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"If we're going to be consistent and advocate freedom of speech we have to advocate freedom of encrypted speech too. The genie is out of the bottle, cryptologically."
- Neal Stephenson
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| Rotating Hollow Planetoid Habitat | ||
| An asteroid (or planetoid) hollowed out, spun for artificial gravity, used as a habitat. |
This is an early expression of this idea; using the solid metal core of an ancient planet actually works better than an asteroid.
| It was nearly twenty-four hours later that they finally approached their destination, a tiny, five-mile world of solid metal, a part of the nickel-steel core of some long vanished planet. Its surface turned swiftly beneath them, flashing around in moments as they watched, a surface made up of great crags and clefts of metal, broken, barren masses of metal. “Lord — it would be impossible to establish a city on the surface of that top!” exclaimed one of the Patrolmen. “The centrifugal spin there would throw anything off into space.” “How about the inside of it then?” asked one of the guards, smiling at him... "...When the colony was established, the whole interior was carved out with atomic burners — burned the stuff out into gas, and let it escape. The shell’s about half a mile thick. Inside, the centrifugal force gives an acceleration just equal to one earth gravity, we’re up to speed, and you can see we have about an earth-weight away from it now. And an artificial sun gives plenty of light.” |
| Technovelgy from Electronic Siege,
by John W. Campbell. Published by Wonder Stories in 1932 Additional resources -
|
Many asteroids are just piles of rubble, held together by what little gravity comes from the mass of the objects. It wouldn't be possible to spin them for artificial gravity, or to excavate them.
This idea resurfaced in the 1960's:
For a very early use of the phrase, see hollow asteroid (1944) from Juke Box Asteroid by Joseph Farrell.
Hollowed-out asteroid habitats are also called "Cole bubbles" after Dandridge Cole. (See also the section asteroid habitats in Project Rho. Thanks also to @fredkiesche for tips.)
In 1963, Dandridge Cole wrote Exploring the Secrets of Space: Astronautics for the Layman with I. M. Levitt. In this book they suggested hollowing out an ellipsoidal asteroid about 30 km long, and rotating it about its major axis to simulate gravity. By reflecting sunlight inside with mirrors, and creating, on its inner surface, a pastoral setting an asteroid could be transformed into a permanent space colony. Cole and Cox also envisioned that asteroids would provide the raw materials to form the basis of a spacefaring civilization. And, that asteroidal materials would also serve terrestrial needs. In their view these materials could be transported using mass drivers or linear motors. Cole’s work largely presages that of Gerard K. O’Neill by more than a decade.
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Additional
resources:
More Ideas
and Technology from Electronic Siege
More Ideas
and Technology by John W. Campbell
Tech news articles related to Electronic Siege
Tech news articles related to works by John W. Campbell
Rotating Hollow Planetoid Habitat-related
news articles:
- Is A Hollow Rotating Asteroid Habitat Practical?
- Restructure An Asteroid, Spin It, Get A 'Space Habitat' With Gravity?
| Tumblin' Tumbleweed Rovers To Eplore Mars |
| Tentacled Robot Captures Space Debris |
| Reflect Orbital Sunlight On Demand |
| Elon Musk Wants Data Centers In Space |
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'Looks like she has bought the Avatar Construction Set and put together her own...'
'Across the ground something small and metallic came, flashing in the dull sunlight of midday.'
'A broken circle with arrows pointing to a right-hand flow appeared in the chalf.'
'The object seemed melted together like wax — nothing was distinguishable.'
'Midges have many capabilities. To the untrained eye, they look like sparrows.'
'I made disks of my own voice to the number of five hundred very carefully chosen words.'
'His sensors out and working, and the whirring of the tape that sucked up sight and sound and shape and smell and form...'
