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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

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📍 How it ended

The story of a potential Mars-sized lost planet orbiting the Sun quieted after initial reports linked a rare meteorite found in the Sahara Desert to evidence of such a protoplanet. Coverage focused on the meteorite’s age and composition as a possible clue to its origins, but no further developments or confirmations emerged.

The trend faded without a definitive resolution in subsequent reports.

Epilogue added 41d ago, after coverage quieted.

The brief

A meteorite discovered in the Sahara Desert contains evidence suggesting the existence of a lost protoplanet—nearly the size of Mars—that once orbited the Sun. The rare specimen, estimated to be 4.5 billion years old, exhibits chemical and isotopic signatures inconsistent with known solar system bodies, according to early analysis.

Coverage from *Scientific American*, *Smithsonian Magazine*, and *Universe Today* highlights the meteorite’s potential to rewrite early solar system history. Researchers describe it as the first physical clue to a protoplanet that may have been destroyed or ejected during the solar system’s violent formation.

Watch for follow-up studies on the meteorite’s composition and implications for planetary migration theories. If confirmed, this could reshape models of how Earth and other planets formed.

Synthesized by PULSE from the headlines below under a strict no-invention contract. ✓ fact-checked: unsupported claims removed (75% supported) Updated 42d ago.

Quick answers

What makes this meteorite different from others?

Its isotopic ratios and mineral composition suggest it originated from a distinct, now-extinct planetary body—unlike fragments from asteroids, Mars, or the Moon.

Could this protoplanet have affected Earth’s formation?

Coverage does not yet specify, but its destruction may have contributed to the chaotic early solar system dynamics that shaped planetary orbits.

Where was the meteorite found?

It was discovered in the Sahara Desert, a known hotspot for meteorite recovery due to its arid conditions and dark rock contrast.

Coverage (6)

Topics

solar system archaeology protoplanet hypothesis Sahara meteorite planetary science early solar system isotopic analysis

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