Ingenuity helicopter Mars blade speed thin atmosphere

Ingenuity spun its blades fast on Mars

Nearly 3,000 Rpm

NASA’s 1.8-kilogram Ingenuity helicopter flew in an atmosphere 100 times thinner than Earth’s. Its blades spun at about 10 times the speed of a helicopter on Earth.

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Most of Earth's volcanoes are underwater

Much of Earth's volcanic activity happens where tectonic plates meet on the ocean floor. As a result, most of the planet's volcanoes are underwater rather than on land.

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~14 centuries

Caesar and Augustus became titles for rulers

The name Caesar and the title Augustus became titles used by Roman rulers for centuries. Caesar also gave rise to later ruler titles such as the German kaiser and Russian tsar.

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