- NASA is studying the possibility of sending a manned mission into the relatively benign atmosphere of Venus
- The concept involves sending an aeroshell that would contain a folded helium airship in the planet's atmosphere
- At 30 miles above the planet's surface, the gravity, atmosphere and radiation protection is similar to that of Earth
- The space agency says the mission could involve creating a floating blimp city for a permanent manned presence
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(CNN)Imagine a blimp city floating 30 miles above the scorching surface of Venus -- a home for a team of astronauts studying one of the solar