The Solah Systum is a patch of space around the sun filled with loads of planets and
eggs moons and things, where Earth resides and houses its devil spawn. It's 99.99999999% the main setting of Doctor Who.
The sun is orbited by a few giant orb-like things called planets.
- Mercury - A rock. The Doctor once left a vampire there or something.
- Venus - If Earth were hell (so basically Earth). A type of karate and lullaby originate from there.
- Earth - Filled with war, famine, idiot presidents and vain pop stars, and orbited by a dragon egg, it's the Doctor's favourite place in the universe. Home to h00manz and sleepy green lizards.
- Mars - The red planet, which humans plan on laying waste to once they've finished shitting all over their own planet. Apparently home to a lot of dangerous fellows, like the other sleepy green lizards and evil water.
- Jupiter - A ball of gas with storms and moons and shit. Visited in a shit video game.
- Saturn - Remembered for having a ring. The Doctor once blew up one of its moons.
- Uranus - Kek. Mavic Chen once drilled it. Heh.
- Neptune - Has Devil Goblins, apparently.
- Pluto - An ice ball. Fuck you, it counts. Even in canon it's still a planet; K9, a computer from the year 5000, refers to it as the Ninth Planet, so there. Though speaking of that story, it was terraformed with 6 suns by a bald high-pitched voiced dwarf.
- Voga - Oh yeah, there was this thing too, a planet entirely made of gold which helped defeat the Cybermen. It got caught in Jupiter's orbit, which should technically make it a moon, but ah well screw technicality.
- Vulcan - It's not confirmed in the show if this is in Earth's Solar System, however there was a legit theory in real life of there being a planet called Vulcan within the orbit of Mercury, so I'm including it. Twas the first place the Second Doctor visited, where he blew up some Daleks.
- Mondas - Earth's long lost twin, got flung out of the system and the inhabitants had to adapt. Returned to the system in the 80s to steal energy, but then
got blown up melteddisintegrated.
- Gallifrey - If it appeared in the system, it was part of the system.
- Skaro - Implied to be in the Solar System in the Hartnell era (the Galactic Council refer to the Daleks as "the power from the Solar System" in Missionary Position to the Unknown), but it has since been retconned to be orbiting a different star, except not anymore, except yes it still is.
- Cassius -
One from the novels, so not-canon (as if everything else in this list is).It was mentioned briefly in the TV story The Sun Makers, so it's not just in the novels. Still non-canon though.
- Planet 14 - A planet briefly referenced in The Invasion, inhabited by Cybermen.
- Planet 5 - Put in a time lock by the Time Lords because it was home to the Fendahl.
If it wasn't obvious, the Doctor Who version of the Solar System has way more planets than its real life counterpart.