Our World, Other Worlds

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Three rounds: Quick Start, Risk or Reward, and a final wager. Questions have a 20-second answer clock; the final question has 30 seconds. There is no pause.

Use each lifeline once: 50/50 removes two wrong answers; Ask the Hosts removes one. Only one lifeline per question.

Safe earns 100 points without a loss. Bold risks 250 points and needs a 250-point balance. All In doubles or loses your balance and needs more than 250 points. The final wager uses 50-point steps.

Local results are not saved or ranked. Once loaded, play continues offline. Refresh or leaving starts over.

About 1 minute with sound off at a quick answering pace. Allow longer with narration. About this estimate

Show icon for Our World, Other Worlds Our World, Other Worlds

Test your knowledge of how Earth is different from other planets.

Sample questions


  1. Exoplanets that have a lot of volcanic activity and exist in systems with many asteroids are bad prospects for looking for extraterrestrial life.
  2. Earth and Venus are rocky planets of about the same size, but Earth's average surface temperature is about 59° F, while Venus' is 1,350° F, hot enough to melt lead or aluminum. Why the difference?
  3. Earth is the only body in the solar system thought to have oceans of liquid water.

Use the Start Show button above to start playing!

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