Questions tagged [solar-system]

The Sun plus the collection of bodies in orbit around the Sun such as planets, dwarf planets, moons, asteroids, comets, etc.

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2answers
130 views

Why does this simple equation predict the Venus surface temperature so accurately?

Assume the atmosphere of Venus behaves much the same as Earth. However, it is closer to the sun, has a thicker atmosphere, and is less massive. Further assume: The insolation should follow the ...
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55 views

Can dark matter explain the unusual orbit of transnettunian objects? [on hold]

While we are struggling to find an hypothetical planet 9 to explain the unusual orbit of transnettunian objects, I was wondering if it could be just dark matter. We know that the universe is mostly ...
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Is space-time fabric around Uranus tilted?

I am completely new in this field, so please pardon me if I am asking something which makes no sense at all :) The Situation: According to Einstein's theory of relativity, there is a 4th dimension ...
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Can we deorbit space trash into the sun by splitting it in two?

So there's an issue of deorbiting stuff because if you just deorbit it a little, it'll enter a more elliptical orbit but still hit you in the back when you return to this place a year later. Size and ...
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29 views

What is the total mass of orbiting interplanetary unbound atoms in the solar system?

Excuse the poor phrasing of the title, but it became apparent to me that the solar system has some degree of density (i.e it is not a perfect vacuum). So my question is if any of these particles (not ...
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Why does earth not follow the same rule around sun as moon follows around earth?

As you all know that only one side of the moon faces earth through the whole of its journey. The reason why it happens can be owed to the fact that the center of gravity of the moon (because of ...
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About Mercury perihelion again

Sorry to bother you, but I did not get anywhere answer what exactly moves Mercury periapsis. "Sun gravity" or "GR" or "warp of spacetime" are very broad answers, I want to know how they affect this ...
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Angular Momentum — AP Physics C

Do all of the planets in our solar system have the same angular momentum? If so, why? I'm not sure if the following is correct: If we could drag a planet radially outward from the sun, then no ...
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4answers
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If our solar system was filled with air instead of the vacuum, would earth be colder or hotter?

Would the heat from the sun be transferred better to earth, since air is an isolator inferior to vacuum thus producing a hotter environment? Or would the energy be absorbed and dissipated in the air,...
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61 views

How do we know the Moon has a 0.50 angular degree from us?

Before we knew the distance to the moon, how can you get the exact angular degree of it without knowing the distance to it? Obviously you can just guess or assume but how was it first calculated?
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Recent/More accurate rotation velocity measurement?

I've been researching for papers for hours and can't seem to find this. Where can I find the most accurate equatorial rotational velocity measurement for Mars?
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1answer
52 views

Do all the planets in our solar system orbit the sun in the same direction and in the same plane?

Do all the planets in our solar system orbit the sun in the same direction and in the same plane? (as in a flat orbit if you are looking from "above")
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Ever looming shadow

If I'm not mistaken the reason the moon eclipses the sun is because the ratio of distance to size, in regards to the moon and sun, is 1:1. And is it not also true that the reason we only ever see one ...
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1answer
122 views

Shouldn't cosmic rays slow down Earth's movement around the Sun?

Maybe a dumb question. Are cosmic rays slowing down earth's (or any planets) movement around the sun? To me it sounds like an analogy of moving a mass through air and being slowed down by the impact ...
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72 views

Let's say that the Sun moves away from us, this should cause a change in gravitational force, when will this change be noticed by us?

I have studied Newtonian physics, and was having a introduction to relativistic physics. I read a similar question in 'A brief history of Time' which is now not letting me sleep.
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Confusion about a claim in the “Brief History of Time” by Hawking

In the first chapter, while talking about how Aristotle was able to conclude that the Earth is spherical, Hawking says that had the Earth been a flat disk the shadow of the on the Earth on the moon ...
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Why Earth’s crust is max 100 kms wheras Moon and Mars have much thicker ones?

We know that the Earth’ mantle and core are hot, whereas the crust has cooled down. The cooling process of the 4,5 billion years of the Earth’ exisence resulted a crust of between 50 and 100 kms. ...
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Uranus: The Spin

In his prog. , on the outer planets, Brian Cox stated that Uranus spins on its side because it once endured an interplanetary collision. Such a cataclysm would normally be devastating for both ...
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Is there a maximum distance from a planet that a moon can orbit?

Given a planet that orbits a star, and a moon that orbits that planet, is it possible to define a maximum orbital radius of that moon, beyond which the moon would no longer orbit the planet, but the ...
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Jupiter & Saturn

In his prog. on Jupiter, Brian Cox stated that the complex gravitational interplay, between Jupiter & Saturn, prevented Jupiter from drifting through the Asteroid Belt, and approaching our part of ...
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1answer
91 views

**Mathematical Derivation** of the fact that all planets will orbit on the same plane

There is some discussion about this Here. If an isolated system of particles under gravitational force is allowed to decrease its energy by means such as inelastic collision, then eventually all ...
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1answer
43 views

What units are represented by pr - micrometer?

In studying column abundances, I often encounter the units $pr-\mu m$. What does this stand for? Part per micrometer? how can this be an abundance unit? Incredibility I cannot figure out what it ...
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In what planetary system can we have arbitrarily long winters?

Unlike on Earth where the length of seasons are almost of the same duration each time, the hypothetical planet on which Game of Thrones took place has seasons of arbitrary length i.e. some winters ...
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Does the length of a solar cycle (11 Years) change for different planets?

I know that solar cycles (minimum/maximum) last for 11 years each, but is this in earth years, or is this time period consistent across every planet? For example, on Mars, would a solar cycle last ...
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The Earth revolves around the Sun or the Sun revolves around the Earth

Well, in today's world we know that the earth resolves around the sun. But that is seen from frame of reference of sun or an observer stationary wrt sun. From frame of reference of the earth, sun ...
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What are the forces behind the orbit of the Earth around the Sun?

Does the gravity of the sun alone affect the orbit of the earth around the sun? Look at the image below,(Image is not to scale), Is it that when earth is going from position 1 to position 2, it ...
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1answer
63 views

Was Titan once warmed by a hot Saturn, & therefore much more Earth-like than it is today?

Is it possible that 4 billion years ago, Saturn was sufficiently hot to act as a second sun to Titan, so that conditions on Titan were then similar to those on Earth?
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Why is the orbit of the Earth around the Sun very intricate?

The movement of the earth around the sun is very Goldilocky. Did it happen over the years as the orbit of earth averaged out into how it is now? Is there any chance of it (orbit) changing by itself in ...
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1answer
106 views

Anomalous precession of the orbit of Mercury

Can the anomalous precession of the orbit of Mercury be explained just with relativistic length contraction?
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1answer
42 views

Why does it takes so much time for photons to reach surface of sun from its core?

I have read somewhere that the time taken by photons to reach the surface of sun is very large as compared to time it takes to reach earth from the surface of sun . Is the presence of dense gases in ...
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How long would it take for Earth to become desolate after being slung from orbit?

I rather enjoy watching some of the what if scenarios on YouTube, and today I had one trigger my urge to seek out some knowledge on a curiosity I have. A lot of media out there explains that the ...
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25 views

Why does the Earth not fall towards the Sun? [duplicate]

According to http://wtamu.edu/~cbaird/sq/mobile/2013/07/01/why-doesnt-the-earth-fall-down/ , the earth does not fall down because of the gravitational force of the sun. At the same time , earth's ...
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help: calculating surface temp for rotating planet from solar constant 1366 w/m2

I'm interested in calculating the maximum surface temperature for a rotating planet from the solar constant. I can calculate the solar constant for a planet at any distance from the sun, no problem, ...
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How can a day be exactly 24 hours long? [closed]

The longest solar day of year is approximately 24 hours 0 min 30 seconds (occurs at mid to late December) while the shortest solar day of year is approximately 23 hour 59min 38 seconds. If I average ...
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3answers
104 views

Why is a gibbous moon possible?

This could be a silly question to ask, but I would like to know why is a gibbous moon shape possible. From the few cases I've drawn here, I could not think of a configuration where the Earth's shadow ...
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What is novel about the analysis showing that Mercury is “closer” to Earth than Venus?

Why is the recent analysis showing that Mercury and not Venus is on average the closest planet considered new? This should surely come as no surprise to anyone who has ever looked at a plot of the ...
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Is it possible to approximate the solar radiation output for each hour of the day with the total output in a day?

If you know the total irradiance received by the sun during a single day, could you approximate how many irradiance each hour you get if you assume it was a clear day? I am able to calculate the ...
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Orbit such that distance from Earth is always the same as distance from Mars

Would it be possible to place a satellite into an orbit such that its distance from Earth and Mars always remained the same? That is the distance between the satellite and Earth and the satellite and ...
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2answers
99 views

Why are the seasons reversed between the northern and southern hemispheres? [duplicate]

Why is it winter in the north when it's summer in the south, and vice versa? I know the standard answer to this question is "because of the Earth's axial tilt, at a point in the Earth's orbit where ...
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132 views

A confusion between geocentric and heliocentric model [duplicate]

As per Ptolemy, he proposed firstly geocentric model and that model if one see with aspects of relativity he would find true. Here is an example how Suppose you are in a train which is moving and you ...
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1answer
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'Harmony of the Spheres' or 'Harmony of the World' - is it debunked? [closed]

I sincerely apologise for this vague question but I'm writing an essay for my music class on musical harmony and it's historical origins. I came across the Pythagorean notion of Harmony of the Spheres ...
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5answers
107 views

What is holding things like the Earth and the Sun in one dimension?

I was thinking last night: for most of my life I’ve been taught that the planets in our solar system orbit the Sun, which insinuates that the Sun is in a fixed point in 3-dimensional space, and that ...
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1answer
36 views

The shape characteristics of gravitational wells given different masses and spread of objects

I am curious as to research that calculates the shape of gravitational wells, and their limits, and affect on time, for different masses and spread of mass. The actual question is st the end. For ...
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1answer
44 views

Solar System Position and Velocity data

I'm trying to create an nbody simulator and to test it I'd like some real world data. A good test would be the solar system. I've come across the JPL Horizons software but if cant seem to figure out ...
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Gravitational advantage of outer planets in war

The Expanse books cover a lot of aspects of war in a situation where humans inhabit many planets and moons of the solar system. The author makes the point that, in a war situation, the outer planets ...
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1answer
111 views

Why is ʻOumuamua traveling so slowly?

Imagine a space rock that starts at rest at the Lagrange point between the sun and our nearest stellar neighbor, Alpha Centauri. That would put it at about 2 light years away from the sun. Now, it ...
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3answers
126 views

Relativistic space rocks. Are they possible?

I was thinking that the Universe is full of extreme events. Colliding galaxies, exploding stars, colliding planets (like in one of models of our Moon formation), colliding black holes... Can it be ...
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70 views

Speed of solar system through dark matter halo

How is the speed of the solar system through the dark matter halo determined? Direct dark matter detection experiments rely on this speed estimate. Assuming the sun/earth travel through the dark ...
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28 views

Gravitational/electromagnetic effect of planets on solar activity?

Does the gravitational and/or electromagnetic influence of planets have any effect or correspondence to solar activities (e.g. solar flares/CMEs) - and if so, does the planetary position (where they ...
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1answer
49 views

Transit of Venus and the computation of the Atronomical Unit

I have searched for the computation of the AU. The two best websites I found about it were https://sunearthday.nasa.gov/2012/articles/ttt_75.php How did Halley calculate the distance to the Sun by ...