Meet Calypso, a daredevil mission concept to explore the surface of Venus

Of all the rocky, inner worlds of the solar system, Venus is the most challenging to explore. 

With surface temperatures reaching a bewildering 867 degrees Fahrenheit (464 degrees Celsius), even the most hardened landers can’t survive for long. But a new idea, called the Calypso Venus Scout, calls for a bold new mission design: a science probe dangling 20 miles (32 kilometers) below a cloud-borne balloon. 

Welcome to hell

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