# 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.

698 questions
Filter by
Sorted by
Tagged with
55 views

### Relation between Earth's and Sun's magnetic axis relative to their paths of travel and relative to each other?

Pretext As non-educated citizen with no academic background, and based on watched PBS Space Time's latest video I've got curious, what's the relation between Earth's and Sun's magnetic axis relative ...
• 530
44 views

### The magnetic force between the earth and the sun

There is a magnetic field around the earth and a stronger one around the sun. I guess there should be a magnetic force between the sun and earth. Now, shouldn't we take the magnetic force into account ...
85 views

### Questions about speed of gravity [duplicate]

If gravity "travels" at $c$, and the sun is travelling "forward", does it mean the planets are actually orbiting various points "behind" the center of the sun? Does it ...
1 vote
19 views

### Is there ways to find the most efficient geometrical structure for sunlight concentration? [closed]

we are researching for the most efficient geometrical structure of a concentrator. What we mean by 'most efficient' is that we are trying to get the most sunlight while sun is up. We are not trying to ...
• 11
52 views

### Why sun revolve around the sun ? Why cant it just rotate ? ( gravitas attraction force makes it revolve , how?) [closed]

Why the revolution ? How General relativity theory explains it
1 vote
53 views

### How do solar cells really work?

When I read articles on the workings of photovoltaics, the explanation tends to revolve around the idea of PN-junctions, and how an electric field separates charges (electrons and holes). In a Quora ...
• 25
124 views

### How do we interpret measurements of Mercury's position?

When scientists measured the position of Mercury in the 18th century, they interpreted the results assuming a Euclidean background, because they did not know general relativity. So they measured $r$ ...
• 61
65 views

### How symmetric do we know the gravitation field to be?

Currently, the only ways to measure gravity is on quite large scale. So these experiments measure gravity averaged between vast systems of particles. Of course, such an averaging results¹⁾ in a ...
1 vote
69 views

### Tidal forces in the early solar system

I'm reading a book called "Gravity from the ground up" by Bernard Schutz. I don't understand this section from Investigation 13.3 on page 159, which discusses the formation of the solar ...
2k views

### Proving Kepler's second law of planetary motion using conservation of angular momentum: What about gravity from other planets?

I'm reading An Introduction to Mechanics by Kleppner and Kolenkow. In the chapter on angular momentum, a (beautiful!) example is given by discussing Kepler's second law of planetary motion. The law ...
• 605
1 vote
100 views

### Escape Velocity from Moon to escape Earth-Moon System

So the escape velocity at Earth is roughly 11.2 km/s, but with the escape velocity of the moon it says that it is 2.38 km/s but since the moon is orbiting the Earth, wouldn't the effective escape ...
• 1,534
49 views

### Why does a total solar eclipse happen every 18 Months?

What is the math involved in calculating how often a total solar eclipse happens. Can you predict it by just looking at the period of the moon around the earth and the period of the earth around the ...
78 views

### What happened to Newton 3rd law if our Moon is moving away at 1.5" yearly? [closed]

Our Moon is going away and I read that it is the culprit is our ocean, but then what happens to Newton 3rd law there should be an equal and opposite forces too so where's that? Is it absorbed by the ...
• 13k
2k views

### Mars' orbital period

The orbital period of Mars, is, as anyone can find at Wikipedia, $T=686.98$ d, and the semi-major axis of its orbit is $a=2.2794\cdot10^{11}$ m. This gives $T=2\pi\sqrt{\dfrac{a^3}{GM}}=686.84\text{d}$...
• 211
1 vote
16 views

### Parabolic collector and Angle of incidence

Would a static non movable parabolic solar collector always focus the light hitting such collector to the same position of its focus?.. Or it's focal position would vary depending on where the sun is ...
74 views

### How do rubble pile asteroids form?

This Dr. Becky video describes the early history of the solar system. Why the Earth exists because of Saturn | Migration of Planets. In it she talks about how a cloud of nanometer to centimeter sized ...
• 41.1k
32 views

### Inquiry Regarding Hypothetical Celestial Mechanics Scenario

How would the addition of a second sun, located at the other focus of the planet's elliptical orbit, impact the motion and orbit of the planet? Specifically, how would the gravitational forces from ...
1 vote
153 views

### Is a satellite revolving in Earth's orbit also affected by the gravity of the Sun or other planets?

The Earth revolves around the Sun and a satellite also revolves around the Earth. The Sun has a gravitational effect on all celestial bodies, so does it also have an effect on the satellite? If so ...
56 views

### Kepler's Third Law versus PBS Newshour "Planets Orbiting in Sync"

See the PBS Newshour story from 04Dec2023...   "Solar system with 6 planets orbiting in-sync discovered in Milky Way"   https://www.youtube.com/watch?v=ZUTPoINTqYM ...About 30seconds into ...
• 119
505 views

### Are there torques affecting Earth?

Since the time it takes for the earth to complete one rotation about itself (i.e., the time we call "day") is not constant, then the angular speed is also not constant, that is, there is a ...
• 135
1 vote
91 views

### Dimensionless value to differentiate between concretated and dispersed mass systems

I want to find a dimensionless value that differentiates between concentrated mass systems such as the solar system and dispersed mass systems such as a galaxy. The only value I can think of is the ...
• 476
1 vote
34 views

### Orbital obliquity of the Earth

Consider that we have all the orbital parameters that characterize the Earth. How would one calculate the orbital obliquity of Earth? One could argue that since the rotation of Earth doesn't change ...
• 1,213
120 views

### Can gravity of planets besides Sun and Moon affect tides on Earth?

The tides in some places on Earth are over 50 feet. If the gravity from Venus had a ten thousandth the affect of the Sun and Moon on a 50 foot tide it would make a difference of one twentieth of an ...
• 481
231 views

### Are gravitons radiated while the massive body turned making Earth orbit unstable?

When @anna v explained why the planetary model of the atom does not make sense in this post, she said the electron in an orbit is accelerating continuously and would thus radiate away its energy and ...
• 33
308 views

### 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 ...
42 views

### 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 ...
• 3,369
380 views

### 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 ...
1k views

### 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 ...
562 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 ...
• 361
4k views

### 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 ...
183 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 ...
• 309
92 views

### 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?
95 views

### 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: $AU=\sqrt[3]{\dfrac{GMD^2}{k^2}}$ Where $k\approx0.01720209895$ is Gauss' gravitational constant, $G$ is ...
• 495
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?
• 303
59 views

### 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 ...
68 views

### 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.
334 views

### 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 ...
29 views

### 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 ...
• 1
82 views

### 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 ...
527 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^...
• 5,925
1 vote
52 views

### 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 ...
• 335
43 views

786 views

### Calculating mass of object by its orbit

Can you calculate the mass of an object by its own orbit around another object? I found many ways to calculate the mass of an object by measuring the trajectories of other objects orbiting it, but ...
• 141
1 vote
61 views

### High school thesis project about Jupiter's moon Europa [closed]

So basically, I have to write a thesis paper because I'm in the last year of high school. It is an independent research project and the culminating work of my studies in school, so it represents my ...
• 71
1 vote
51 views

### How do the atoms and electrons move around space when the solar core presses them into a dense plasma? [closed]

It takes a lot of intelligence to compute the center of the sun. As far as I imagine, it's compressed by the hand of gravity and high energy fusion radiation wants to escape one way or the other. ...
• 1,469