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There is a book about the possibility of human habitable exo planets around other stars. Habitable Planets for Man, Stephen H. Dole, 1964. https://www.rand.org/content/dam/rand/pubs/commercial_books/2 …

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 …

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 …

I don't know why Fabius Maximus thinks that tidal forces would be too strong in a double planet or a a habitable moon of a gas giant planet. Part One of two: Two habitable planets orbiting the same …

According to this online escape velocity calculator, https://www.calctool.org/astrophysics/escape-velocity the planet's escape velocity would be 23.73 kilometers per second. …

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 …

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 …

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 …

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 …

In binary star systems, planets can either orbit one of the stars in a S-type or noncircumbinar orbit, or orbit both of the stars in a P-type or circumbinary orbit. https://en.wikipedia.org/wiki/Habit …

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 …

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 …

I'm interested in the Physics around increasing the gravity of Mars to make it habitable. I was unsure how to work out what gravity would be needed to retain an atmosphere thick enough to hold liquid …

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 …