- Mini‑Neptunes are a little smaller than Neptune in size.
- They have rock and metal inside their cores.
- A thick atmosphere of hydrogen and helium surrounds them.
- Scientists often thought these planets had global magma seas.
- The new study used telescope observations and computer models.
- James Webb observed GJ 1214 b and its atmosphere.
- Heavier atmospheres add weight and cause extreme surface pressure.
- Under such pressure molten rock can become solid again.
Difficult words
- atmosphere — layer of gas around a planet
- cores — the central inside part of a planet
- magma — very hot liquid rock under a surface
- telescope — tool to look at distant space objects
- pressure — force on a surface from weight or gas
- molten — very hot and melted, not solid
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- Have you ever looked at the sky with a telescope?
- Do you want to learn more about planets?
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