What exploded over Siberia in 1908, flattening millions of trees but leaving no crater?
Open the case filePhoto: Leonid Kulik, the expedition to the Tunguska event, Public domain
Space
Impacts, planets and the Moon, measured by the people who study them. 4 case files, each with its sources.
Did humans really walk on the Moon? Look at what they left behind.
Open the case filePhoto: NASA / Buzz Aldrin, Public domain
In 1976 NASA photographed a giant face on Mars. What did closer pictures reveal?
Open the case filePhoto: Viking 1, NASA, Public domain
How can a single day on Venus last longer than its whole year?
Open the case filePhoto: NASA/JPL, Public domain
Drag to turn the globe. Select a marker to open its case.
Space case files
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CONFIRMEDHumans Really Walked on the Moon: The Evidence They Left
Some people still say the Moon landings were faked. The astronauts left equipment that scientists still use, and an orbiter has photographed it.
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CONFIRMEDThe Face on Mars Was a Trick of the Light
In 1976 a NASA orbiter photographed what looked like a giant face on Mars. Sharper cameras showed what it really is.
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MOSTLY EXPLAINEDThe Tunguska Event: The Blast That Flattened a Forest
In 1908 an explosion over Siberia knocked down millions of trees across 830 square miles. No crater was ever found.
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CONFIRMEDOn Venus, a Day Lasts Longer Than a Year
Venus takes longer to spin once than to circle the Sun, and the Sun rises in the west.
How we check every story
We work from primary sources: original records, peer-reviewed research, space agencies, museums and government documents. Each case shows its sources and ends with an honest verdict. When something is unexplained, we say so.