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New models rethink the insides of Uranus and Neptune (Level A1) — a tent in the snow with mountains in the background

New models rethink the insides of Uranus and NeptuneCEFR A1

15 Dec 2025

LevelA1
A2
B1
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Adapted from U. Zurich, Futurity • CC BY 4.0

Photo by ruedi häberli, Unsplash

Level A1 – Beginner
2 min
78 words
  • Scientists study Uranus and Neptune with new models.
  • The planets used to be called ice giants.
  • New research says this label is too simple.
  • The team made a new simulation process.
  • They start with a random density for the inside.
  • Then they match the model to gravity data.
  • Results show the inside may be rock-rich.
  • Or the inside may be water-rich instead.
  • Models also explain the strange magnetic fields.
  • Scientists say we need spacecraft missions now.

Difficult words

  • model — a plan that shows how something works
    models
  • simulation — a computer test that copies real events
  • density — how much mass is in a volume
  • gravity — the force that pulls things down or together
  • magnetic field — an invisible area that affects magnets and metal
    magnetic fields
  • spacecraft — a vehicle made to travel in space

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Which planet is more interesting to you, Uranus or Neptune?
  • Would you like to go on a spacecraft mission?
  • Have you heard about magnetic fields before?

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