NASA envisions a city of solar-powered helium airships above Earth's searing hot twin.
The High Altitude Venus Operational Concept program would eventually send a manned mission to the atmosphere of Venus.
Around 30 miles above the surface, Venus has temperatures and atmospheric pressure reminiscent of Earth's.
A robot would first be sent to the Venus' atmosphere to test the waters -- a two-manned vehicle would follow.
A robot would first be sent to the Venus' atmosphere to test the waters -- a two-manned vehicle would follow.
The project could one day pave the way toward a floating city above Venus
