▲ Peaking
Science
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Uranus, Neptune May Be Magma Worlds, Not Ice Giants
Scientists propose Uranus and Neptune host magma oceans, challenging the classic ice‑giant view
Planetary Science
2 trends tracked about this subject — the full history, oldest to newest below.
◼ Archived
Science
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A Lost World Almost as Big as Mars May Have Once Orbited Our Sun
A 4.5-billion-year-old meteorite in the Sahara hints at a vanished Mars-sized world in our solar system’s early days