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📘 The Tunguska event

At 7:15, above the Podkamennaya Tunguska River, a fireball crossed Siberia and exploded above the forest. Witnesses felt heat, pressure, and thunder; the ground showed the rest.

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

What you’ll learn

  1. A morning that became a fireballReconstruct the eyewitness and atmospheric evidence from June 30, 1908.A brilliant fireball, heat, pressure wave, and distant atmospheric glow announced a disaster over a remote Siberian forest.
  2. Reading the forest like a seismographUse tree-fall direction, burning, and expedition maps to infer the event's shape and source.The forest preserved a radial signature of an aerial explosion even though no crater was found.
  3. What exploded above Siberia?Explain the airburst model and why asteroid, comet, size, and composition remain partly uncertain.A tens-of-metres-wide body likely released its energy high in the atmosphere, leaving clues but no universally accepted fragment.
  4. From cold case to planetary defenseConnect historical investigation to modern near-Earth-object tracking and risk reduction.Maps, fieldwork, remote sensing, and models turned an old mystery into a continuing lesson in planetary defense.

Questions this course answers

Why did the event leave no obvious impact crater?

The leading explanation is an atmospheric airburst, so the energy was released above the forest.

What did the radial pattern of fallen trees help investigators infer?

Trees pointing away from a central zone fit a blast wave spreading outward.

Why is the exact Tunguska object still uncertain?

Scientists have evidence for an airburst but no agreed surviving meteorite fragment that identifies the body precisely.

What is the modern planetary-defense lesson of Tunguska?

Tunguska shows that an airburst from a relatively small object can cause regional destruction.

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