Questions tagged [astronomy]
For questions related to planets, moons, stars and other celestial objects, and their motion on the sky.
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Size of parent planet in the sky from a tidally locked moon [duplicate]
TLDR: Can anyone explain to me (like I am five and very bad at math, the latter of which I actually am) how to determine the size of the parent gas giant in the sky of my moon?
EDIT: I am asking for ...
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Implications of Venus and Mars having the same mass as Earth
Could anyone advise if there have been any simulations on the long term stability of our solar system if Venus and Mars both had the same mass as Earth ?
If not, is this something that can be answered ...
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How do I make a Lunar Calendar for a planet with three moons and two suns on either side? [closed]
The planet is about three to five times the size of Earth and it shares a solar system with 13 other planets and they have an ∞ shaped orbit around two suns on opposite sides of the solar system. The ...
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How long would a day/week/month be in a world where a year was the equivalent to four months here? [closed]
I am new here and I wish for someone to help me with this question that haunts me with writer's block. I am writing a story that is set in a world where each year lasts the same time as four months ...
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Can a terrestial planet have a core of metallic hydrogen?
Let's say somehow, a yellow dwarf like our sun was sent hurtling through space, and smacked into a red giant with enough force to cause the two to go supernova.
With the release of large amounts of ...
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What's the maximum mass for an Iron Planet to have a magnetosphere like Mercury's?
I'm designing an iron planet which migrated into its habitable zone. Basic research told me iron planets cool off too quickly to have a magnetic field, so initially I was looking for ways native life ...
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Effect of molecular clouds on space travel and civilization
To What Extent are Molecular Clouds Geographic Barriers in Space?
In a sci-fi universe I've been working on for quite a while, I have different civilizations that are initially unaware of each other's ...
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How visible would stars be from a planet orbiting an M-class star?
I have a planet orbiting at 0.2067 AU around a M-class red dwarf of mass and luminosity 0.4037 Msol and 0.0286 Lsol, respectively. The planet has an atmosphere of 93% CO2 and 3 atm. What I wonder is, ...
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Solar Flux required to boil oceans?
What amount of stellar flux that a planet receives is required to boil away all oceans on said planet? We're thinking of Q🜨 (Earth = 1.00 Q🜨). For comparison: Venus ~ 1.93 Q🜨, Mercury ~ 6.57 Q🜨, ...
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How axial precession affects the night sky
I am working on the model which can visualise how the night sky change over time (from observer's point of view). I was thinking how axial precession affect positions of stars and planets on the night ...
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What Stars Do I Need to Make a Railgun?
Alright so I have come up with this idea for the primary weapon of a particular class of mages in my fantasy world: the Railgun. These mages are called starborn because, when they are born, they are ...
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If Earth were located at 1.1 AU from the Sun, would this affect the two zenithal passage days in the Tropics?
I am designing calendrics for an Earth-like planet located 1.1 AU from a Sun-like star. On Earth, on April 30th and August 13th, the Sun appears to pass directly overhead between the Tropics of Cancer ...
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Would an increase in star density affect the "Goldilocks Zone"?
Let's say that there's a solar system that matches the description of Sol exactly, save for the fact that it's 20,000 light years closer/farther to the galactic center.
Would the zone of one ...
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Could a captured planet end up in the habitable zone of a new star system?
Is it possible for a planet to be ejected from one star system and end up in the habitable zone of another? Or do captured planets always end up in wide, eccentric orbits?
I guess in the vast expanse ...
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How might planet size affect volcanic activity?
I'm working on a project involving the evolution of life on different hypothetical habitable planets. In imagining different atmospheres on planets of different masses, I'm wondering how a planet's ...
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