funfact.wiki
AboutGuidelinesTermsPrivacyContact

Content is available under CC BY-SA 4.0.

The Sun's outer corona reaches 1-2 million C, while the s... | funfact.wiki | funfact.wiki
The Sun's outer corona reaches 1-2 million C, while the surface below is only about 5,500 C. This paradox—getting hotter farther from the heat source—was discovered in 1939 and remains unresolved nearly 90 years later.
  • Sun
  • Corona
  • Astronomy
  • Physics
0
DiscussionHistory

Related Cards

Hot water can freeze faster than cold — a phenomenon called the Mpemba effect. Known since Aristotle but still unexplained, it was named after Tanzanian student Erasto Mpemba, whose question physicist Denis Osborne took seriously enough to research together.
  • Water
  • Mpemba effect
  • Aristotle
  • Physics
  • Ice
0
Earth has 365 days in a year, but actually rotates 366 times. The extra rotation comes from its orbit around the Sun — an example of the coin rotation paradox.
  • Earth
  • Sun
  • Rotation
  • Astronomy
  • Coin rotation paradox
0
In 1818, Siméon Denis Poisson argued that if light were a wave, a bright spot should appear at the center of a circular object's shadow — which he thought was absurd. But when Arago actually ran the experiment, the bright spot appeared, proving light's wave nature.
  • Siméon Denis Poisson
  • Light
  • Wave
  • Shadow
  • Physics
  • Diffraction
0
A train's left and right wheels share one axle, always spinning together. Yet turns are possible because the wheels are conical. On a curve, centrifugal force shifts the train, changing each wheel's contact diameter and allowing a smooth turn.
  • Train
  • Wheel
  • Physics
0
A straw can only suck water up about 10 meters. So how do trees over 100m tall move water to the top? The secret is transpiration: as water exits the leaves, molecular cohesion pulls the column up like a chain. Trees use 95% of their water just for this.
  • Tree
  • Transpiration
  • Physics
  • Plant
0