Gem Homeworld scaled one in 120 million

This is an interpretation of how it could looks like the homeworld of the Gem race in Steven Universe show, usually referred as "Homeworld" or "Gem Homeworld", based on the first overview of this world in the episode "Legs From Here to Homeworld". There is a hollow and a filled version. The files, apart for the "hollow" models, are suited for 3D printing, but no for the assembly of the parts; that is, the rings has no support for mounting.

The size of the Homeworld

There is no real clue of the size, mass, nor nature of the system in which it is located. It is clearly hollowed in some way, like the Gems' final stage colonies. I first speculated about it size assuming it may be a white dwarf heavily exploited by its inhabitants, I made several guesses about the mass, the porosity and it gravitational attraction. However, when the Steven Universe TV movie came out, It could be seen, in the start credits, in an old-cartoon-style story book, that there was a comparison between Earth and the Homeworld. Although it is never said it is scaled, I take that as the most official reference to its size, being approximately 26% bigger in diameter than Earth.

The double ring system

A ring system with two oblique rings that close to each other is far impossible and unstable. Also if you measure them in the original picture, the outer edge of the inner ring is wider than the inner edge of the outer ring, so they overlap at least in one place. When I made the complete reconstruction following the original image I have to put the inner ring displaced from the center of mass (the center of the model), which is also impossible. One explanation could be that the inner ring is composed of ferromagnetic material (iron), and it is orbiting around the magnetic dipole. This is pure speculation, I don't know if it works like that. The magnetic poles are far displaced for the axis of rotation, since its irregular shape. The particles in a ring could be meters long, and separated by many times their sizes, so in the part that the rings cross each others, the particles could have little interaction, with occasional collisions. The bigger ring, that orbits the center of mass and is composed only of non-ferromagnetic bodies (stony and carbonaceous), suggests in which direction is the axis of rotation.

References

• Surf to STL function for MATLAB

I spend part of my time making these models, letting them available and free for everyone. If you want to support my work, you can contribute with me here:

Other astronomical objects

Object	Scale [1:x]       K = 103 (thousand) M = 106 (million) G = 109 (billion)	Image
Inner Solar System
Mercury	20M, 60M, 120M
Venus	60M, 120M, 250M
Earth	60M, 120M, 250M
Luna	10M, 20M, 60M
Mars	20M, 60M, 120M
Phobos and Deimos	200K, 500K
Man-made
Salyut 7	40, 48, 80, 160
Near Earth Asteroids
Moshup and Squannit	8K, 20K, 40K
Ra-Shalom	20K, 40K
Castalia	8K, 20K, 40K
Bacchus	8K, 20K
Bennu	3K, 8K
Ryugu	3K, 8K, 20K
Geographos	40K, 80K
Phaethon	40K, 80K
Itokawa	3K, 8K
Eros	80K, 200K,      500K
Nereus	3K, 8K
Didymos and Dimorphos	8K, 20K
Mithra	20K, 40K
Golevka	8K
Toutatis	40K, 80K
Main Asteroid Belt
Gaspra	200K
Annefrank	40K, 80K
Braille	20K, 40K
Vesta	2M, 4M, 10M
Šteins	40K, 80K, 200K
Iris	2M, 4M
Hebe	1M, 2M, 4M
Lutetia	500K, 1M, 2M
Julia	1M, 2M, 4M
Mathilde	500K, 1M
Juno	2M, 4M
Ceres	4M, 10M
Pallas	4M, 10M
Kleopatra	2M, 4M
Ida	500K, 1M
Psyche	2M, 4M
Interamnia	2M, 4M
Elektra	1M, 2M, 4M
Hygiea	2M, 4M, 10M
Antiope	1M, 2M
Jovian System
Jupiter	500M, 1G
Amalthea	2M, 4M
Thebe	1M, 2M
Io	20M, 60M
Europa	20M, 60M
Ganymede	60M, 120M
Callisto	60M, 120M
Saturn System
Saturn	500M,      1G
Pan, Daphnis and Atlas	80K, 200K, 500K, 1M
Prometheus and Pandora	1M, 2M
Janus and Epimetheus	2M, 4M
Mimas	2M, 4M, 10M
Methone, Anthe and Pallene	40K, 80K
Enceladus	4M, 10M
Tethys	4M, 10M, 20M
Telesto and Calypso	200K, 500K
Dione	4M, 10M, 20M
Helene	500K, 1M
Rhea	10M, 20M
Titan	60M, 120M
Hyperion	2M, 4M
Iapetus	10M, 20M
Phoebe	1M, 2M, 4M
Uranian System
Uranus	250M, 500M, 1G
Puck	1M, 2M, 4M
Miranda	4M, 10M
Ariel	10M, 20M
Umbriel	10M, 20M
Titania	10M, 20M
Oberon	10M, 20M
Neptunian System
Neptune	250M, 500M, 1G
Larissa	2M, 4M
Proteus	2M, 4M, 10M
Triton	20M
Comets
Tempel 1	40K, 80K, 200K
Wild 2	40K, 80K
Churyumov-Gerasimenko	20K, 40K, 80K
Hartley 2	20K, 40K, 80K
Borrelly	40K, 80K, 200K
Halley	80K, 200K
Centaurs and TNOs
Hidalgo	500K, 1M
Chariklo	2M, 4M
Pluto and Charon	10M, 20M
Styx, Nix, Kerberos and Hydra	500K, 1M
Haumea, Namaka and Hiʻiaka	10M, 20M
Arrokoth	200K, 500K, 1M
Largest TNOs and their moons	10M, 20M
Extrasolar
Exoplanets	120M, 250M, 500M
Nearest white dwarfs	120M, 250M
HD 189733 b	1G
Pulsars	200K, 500K
Cygnus X-1 accretion disk	10M, 20M
M87* photon ring	1.5*1014
Sky maps
Heliosphere	7.5*1013, 1.5*1014
Constellations	-
CMBR	2*1028
Ancient
Earth (540 Mya to 20 Mya)	60M, 120M, 250M
Luna (4 Gya)	20M, 60M
Speculative
Planet Nine	250M, 500M
Cube planet	60M, 120M, 250M
Science Fiction
Ghroth	4M, 10M
Arda	60M, 120M
Life Foundation rocket	160, 200, 350, 500
B612	10, 20, 32, 40
Mesklin	500M, 1G
Arrakis	60M, 120M
Borg cube	8K, 20K, 40K
Pern	60M, 120M
Europa Monolith	200K, 500K
Leonora Christine	500, 600, 1K, 3K
Rama	80K, 200K, 500K
Death Star	500K, 1M, 2M
Starkiller Base	2M, 4M, 10M
Z-95	40, 80, 160, 200
Eternia	60M, 120M
Rocheworld	20M, 60M
Visitors mothership	20K, 40K
Wheel of Time Earth	60M, 120M, 250M
Nirn, Secunda and Masser	20M, 60M, 120M
ID mothership	2M, 4M, 10M
ID troop transporter	200, 350, 500, 600, 1K
Heptapod spaceship	1K, 3K, 8K
Gaijin flowership	3K
Red Moon	60M, 120M
Halo Array	4M, 10M, 20M, 60M
Gem Homeworld	120M, 250M, 500M
Citadel of Ricks	200K
The Skeld	40, 80, 160, 200, 350, 500
Misc
Mars (1962 reconstruction)	60M, 120M
Flat Earth	250M
Expanding Earth	60M, 120M
Spaceship of Ezekiel	80, 160