NASA Mega-Rocket Could Lead to Skylab 2 Deep Space Station

NASA's first manned outpost in deep space may be a repurposed rocket part, just like the agency's first-ever astronaut abode in Earth orbit.

With a little tinkering, the upper-stage hydrogen propellant tank of NASA's huge Space Launch System rocket would make a nice and relatively cheap deep-space habitat, some researchers say. They call the proposed craft "Skylab II," an homage to the 1970s Skylab space station that was a modified third stage of a Saturn V moon rocket.

"This idea is not challenging technology," said Brand Griffin, an engineer with Gray Research, Inc., who works with the Advanced Concepts Office at NASA's Marshall Space Flight Center in Huntsville, Ala.

"It's just trying to say, 'Is this the time to be able to look at existing assets, planned assets and incorporate those into what we have as a destination of getting humans beyond LEO [low-Earth orbit]?'" Griffin said Wednesday (March 27) during a presentation with NASA's Future In-Space Operations working group. [Gallery: Visions of Deep-Space Stations]

A roomy home in deep space

NASA is developing the Space Launch System (SLS) to launch astronauts toward distant destinations such as near-Earth asteroids and Mars. The rocket's first test flight is slated for 2017, and NASA wants it to start lofting crews by 2021.

The SLS will stand 384 feet tall (117 meters) in its biggest ("evolved") incarnation, which will be capable of blasting 130 metric tons of payload to orbit. Its upper-stage hydrogen tank is big, too, measuring 36.1 feet tall by 27.6 feet wide (11.15 m by 8.5 m).

The tank's dimensions yield an internal volume of 17,481 cubic feet (495 cubic m) roughly equivalent to a two-story house. That's much roomier than a potential deep-space habitat derived from modules of the International Space Station (ISS), which are just 14.8 feet (4.5 m) wide, Griffin said.

The tank-based Skylab II could accommodate a crew of four comfortably and carry enough gear and food to last for several years at a time without requiring a resupply, he added. Further, it would launch aboard the SLS in a single piece, whereas ISS-derived habitatswould need to link up multiple components in space.

Because of this, SkylabII would require relatively few launches to establish and maintain, Griffin said. That and the use of existing SLS-manufacturing infrastructure would translate into big cost savings a key selling point in today's tough fiscal climate.

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NASA Mega-Rocket Could Lead to Skylab 2 Deep Space Station