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GetSet · Destination Space · Session 11

The Great Silence

There are hundreds of billions of stars in our galaxy alone. So if alien life is out there, why haven’t we heard from anyone? This session gives you the tools scientists use to estimate the odds of intelligent life, and digs into the puzzle known as the Great Silence. Crunch the numbers, then decide for yourself: are we alone?

Guessing the Galactic Odds
Identify the key variables in the Drake Equation and explain which ones scientists can measure and which remain unknown.
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The Great Silence
Identify at least three possible explanations for the Great Silence and explain which they find most convincing and why.
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Extension 1. How Bats Use Sound
Scientists use radio telescopes to listen for signals from intelligent life, searching for something they cannot see. Learn how one remarkable bat has been doing something similar for millions of years, just to find its next meal.
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Extension 2. Impossible to Intercept
Discover the Hollywood star who helped invent a communication system that would change the world forever.
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Guessing The Galactic Odds Minigame

Guessing The Galactic Odds Minigame

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