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Astronomy

Unlock cosmic wonders, from star life cycles to the fate of the universe.

The universe consists of over 100 billion galaxies like ours, each containing tens or hundreds of billions of stars. This course will highlight what we know (and what is still unknown) about this vast and varied frontier.

By the end of this course, you’ll have discovered a world of cosmic wonders, followed a star from diffuse nebula to dense star remnant, traversed the scales of space and time from planetary to intergalactic, and crunched data to determine the Universe's ultimate fate.

Interactive
quizzes

30

Concepts and
exercises

330+
  1. 1

    Astronomy Toolbox

    Gear up with the basic physics tools that astrophysicists use to understand the universe.

    1. Matter

      A quick review of temperature, density and the ideal gas law.

    2. Gravity

      The primary driver of star cycles, planetary motion, and galactic evolution.

    3. Radiation

      Light and other types of radiation are our window into the Universe.

    4. HR Diagram

      What does a star's color have to do with its size?

  2. 2

    Sizing the Universe

    Here we develop meter sticks to measure the cosmos, starting with insights from the ancient Greeks.

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      Greek Estimates

      The Greeks first estimated the distance to the Moon over 2,000 years ago. How did they do it?

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      Trigonometric Parallax

      This clever geometric trick can reveal how far we are from distant stars.

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      Standard Candles

      Meet standard candles, the brightness benchmarks of the Universe.

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      Apparent Magnitudes

      Learn about the logarithmic scale astronomers use to classify the brightness of stars.

  3. 3

    Life Cycles of Stars

    Everything on Earth is made of the remnants of stars. Find out how stars consume matter as they live and die.

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      Star Formation

      When there's too much dust in one place, you might just end up with a black hole.

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      Static Stars

      Build a simple model of a star that gives predictions about its core temperature.

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      Energy Production in Stars

      The Sun releases more energy in an instant than Earth uses in a year.

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      Solar Energy Transport

      Follow the trail of energy as light escapes the core of the Sun.

  4. 4

    Worlds Beyond Earth

    Is extraterrestrial life possible? Could we live anywhere other than Earth? We don't know yet, but we're looking.

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      Goldilocks Zone

      This planet's too cold, that one's too hot, where do you find one that's just right?

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      Exoplanets

      How would an exoplanet look in a telescope? How would a grain of sand look from a kilometer away?

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      Transits

      We've found 2,000+ exoplanets with the method in this quiz, but there are many more we've missed...

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      Gravitational Wobble

      Every planet is in a gravitational tug-of-war with its star. How does this affect the light we see?

  5. 5

    Cosmology

    The fate of our universe is decided by matter we cannot see. Its identity is one of the great mysteries of our time.

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      Cosmological Principle

      Homogeneous? Isotropic? Learn the basics of cosmology.

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      The Fate of the Universe

      The Universe is expanding, but will gravity ever reel it in?

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      Dark Matter

      Gravity moves galactic matter in a predictable way, but we can't see most of it.

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      Cosmic Microwave Background

      A signal from the beginning of the Universe...