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📘 Venus: the planet that went wrong

Look outside at dusk and find Venus shining brighter than any star. Its rocky size resembles Earth's, but its hidden ground is hot enough to melt lead. That contrast is the doorway into the course.

4
lessons
~20 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. A sister planet with a different fateCompare Venus and Earth and explain why similar rocky planets can diverge.Size and composition link the planets, while water history, rotation, and atmosphere helped send them down different climate paths.
  2. The atmosphere became the furnaceExplain Venus's greenhouse effect, clouds, pressure, and super-rotation.A dense carbon-dioxide atmosphere and high cloud deck trap heat while fast winds circulate far above a slow surface.
  3. Under the clouds, a young volcanic surfaceUse Magellan radar and Venera surface data to describe Venusian geology.Radar and landers reveal volcanic plains, complex highlands, and a geologically young surface hidden beneath clouds.
  4. How we test the storySeparate established observations from hypotheses and identify how missions test Venus's history.Future measurements connect gases, clouds, surface changes, and interior structure to test how Venus became so extreme.

Questions this course answers

Why is Venus a useful comparison with Earth?

Their broad physical similarity makes the divergence in atmosphere, water, and climate scientifically revealing.

What feedback helped Venus become drier?

More heat can add water vapor; ultraviolet splitting and hydrogen escape then reduce the water supply.

Why can bright Venus still have a very hot surface?

Reflectivity and greenhouse trapping act on different parts of the energy budget.

What is atmospheric super-rotation on Venus?

Venus's cloud-level atmosphere circles the planet in about four days while the solid planet rotates in 243.

How did Magellan map Venus beneath its clouds?

Radar can map surface roughness and elevation through the opaque cloud layer.

What does extensive volcanism imply about Venus's surface history?

Large volcanic plains and flows show that resurfacing has repeatedly rewritten the visible geology.

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