers define the term 'constellation'?
  • Video class: General Astronomy: Lecture 6 - The Reason for Seasons 23m
  • Exercise: What causes the varying lengths of daytime and nighttime experienced on Earth?
  • Video class: General Astronomy: Lecture 7 - Eclipses and the Motion of the Moon 31m
  • Exercise: What term describes the moon's rotation that results in the same hemisphere always facing Earth?
  • Video class: General Astronomy: Lecture 8 - A Tour of the Solar System 41m
  • Exercise: Which planet's orbit is most nearly a perfect circle?
  • Video class: General Astronomy: Lecture 9 - The Origin of the Solar System 25m
  • Exercise: What process explains how the gravitational energy of a contracting cloud of gas is converted into thermal energy during the formation of a star?
  • Video class: General Astronomy: Lecture 10 - The Formation of the Planets 28m
  • Exercise: Which region of the early solar nebula was cold enough for hydrogen compounds such as water, methane, and ammonia to condense into solid ices, thus setting the stage for the formation of jovian planets?
  • Video class: General Astronomy: Lecture 11 - An Introduction to Planetary Geology 42m
  • Exercise: Which factor is the most significant in determining the geological activity of a terrestrial world?
  • Video class: General Astronomy: Lecture 12 - Geology of the Terrestrial Planets 38m
  • Exercise: What is the primary reason the Mare regions on the Moon have fewer craters compared to the Highlands?
  • Video class: General Astronomy: Lecture 13 - The Unique Geology of Earth 23m
  • Exercise: What is the primary reason for the constant shaping and reshaping of Earth's surface?
  • Video class: General Astronomy: Lecture 14 - An Introduction to Planetary Atmospheres 25m
  • Exercise: What is the primary reason Venus has such high surface temperatures?
  • Video class: General Astronomy: Lecture 15 - Earth's Atmospheric Structure and Magnetic Field 29m
  • Exercise: Which atmospheric layer of Earth is characterized by an increase in temperature with altitude due to the absorption of ultraviolet radiation by ozone?
  • Video class: General Astronomy: Lecture 16 - Atmospheres of the Terrestrial Planets 30m
  • Exercise: How do the exospheres of the Moon and Mercury contribute to the appearance of the sky on their surfaces during daylight?
  • Video class: General Astronomy: Lecture 17 - Earth's Atmospheric History and Climate Change 40m
  • Exercise: Which human activity has been responsible for the increase in carbon dioxide levels affecting the Earth's climate according to the lecture?
  • Video class: General Astronomy: Lecture 18 - The Nature of Light 27m
  • Exercise: What is the speed of light in a vacuum?
  • Video class: General Astronomy: Lecture 19 - Learning From Light 31m
  • Exercise: When astronomers observe the spectrum of a distant star, what can they determine about the star from the presence of absorption lines in its spectrum?
  • Video class: General Astronomy: Lecture 20 - Why the Sun Shines 34m
  • Exercise: Which of the following is NOT a reason why the Sun's core temperature sustains nuclear fusion?
  • Video class: General Astronomy: Lecture 21 - The Structure of the Sun 37m
  • Exercise: What occurs during the sunspot cycle in terms of sunspots forming at different latitudes on the Sun?
  • Video class: General Astronomy: Lecture 22 - The Nature of the Stars 28m
  • Exercise: What is the significance of the inverse square law for light in astronomy?
  • Video class: General Astronomy: Lecture 23 - Stellar Classification and the H-R Diagram 32m
  • Exercise: Which property of main-sequence stars is directly correlated with their luminosity?
  • Video class: General Astronomy: Lecture 24 - The Formation of a Protostar 23m
  • Exercise: Which term refers to regions in space where young stars are formed and are recognizable by their dense concentrations of gas and dust?
  • Video class: General Astronomy: Lecture 25 - The Evolution of a Protostar 30m
  • Exercise: Which of the following stellar evolutionary tracks on the Hertzsprung-Russell (HR) diagram is correct for varying stellar masses?
  • Video class: General Astronomy: Lecture 26 - The Lives of Stars 40m
  • Exercise: What element serves as the 'ash' of helium fusion in the cores of stars?
  • Video class: General Astronomy: Lecture 27 - The Fates of Low and Intermediate-Mass Stars 26m
  • Exercise: What is the ChandraSekhar limit?
  • Video class: General Astronomy: Lecture 28 - The Fates of High-Mass Stars 34m
  • Exercise: What is the minimum initial mass required for a star to potentially leave behind a neutron star after a supernova explosion?
  • Video class: General Astronomy: Lecture 29 - Neutron Stars and Black Holes 43m
  • Exercise: What determines whether the core remnant of a supernova explosion will become a neutron star or a black hole?

This free course includes:

15 hours and 56 minutes of online video course

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