Monday, February 23, 2015

astrophysics - Help figure out the planet M




let's imagine there is a planet named M. it has 2 or 3 moons and one of them is as big as a moon can be. the moon is in lag range 1 and it blocks the light of the star for at least half of the year making the whole planet night time. the planet itself takes 1000 days to orbit its star. and days and nights are very long.


these are the concerns:


1: how big and how close/far should this big moon be for the situation above to work?


2: how big can the planet be in order for humans to live normal lives.


3: will vibrant life be possible on such a planet?


4: if the light is blocked by the moon, won't it freeze the planet?


5: how can I have very very long night but still have good temperatures?


6: if the question number 4 is correct, can I use the moons to duplicate the effect on IO and produce volcanos to warm things?


7: if the planet is tidally locked with its biggest moon, will there be ALWAYS darkness or will there be also day time?



The main question of this article is: How can I make such a planet function and have life forms and plants like earth?


p.s: I could even change the star, this whole system is imaginary.


and i CANT seperate these because then i would have to copy and paste ALL the details of the imaginary planet and its orbit and its moons over and over again. wouldnt that be worse ?



Answer



1: Mass of the planet and mass of the star determines the distance and then it's just a geometry problem, draw a triangle between the star and the moon and a point on the planet, think about eclipses.


2: I think this one is about gravity, to big and they wont be able to move around.


3: Not probable. A 1000 day orbit means that it's about 3 times further from its star than we are from ours, so depending on the temperature of the star it's likely out of the habitable zone.


4: Shadows for half the year will definitely cool things down.


5: Possibly a massive green house effect?


6: you have multiple moons so probably can squeeze things, but wouldn't it squeeze the small moons harder? At this point i'd be hooping for an endor moon.



7: I dont' think the rotation of the planet is relevant, if the moon is stuck in L1 and big enough to eclipse the planet there will be darkness year round no matter how it spins


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