Free About 1 hr0 learners Rev. 2026-10-28 0

In 1964 two radio astronomers in New Jersey scrubbed pigeon droppings out of their antenna, trying to silence a faint hiss that would not go away. The hiss turned out to be the oldest light in the universe. A century earlier, a philosopher had declared that no one would ever know what the stars are made of, and within a generation chemists read the answer in a rainbow of sunlight. Astronomy is full of moments like these, when patient people looked up, measured carefully and found the universe far larger and stranger than anyone had guessed.

This course takes you on that journey. You will start with the sky our ancestors watched, learn why the Earth was moved out of the center, and discover how light carries messages across billions of years. You will tour the planets, follow stars from birth to death, and see how a few pulsing stars revealed a universe of galaxies rushing apart. You will weigh the evidence for the Big Bang, meet the thousands of worlds now known around other stars, and end with the oldest question of all: are we alone, and what does our place in the cosmos ask of us?

Levels

  1. 1 1. Looking Up: The Sky Our Ancestors Knew 5-question quiz
  2. 2 2. Moving the Earth: From Copernicus to Newton 5-question quiz
  3. 3 3. Light: The Messenger from the Stars 5-question quiz
  4. 4 4. Our Solar System 5-question quiz
  5. 5 5. The Lives of Stars 5-question quiz
  6. 6 6. Galaxies and the Expanding Universe 5-question quiz
  7. 7 7. The Big Bang and Cosmic History 5-question quiz
  8. 8 8. Are We Alone? Exoplanets, Life and Our Place 5-question quiz

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