It's well known that because the gravitational attaction at one point on the inside of a hollow shell is zero, because it is cancelled by the attraction from all the other points on the interior. ...
I am working on a roleplaying campaign guide set inside a Dyson Sphere. It's a solid shell around a star like our own and is 300 million kilometers across centered on the star. The atmosphere hugs ...
I have heard the phrase hollow world several times, but seeing the question "Does the Song of Ice and Fire take place in a hollow world?," inspired me to finally Google the topic. This led to a TV ...
In the ringworld-novels of Larry Niven the author uses a giant ring around the sun as setting. The concept that is going more extrem in this direction is a Sphere around a sun. That concept is called ...