Our Flat Solar System

Why is our solar system flat? We started off as a shapeless blob of gases after the Big Bang. How did our solar system flatten out? From Saturn's rings to other galaxies, it turns out that "flatness" is common in our 3D universe. It has to do with collisions.


MinutePhysics breaks down the mathematics for our 3D-thinking brains:

Yug, age 7, and Alia, age 10, both entered Let Grow's "Independence Challenge" essay contest.

Photos: Courtesy of Let Grow
Sponsored by Charles Koch Foundation
  • The coronavirus pandemic may have a silver lining: It shows how insanely resourceful kids really are.
  • Let Grow, a non-profit promoting independence as a critical part of childhood, ran an "Independence Challenge" essay contest for kids. Here are a few of the amazing essays that came in.
  • Download Let Grow's free Independence Kit with ideas for kids.
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Divers discover world's largest underwater cave system filled with Mayan mysteries

Researchers in Mexico discover the longest underwater cave system in the world that's full of invaluable artifacts. 

Divers of the GAM project. Credit: Herbert Meyrl.
Technology & Innovation

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Archaeologists find largest-ever Mayan complex hiding in plain sight

Researchers discover a massive ceremonial structure of the ancient Mayans using lasers.

3D image of the site of Aguada Fenix.

Credit: Takeshi Inomata
Surprising Science
  • Archaeologists use laser-based aerial surveys to discover the oldest and largest Mayan structure ever found.
  • The 3,000-year-old complex in the Mexican state of Tabasco was likely used as a ceremonial center.
  • Researchers think the site showed a communal society rather than one based on worshipping elites.
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Engineers 3D print soft, rubbery brain implants

Technique may enable speedy, on-demand design of softer, safer neural devices.

Dan Kitwood/Getty Images
Surprising Science

The brain is one of our most vulnerable organs, as soft as the softest tofu. Brain implants, on the other hand, are typically made from metal and other rigid materials that over time can cause inflammation and the buildup of scar tissue.

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