# 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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### Can we compute\simulate why the solar system has a very small number of planets?

I saw a YouTube video saying that Earth was formed in the solar system which was initially a rotating disk of dust that kept colliding and forming larger and larger blocks. What surprises me is that: ...
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### Do solar flares move the dust on the surface of the Moon?

The TV show For All Mankind has a reputation for scientific accuracy, so I think it's fair game to ask if it lives up to this reputation. In this video clip, we see the dust on the surface of the Moon ...
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### Why most of the things in this universe wants to become Sphere? [duplicate]

in our solar system , every planets revolve in elliptical path and their shapes is almost oval or approaches to Sphere . Sun is also looks like Sphere . Question: Why everything trying to approaches ...
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### Is an Aldrin Cycler which encounters three or four bodies possible?

Is it possible for an Aldrin Cycler to work multi-moon system like the Jovian system, encountering at least three bodies?
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### How could Tycho Brahe determine positions without accurate clocks?

Tycho Brahe determined the positions of stars and planets to an accuracy of 2 minutes of angle. Pendulum clocks hadn't been invented yet so he couldn't have known the time to better than 15 minutes. ...
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1 vote
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### Does the Lagrange Point $L_3$ exist in practice in the multi-body solar system?

Lagrange Points ($L_1$ through $L_5$) in a restricted 3-body system are well documented. Traditionally body 1 (M1) is the central object with a mass much greater than the other two objects. M2 is ...
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1 vote
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### Does the Milky Way have any impact on Earth?

Does which galaxy we are in (Milky Way) have any impact on Sun/Earth? What I mean is: suppose our solar system was instantly teleported into a different galaxy (eg Andromeda). Apart from the stars ...
61 views

### The unlikely marriage of orbiting bodies

O.k. so we have an orbiting body such as the Earth around the sun or the moon around the Earth. The fact that they are orbiting does not fascinate me, it is my intuitive sense that there is a much ...
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### Could a 100 solar mass black hole at 0.01c passing just at 123 AU change the direction the sun is moving by 90°?

I asked the person claiming to have created this video of such an encounter why this simulation suggests that the sun is moving in a direction that is parallel to the plane of the ecliptic? I'd ...
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### Why is the shape of the orbit of the Earth as it is?

My View: I think that if the sun were only force acting on earth (as a centripetal force), the earth would have a circular orbit. Since other planets also exist , there also exists gravitational force ...
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### Why do moons not get pulled into the planet while they clear their neighborhood? [duplicate]

Today, my 6 year old and I were discussing dwarf planets and their characteristics. We were talking about how, to be a considered a planet, the planet needs to clear it's neighborhood (as explained in ...
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1 vote
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### Is the solar system sitting in the centre of curved spacetime and if so, are we viewing the rest of the universe from inside that "bubble"?

I read an article about a huge bubble being discovered in which the solar system sits bang in the middle. It got me thinking about the curvature of spacetime. The bubble was created by several ...
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### Are there tidal forces between the solar system and the galactic centre?

Tidal forces are experienced within a system moving in free fall around a bigger object because of the different strength of gravity over the system. The difference can be calculated between the far ...
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### Why does Jupiter have so many moons?

The usual explanations one finds just say that Jupiter has a strong gravitational field, thereby being able to catch moons easier, and then they stop there. But this seems far from a satisfactory ...
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### Kepler's laws of motion [duplicate]

I have studied Kepler's Law of Motion but I always think how did Kepler arrive to those laws and what were the basic thinking behind it? I just want to know the basic physics behind his ideas. I know ...
1 vote
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### Earth's rotation axis orientation in space in relation to vernal equinox point

Lately I got confused about how the Earth's rotational axis is oriented during the vernal equinox, as I got information that Earth has an equator ascending node equal to about 11°. If, this day, we ...
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### Drawing night sky of planets other than Earth (invariable plane ambiguity)

I'm writing an application that draws maps of night sky that can be visible from other planets (ultimately they are to be exoplanets). Mostly I do it out of curiosity :). I's thinking a lot where I ...
• 137
1 vote
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### How close can Jupiter be to Earth without making Earth unhabitable? [closed]

How close can Jupiter be to Earth without making Earth unhabitable? What's the closest distance possible? Can Jupiter be twice or three or four times as close to Earth as Mars without having any ...
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### How do I calculate evection and variation for the moon in my simple solar system model?

I am building a model of a simple sun-planet-moon solar system (not the real Sol-Terra-Luna system). Purpose: to calculate the positions of the sun and moon in the sky of the planet at a given time, ...
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### When Sun was forming and before nuclear reactions inside the core what should have been its surface temperature?

When the Sun was forming and before all the nuclear reactions started inside its core, what should have been its surface temperature (only due to gas friction)?
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1 vote
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### Have I accounted for all relevant physics in my simplified three-body solar system model? [closed]

EDIT: Re-framed here to be more on-topic. I am building a model of a simplified, fictional sun-planet-moon solar system (not the real Sun-Earth-Luna system) to calculate astronomical events like ...
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### Conservation of momenta in the solar system

I am writing a python program to simulate the universe and I had a question regarding conservation laws. As rightly stated in these answers, "Both are conserved if you consider the whole system ....
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1 vote
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### What causes Saturn's hexagon hurricane? [duplicate]

Recently, Tien Nguyen JPL Fellow - Chief Engineer at NASA Jet Propulsion Laboratory, did share this photo that says "Cassini catches an awesome glimpse of Saturn’s north pole hurricane" I ...
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### How do I calculate Earth's axial precession in an idealized Sun-Earth system?

I am experimenting with an idealized two-body system based on the Sun-Earth system. I want to calculate how much Earth's axis precesses and nutates given the simplified setup. In my system, the orbit ...
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### Winds on gas giant planets: Would they increase if closer to their star?

The planets Saturn, Uranus, and Neptune are all primarily heated by their internal radiated heat, not by the Sun. Each of them have rotational periods shorter than that of Earth despite their much ...
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1 vote
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### Effect of the Sun on the motion of bodies on the Earth

Does a body at the surface of the Earth fall at a slower rate when the Sun is at its zenith (that is when the side of the Earth that the body is on is turned towards the Sun and the body is directly ...
4k views

### If gravity is attractive, why doesn't the Milky Way contract?

Einstein introduced the cosmological constant because without it, one cannot get a static universe - gravity would cause the universe to contract. Given that, why is the Milky Way not contracting? For ...
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