1 Light Year Diameter Planet

As the others have said, without anti-gravity it won't work, with anti-gravity you can pretty much do whatever you want.

Just a few things to think about

With a diameter of 1 light year ($5.879\cdot {10}^{12}$ miles) you get a circumference of $1.85\cdot {10}^{13}$ miles, and a surface area of $1.09\cdot {10}^{26}$ square miles.

The Earth only has a surface area of $1.969\cdot {10}^8$ square miles, so this thing is going to be really really big. If you took a big bag of Earths and skinned them like oranges, you would need $5.535805\cdot {10}^{17}$ Earths to cover this monster.

The point is that heating and lighting the place is going to be hard. You'd essentially want fleets of Sun-sized stars orbiting the planet in order to keep things warm and to provide enough light to grow things.

If you only put them around the equator, one AU away from the surface and spaced them 2 AUs apart, you'd need $99,505$ suns to circle the planet. However you'd need more than one band to keep the place warm, so maybe 2 bands at the 45th parallels too...

Just to put the numbers in normal notation instead of scientific notation:

surface area of $1.09\cdot {10}^{26}=109,000,000,000,000,000,000,000,000$ square miles

$5.535805\cdot {10}^{17}=553,580,500,000,000,000$ times the surface area of Earth

posted about 9 years ago

AndyD273‭

1 reputation 8 213 1 0