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You might want to read the answers to this question. And there is a blog called PlanetPlanet about planetary formation. It has some sections about science fiction worlds. It has a section called Ulti …

Seven points to consider: ONE: Obviously the planet Earth has a companion object, the Moon, which looks like the Moon in the sky. Obviously at any one moment the Earth will be as far from the Moon …

According to these calculators: https://philip-p-ide.uk/doku.php/blog/articles/software/surface_gravity_calc https://www.calctool.org/astrophysics/escape-velocity Such a world would have a surface gravity …

Here is a link to a similar question about what would happen to Earth if Pluto exploded. Aliens blew up Pluto so we would stop debating whether or not to call it a planet, what happens to Earth? In my …

Most spaceships in "space opera" science fiction movies are badly designed. Written science fiction is more likely to use better designed starships than movies and television, but includes many that …

Short Answer: The original question asks for two double planets orbiting in each other's L4 and L5 positions. There is no known example of such an orbit, whether the two bodies are single or binary …

Would this barrier affect the Solar sysem's heliopshere? The heliosphere is the magnetosphere, astrosphere and outermost atmospheric layer of the Sun. It takes shape in form of a vast, bubble-like re …

This answer will be divided into several parts. In this story, I would want two planets that are both large enough to support life, but don't have to be the same or close in size. Do you want your p …

The question asks how to save Earth by moving it father from the Sun, and there are some answers how to do that. But of course there are other ways to keep Earth cool. Put a giant shade in the L1 Lagr …

A shellworld[1][2][3] is any of several types of hypothetical megastructures: The fourth type listed is: Completely hollow shell worlds can also be created on a planetary or larger scale by contain …

Short Answer: The K type star should probably be more than 10 times farther away from the F type star and the planet than in the question. Long answer: According to my calculations, a star with a lumi …

At first thought, the absolute maximum apparent diamater of a companion world in the sky of a habitable world would have to be 180 degrees since if any portion of it appeared to extend more than 90 de …

Actually you could use more than 3 smaller stars in the shared outer orbit. If you go to the PlanetPlanet blog, section on designing the Ultimate Solar System (one with the most habitable planets) and …

writers interested in learning about the conditions necessary for habitable planets should read Habitable Planets for Man, Stephen H. Dole, 1964, 2007. Otherwise they will risk being over fifty years …

I can think of ways the impact could be visible from Earth. 1 Possibly the impact would create a cloud of dust particles and vaporized rock that would expand to several times the diameter of the moon …