# 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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### Is "the earth moves around the sun" a case of Occam's razor?

This question is a bit more meta and non-straight forward than it might appear on first glance. I recently saw Why The Speed Of Light Is Unmeasurable, which is actually about why the speed of light ...
501 views

### What is the difference between Saddle points and Lagrangian points between Earth and the Sun?

I am studying MOND bubble effects in the Solar System (Paper). In "mond habitats.." (last reference) first page, the author says MOND bubbles reside on the saddle points but I fail to understand the ...
47 views

### Why Earth is viewed crescent from moon when the Earth is experiencing total solar eclipse?

Suppose a person, let's say Neil, is on moon and Earth is experiencing a total solar eclipse so how should Neil perceive the Earth? This is also a question from KVPY (5/11/2017) question no. 22. as ...
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### I am a bit stuck with the patched conic approximation for interplanetary travel between the Earth and Mars

I am writing an internal assessment for first year university on patched conic approximation. I am having some trouble calculating the departure angle from earth. This is because I have to calculate ...
1k views

### How long did the first rainshowers on Earth last?

When I was a child, I read many times over with fascination about the formation of the Earth in a large illustrated encyclopedia of sorts for adults (one of at least two volumes, though I will ...
3k views

### Energy flux formula

I think that the energy flux is given by: $$\text{G}=\mathcal{k}\cdot\text{T}^4\cdot\left(\frac{\text{R}}{\text{D}}\right)^2\tag1$$ Where $\mathcal{k}$ is the Boltzmann constant, $\text{T}$ is the ...
70 views

### What is Earth's linear velocity around the Sun?

I am creating a theoretical model of the Earth's tangential acceleration around the Sun (on an elliptical orbit, not circular). First, I will build a theoretical model, which is not influenced by any ...
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### There are similarities between Jupiter and Earth in terms of magnetic field, van allen belts. what does these findings indicate?

I want to know the importance about conducting research on jupiter. how it will impact our current understanding of solar sytem
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### How does the Sun's gravity affect the shape of the orbit of the Moon around the Earth?

If we look at the Earth-Moon system as a two-body Keplerian system, we would expect Earth and the Moon to orbit their center of mass (barycenter) in perfect ellipses, with the barycenter at one of the ...
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### Where I can find obliquity direction?

I can find axial tilt of planets easily, but that doesn't specify the direction of that tilt, i.e. planet's rotation axis may be anywhere in circle defined on a sphere by axial tilt value. And I can't ...
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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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### Combining Newtonian Gravity and length contraction from SRT?

The value of $\gamma$ that I will use is $$\gamma=\sqrt{1-\frac{v^2}{c^2}}$$ And length contraction is $$L_0=\frac{L}{\gamma}$$ Where all variables have usual meaning. Let the gravitational pull on ...
104 views

### 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 ...
112 views

### 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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### Why isn't the time between apogee and perigee constant?

I've assumed since the translational speed of the moon along its orbit undergoes the same boosts and reductions over its orbital course, the time between the apogee and the pedigee (and respectively, ...
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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 ...
248 views

### How does Planet 9's perihelion and aphelion affect the Kuiper belt objects?

Assuming that the existence of Planet 9 is confirmed and it really exists, how does it affect the orbits of the Kuiper belt objects? My understanding is that the discovery came in part from the ...
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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 ...
33 views

### 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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### Is the radiation on IO's surface directional?

I know that magnetospheres redirect solar radiation into the poles of a planet, but since IO is in Jupiter's magnetosphere does that mean that solar radiation is redirected across the planets surface ...
34 views

### Why the solar term gaps differ up to 1 day?

Solar term is any of twenty-four periods in traditional Chinese lunisolar calendars that matches a particular astronomical event or signifies some natural phenomenon. The points are spaced 15° apart ...
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### Proving nearby planets are not antimatter [duplicate]

Observations of the universe make us think matter is much more common than antimatter, and I believe no "probably-antimatter planets" have been found. But, if Pluto, for example, somehow ...
151 views

### Is it possible to estimate the 23.5° tilt of Earth's axis?

Using the value of the precession of Earth's axis in 25,800 years and the value of Earth's radius, mass, moment of inertia etc., would it be possible to calculate/estimate that Earth's axis must be ...
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### State of the art on relativistic perihelia precession in Solar System (other than Mercury)

The correct prediction of anomalous precession rate of Mercury perihelion is a classical test of General Relativity and one of its' big triumphs. How about other planets in the Solar System? ...
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### If motion is relative, can we say that the Earth doesn't revolve around the Sun? [duplicate]

Considering motion to be relative, consider these two cases as follows An observer is standing on the sun and observing the earth and the earth has no background (no stars and stuff in the background)...
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### If the Earth is constantly accelerating at 9.8m/s^2, according to General Relativity, won't Earth's speed be constantly increasing towards infinity? [duplicate]

As per Einstein's Theory of General Relativity, I understand that 'the Earth's ground is accelerating towards us at 9.8m/s^2. This is why we're falling towards the center of the Earth, as GR doesn't ...
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### Distance increase between Sun and Venus [closed]

Is the distance between the Sun and Venus increasing? What is the measurement? May I request for a formula?
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### In a 2-dimensional sense, how do the perihelions of the planets in our solar system line up?

A bit of background, I'm currently making a 2d graphical representation of the planets orbits around the sun with Python for a university project which currently looks like the picture below (not ...
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### Does the Oort cloud act as a kind of shield for the Solar System?

Does the Oort cloud act as a kind of shield for the Solar System? When an interstellar object impacts the cloud, does its momentum get absorbed substantially?
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### Is our solar system really that odd?

I have been learning about the solar system from popular science shows. In these shows they suggest that, after having seeing around 2500 other solar systems, astronomers have concluded that our ...
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### After the discovery of the "unicorn" black hole, how likely is the Earth to be hit by a blackhole?

We know that the earth's chances to be hit by a blackhole before the death of the sun were practically 0 but how do the odds change after the discovery of the unicorn? About the unicorn: https://www....
135 views

### How can the mass of the sun be determined without using Kepler's law or gravitational lensing?

Can the mass of the sun be determined using the abundance of elements or alternative methods? It would be better to ask the question like this if we assume that I have an object that contains baryonic ...
9k views

### What is the relationship between mass, speed and distance of a planet orbiting the sun?

After reading this fascinating story about a new exoplanet, I was wondering about how mass, speed and distance determine a circular orbit of a planet around a star. Given the mass of the sun and star,...
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### Is it possible for the Oort cloud to account for the Dark Matter issue?

I'm no cosmotolicist, so forgive me if I'm completely off the mark here. I'm just a curious observer. A few years back, I read that there is not enough matter in the universe to account for the ...
1k views

### Velocity of Solar System relative to CMB

In the book 'An introduction to science of cosmology' by Raine and Thomas, they have two equations $$\frac{\Delta T}{T} = \frac{v}{c}\cos\theta'\qquad (4.14)$$  T = (3.372±0.014)×10^{-3}\cos\theta'...
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### New orbit of Jupiter after the death of the Sun

When our sun finally ceases to exist as a red giant, 7 billion years from now, the outer layer of the star will get blown off in huge clouds of gas and dust known as planetary nebulae, leaving behind ...
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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,...
2k views

### Why did the ancients fail to discover that the Earth orbits the Sun? [closed]

The ancients observed that the Sun and the 'fixed' stars rotated about the Earth. They were also aware that the Earth was spherical. They performed many astronomical measurements on the planets - ...
8k views

### What angle does our Solar System make with The Milky Way?

Solar System resides in a plane, thanks to Conservation of Angular Momentum. The Milky Way is also a disc, not sphere. What angle does our Solar System's plane (or, normal to plane) make with The ...
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### Gravitation in solar system [closed]

What would happen to Earth’s motion if the Sun’ gravity was magically turned off? Assume that there are no other objects around.
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### Where can I find the true anomaly of the planets on Jan 1st 2000?

I am trying to code a simulation of the solar system. At present, all the orbits seem correct but I'm placing the planets at their respective periapses at the start of the simulation so the relative ...
7k views

### What is the electric charge of the Sun and its corona?

What is the net electric charge (in magnitude and sign) of the Sun and its corona?
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### How far has Earth moved from its birth orbit?

It says earth is almost as old as 1/3 of the universe's age which would mean 4.5 billion years . So how far has earth moved towards or away from the sun in these 4.5 billion years? Now perfect ...
9k views

### Angular speed of the planets

Do all the planets in our solar system have the same angular speed? Physics teacher says yes, my research is not crystal clear. I want to make sure I have the right information for future reference.
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### Is there more than one Solar System?

Please confirm: there is only one Solar System. Since 'Solar' is an adjective derived from the noun 'Sol' and as there is only one star named Sol, there is only one Solar System. To call the system ...
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### How can I estimate local solar time from direct solar radiation, knowing only latitude and longitude?

If I know the location (latitude and longitude) of a panel that measures solar radiation (in $\mathrm{W/m^2}$) and that it is at $0$ degrees to the horizon (i.e. facing skyward), can I estimate the ...
I was reading through the Wiki pages on tests of relativity and I was curious about this section. Am I interpreting it correctly? Is there still about $1.21''/\text{ cy}$ of precession (Total ...