# 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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### How do we know when the earth completes an orbit?

Two bodies in space always orbit their center of mass. So the relative motion of the Sun and the Earth happen in the same line, save for the rotation of the Sun. So, how do we measure The time taken ...
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### How much of the current Solar System's properties is determined by the initial macroscopic state?

Quoting Wikipedia: The nebular hypothesis says that the Solar System formed from the gravitational collapse of a fragment of a giant molecular cloud. The question is: how much of the current form of ...
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### How much energy is required to remove Earth from it's orbit and exit the solar system under perfect conditions?

Ok, this is my first question on this site. But it's one I've been thinking about for a while. Say through whatever means, we place a device capable of generating thrust/ kinetic energy on the surface ...
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### What is the Metric of the Gravitational Field of the Sun?

What metric determines the "geometry" of the gravitational field generated by the mass of the sun? Is there a general metric that incorporates arbitrary mass and devolves into the ...
410 views

### Escape velocity when Sun is present

When we calculate escape velocity for an object from earth, what we do is, we conserve energy. So if $v$ is the escape velocity, we write $$-\frac{GM_em}{R_e}+\frac{1}{2}mv^2=0$$ since we are assuming ...
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### If another planet was opposite Earth, would we be able to observe it?

Imagine another Earth-sized planet, in the exact same orbit as Earth, but 180 degrees out-of-phase. In this arrangement, at all times, you would be able to draw a single straight line through space ...
112 views

### Why do the planets tend to spin in the same direction as they orbit the center sun?

I mean, why do the spin angular momentum and the orbit angular momentum of a planet tend to have the same direction? As we all know, a planetesimal $m$ orbiting a sun with mass $M_{sun}$ at $r$ will ...
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### Can time in space be years faster than on Earth? [closed]

Is it possible that in some distant solar system from another galaxy, time will be dramatically different from our Earth time, with years passing far faster than on Earth time?
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### Why does the Earth move away from the Sun?

From the (Wikipedia's) definition of the astronomical unit $AU$, we have that it is defined as: $AU=\sqrt{\dfrac{GMD^2}{k^2}}$ Where $k\approx0.01720209895$ is Gauss' gravitational constant, $G$ is ...
3k views

### Does the Earth experience air resistance?

Consider the earth body excluding the atmosphere, undergoing circular motion around the sun. Does it experience air resistance due to the atmosphere?
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### Does the angular velocity of the sun around its axis affect gravity?

Lets say I am in a circular orbit around the sun. From the suns perspective, Im 'rolling' circles in its gravitational well. But from my perspective I'm just being stationary. Spacetime is flat for me ...
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### When the new moon will become visible - after how many hours of conjunction

The moon will be totally invisible during Conjunction of moon, sun and earth. After how many hours of conjunction, moon will be visible from earth.
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### Falsifiability of a hypothesis related to a gravitational geon at the edge of Solar System that I postulate [closed]

This post is a version of a post with identificator Meta PSE 12909 that I've asked in recent past years on Meta Physics Stack Exchange Asking if the following post could be suitable for the main site ...
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### Paper about solar wind model

I am searching for a paper about the solar wind. In particular, I need a model (or real data) that describes plasma density as a function of time and location in space. Do such data exist in the ...
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### How to calculate Earth's speed due to moon induced orbit? [closed]

In https://stackoverflow.com/q/75297814/ the answer for the problem was that the earth like the moon had a speed due to the moon induced orbit. I don't understand how this was calculated? I have ...
229 views

### Does the Sun or Moon affect weight measurements on Earth?

The gravitational acceleration due to the Earth at its surface, $g_E$, is $$g_E = 9.8\hbox{ m/s{^2}}.$$ The gravitational acceleration due to the Sun at the Earth's position is g_S = 5.9 \times 10^...
1 vote
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### How to calculate the distance of Mercury's perihelion shift in meters? [closed]

Since the shift in mercury's perihelion shift is 2.88E-5 degrees and mercury's altitude above the Sun at its perihelion is 46001200000 meters, can I use the formula for an isosceles triangle to ...
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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: ...
1k views

### 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 ... 5k views

### 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. ...
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 ...
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 ...
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### 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 ...
61 views

### 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 ...
121 views

### 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 ...