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.

Filter by
Sorted by
Tagged with
0
votes
1answer
33 views

Why does the rotation axis of the Earth wobble over time?

I've learned recently that the rotation axis of Earth (axial tilt or obliquity) oscillates between 22.1 and 24.5 degrees. I would like to understand why does that happen. Having a basic understanding ...
-2
votes
0answers
34 views

What is Mercury's perihelion distance around sun? [closed]

What's the average circumference distance, not altitude, that Mercury makes around the sun during its perihelion?
4
votes
2answers
87 views

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 ...
2
votes
3answers
57 views

Why is the universe so stable and consistent? [closed]

Why is it we can discover patterns? Like math, chemistry, physics, biology, etc. Why does the universe never fail us? For example in one second I'm standing next to you, the next I'm still standing ...
0
votes
0answers
29 views

Distance between Earth and Sun - Derivation of Equation

While reading a textbook about the solar position of the earth I came across an equation that can't find its derivation. j = d 2 pi / 365.2422 πœ€ β‰ˆ 0.03344 cos(j - 0.049) π‘Ÿ0/π‘Ÿ = √(1 + πœ€) I think it ...
2
votes
2answers
33 views

How much watts per square meter does Phobos receive from Mars?

Being so close to Mars, Phobos should receive a non-negligible amount of irradiance from Mars. Be it from reflected sunlight, Mars' emitted infrared radiation, or other factors. I have no idea how to ...
1
vote
3answers
21 views

Is the compass direction of a planet recorded by two different observers separated by some distance the same?

I have a basic doubt. Say I am viewing Mars from my window and I used the compass app to get an approximate 2D direction. If at the same instant another person also observes Mars from their window. ...
0
votes
3answers
365 views

Tilting of Earth rotational axis

In which way do the Earth's rotational axis tilted 23.5Β°. see in the image we have been told that the axis of rotation of Earth is tilted 23.5Β° from the perpendicular to path. But can anyone say in ...
1
vote
3answers
67 views

How well can we measure how fast are we spinning?

Although absolute translational motion is meaningless and unmeasurable (Michelson and Morley, etc), absolute rotational motion is meaningful (Newton's bucket) and measurable, using Foucault's pendulum....
0
votes
1answer
222 views

Definition of a planet [closed]

Why is Mercury considered a planet at 15329km in circumference when Callisto is not at 15144km? Pluto is 7232 km in circumference... If it was once a planet, why not Callisto?
0
votes
1answer
41 views

What are the sources of error in the formula I derived to estimate sunrise and sunset times, and how can I improve its accuracy? [closed]

I derived the following formula to estimate sunrise and sunset times: $$ t=\pm\cos^{-1}\frac{\sin\theta-\sin L_{loc}\sin L_{sun}}{\cos L_{loc}\cos L_{sun}} $$ $L_{loc}$ is the local latitude $L_{sun}$...
2
votes
0answers
26 views

Is Jupiter really protecting us from collisions with objects?

Many documentaries I see on the Solar System or the planets or the threat of collisions with meteorites talk about how lucky we are to have Jupiter, with its immense gravity attracting asteroids to it ...
0
votes
1answer
30 views

Are there any effect of Sun to the tide? [duplicate]

The Earth is rotating for the Sun's gravitational field. Like a free falling object Earth should feel zero gravity to the Sun. So why there are effect of Sun to the tide?
2
votes
1answer
64 views

Why is the predictability of the solar system in the Lyapunov timescale limited to 5 million years?

Is this due to a mathematical problem that is not solved? Or could this be due to our current amount of information regarding mass and other such factors in our system?
1
vote
1answer
60 views

Equations for developing a hypothetical Solar System

I am currently going down the rabbit hole of writing a story but I would like it to be set in a universe which is believable. Therefore I am trying to create a hypothetical solar system in which the ...
0
votes
2answers
31 views

Do we have to care about the force from the Milky Way black hole while analysing the Solar system from its Center of Mass frame?

And also while analysing Earth's spinning motion about its center? Do we have to care about the forces from the giant Black Hole at the center of Milky way? I guess we would have to take the Black ...
1
vote
1answer
153 views

Why does the Earth not spiral into the Sun if it is charged?

The Rutherford Model of the atom was similar to the solar system. The major drawback of the model was that it was not consistent with maxwell's theory of electromagnetism which stated that : All ...
1
vote
3answers
94 views

Why didn't heavier elements settle at the core of the solar system?

As the solar system formed, why didn't all of the heavier elements such as iron, collect where the sun is leaving the lighter elements in the outer solar system?
0
votes
1answer
21 views

Dark matter distribution and solar systems

If it's lack interaction keeps dark matter from behaving like matter and ending up distributed like matter. Then why did it gather at the galactic gravitational well in the first place and why end up ...
-1
votes
1answer
27 views

Interaction of the magnetic bubbles at the edge of the heliosphere and the Earth's magnetic field

I'm going to ask about if there is some effect/interaction of the magnetic bubbles that are explained in [1] from YouTube and the Earth's magnetic field. I know these subjects from an informative ...
15
votes
6answers
3k views

What's the actual path of the planets?

I read about Kepler's Laws and in one of them he mentions that the path of a planet is an ellipse, with the sun as one of its foci (I'm narrowing down this to only our solar system). However though I'...
-2
votes
2answers
170 views

Why do we say that the torque on Earth due to Sun is zero?

Let's assume, the mass of Earth = $M$, the radius of Earth = $r$, the moment of inertia due to revolution of Earth = $I$, angular momentum due to the revolution = $L$, distance between the center of ...
0
votes
1answer
80 views

Are the orbits in my simulation correct? [closed]

I'm creating a simulation of our solar system. I used data from https://nssdc.gsfc.nasa.gov/planetary/factsheet/ and I supplied the planets with perihelion and aphelion values. But I'm afraid the ...
1
vote
1answer
50 views

Planar Mercury Orbit

Recently we had an exercise about the precession of Mercurys perihelion. It went like this: Using the Schwarzschild-solution of Einsteins field-equations, we can derive the Lagrangian for a test ...
0
votes
1answer
41 views

Orbit eccentricity and initial velocity

I was thinking about orbital velocities, and came across this question (Velocity of satellites greater than required velocity). Does the answer to this question imply that for planets going round the ...
1
vote
2answers
81 views

Help understanding why Newtonian mechanics doesn't allow planets to follow Rosetta orbits

The argument I am trying to understand is the following: For an orbit to be closed, the angle between successive perihelions (points where the planet at its closest to the sun) must be a rational ...
0
votes
0answers
7 views

Does increasing the atmosphere of Mars cause dust storms to last longer?

This is both a science-fiction question (assuming some terraforming of Mars[crashing asteroids could be fun]) and a physics question about dust particles being carried by the martian winds. Some dust ...
0
votes
0answers
11 views

Expansion of the Universe (within galaxies) [duplicate]

We know that the universe is expanding. The galaxies are moving far away from each other. But what is happening inside those galaxies or inside the solar systems? Is our Earth moving further away from ...
2
votes
1answer
67 views

How big a coincidence is the Sun and Moon having almost equal apparent sizes?

It's consensus that the very similar apparent sizes of the Moon and the Sun as seen from Earth is a coincidence (as already answered in this site). This provides us with almost exact total solar ...
4
votes
2answers
90 views

Why does the sun have the Fe?

I read the information about 'Abundance in the sun for the elements'. There are a lot of elements in the Sun. I thought 'how is it possible to exist Fe, Au, and so on in the Sun ?', but I couldn't ...
1
vote
1answer
60 views

The Precession of the Perihelion of Mercury 43'' / century or 12000 km / century difference to Newton's Laws

I was reading Foundations of Astronomy by M Seeds and was wondering about the precession of Mercury. There he says it is 43''/century or about 29 km per revolution past the position predicted by ...
1
vote
2answers
43 views

In the heliocentric model of planetary motion, is Sun assumed to be stationary at the center? [duplicate]

In Kepler's first law, the earth moves around the sun in a elliptical path. The sun is at one of the focuses. Now, would this suggest that sun is always at the focus? i.e: it's position is fixed?
1
vote
2answers
71 views

Why does the sun and gas planets in our solar system weigh more than the earth?

I was reading a space.com article about What Is The Sun Made Of? The article says that the sun is made of plasma and gas. If this is the case, how is it that the earth which is solid weighs less than ...
0
votes
0answers
51 views

Is it possible to use the Sun's gravity to gain significant delta-v?

Someone asked here whether Sun's gravity has been used for delta-v gain, and from the answers it's not clear whether this is possible at all. There is this rule of thumb that "burning fuel inside a ...
0
votes
4answers
67 views

Would Earth always face Sun the same way if Earth didn't rotate around it's axis?

Imagine for a second that Earth no longer rotates around its axis. It still revolves around the Sun. However, would the Earth: face the same way towards the Sun as it goes around it (permanent time ...
1
vote
0answers
58 views

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 ...
1
vote
1answer
59 views

Orbital Mechanics: Initial velocity of a Parabolic trajectory

If I want to calculate the initial velocity, say for a planet orbiting a massive body, can I use the vis-viva equation in terms of eccentricity, and plug $e = 1$, to obtain the initial velocity that ...
1
vote
2answers
58 views

Why do we have eclipses if the Earth's orbit around the Sun and the Moon's orbit around the Earth aren't in the same plane?

We know that eclipse is when the Sun, the Earth and the Moon align in a straight line. How do they do this align if their orbit planes aren't in the same angle?
0
votes
2answers
43 views

Rotation of planets [duplicate]

Sun attracts earth by gravitation. And similarly every heavenly body attracts others. But why are they rotating? The sun is moving in ellipse in the galaxy, the earth is rotating and revolving and ...
0
votes
1answer
48 views

Gravitional Force of Mercury in General Relativity

I have been searching everywhere for the first order GR term that describes the gravitational force of a mass. Could someone kindly show me the term that describes this?
1
vote
2answers
109 views

Earth's orbit: chaotic but stable

The eccentricity of Earths orbit follows a bounded random walk-like pattern, see this chart. I presume most other planets are similar. One could think of eccentricity and argument of periapsis as "...
2
votes
2answers
54 views

If I use the Earth as my point of reference on a model, would it be valid if I said that the Sun orbits the Earth? (in my model)

What the title says. If I create a model, and I use the Earth as my point of reference, is it valid to say that the Sun orbits the Earth inside my model? Or is claiming that invalid?
1
vote
0answers
76 views

Why is there 'no current induced' as the Earth travels around the Sun?

I have been reading a book on climate change which looks at various methods for generating electricity. One can induce a current by ensuring that a magnet appropriately 'cuts' through a magnetic field....
0
votes
1answer
39 views

Rotation of satellite at Lagrange point $L_1$

What rotations occur due to gravitation for a body placed/anchored at Lagrange point $L_1$ in the Sun-Earth system, which is an unstable equilibrium point? Is the rotation axis vector normal to the ...
2
votes
1answer
66 views

Solar frame dragging

Does solar frame dragging induce a higher centrifugal force to Mercury so its orbit is precessing as well as being more outwards than it should be if there wasn't solar frame dragging?
2
votes
2answers
84 views

Circular trajectories and Kepler's law [duplicate]

I'm studying about the central force and Kepler's law, and I was wondering: by the first law, the trajectories of planets suppose to be elliptical. but from what I understood, most physical ...
-4
votes
1answer
69 views

What is the definition of the average distance between the sun and the earth?

What is the definition of the average distance between the sun and the earth? Let $r(t)$ be the distance between the sun and the earth at $t$. Is the definition of the average distance between the ...
0
votes
0answers
23 views

Existence and evolution of P-type “asymmetrical binaries”

I'm not sure how those are called so let me explain what I mean by "P-type asymmetrical binaries" - I'm thinking of two stars of very different masses (originally) that orbit each-other fairly closely....
0
votes
1answer
18 views

Orbital distances of planets [duplicate]

So is the exponential pattern in the planetary distances related to Johann Kepler's discovery in 1596 that the ratios of the orbits of the six planets known in his day were the same as the ratios ...
1
vote
2answers
79 views

Why temperature of planets decreases as we move far from Sun?

Is there a friction in the space? If yes, then does that affect speed, wavelength and amplitude of an EM wave? And i also want to know, why temperature of planets decreases as we move far from Sun?

1
2 3 4 5
…
12