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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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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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 ...
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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?
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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 ...
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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?
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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 "...
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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?
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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....
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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 ...
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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?
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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 ...
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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 ...
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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....
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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 ...
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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?
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Why do the orbits of smaller bodies (e.g. comets and dwarf planets) have higher eccentricity?

Larger planets eg. Earth, Mars $( e< 0.01 )$ have almost circular orbit, whereas orbits of smaller planets like Pluto ($ e \approx 0.25 $) and smaller entities like comets have much larger ...
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Misunderstanding of how the Sun losing mass makes the Earth orbit increases in size

The radius of the Earth orbit increases by about 15 cm per year. One of the main argument found online to explain this is the fact that the gravitational pull of the Sun on the Earth diminishes over ...
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Why doesn't the Sun gravitate Mercury so that in following years, Mercury goes inside the Sun? [duplicate]

There has been news in public about Mercury that passes in front of Sun which happens very rarely every 100 years, here. So people on Earth can see it through special kind of telescope, of course, ...
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Will August be always summer in the northern hemisphere?

Is the Earth orbit precessing, or are there other effects which will create a shift between our calendar (day counting), and the Earth's orbit? I imagine these effects to be small, but I'm asking for ...
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Is Newton’s gravitation law able to explain the circular motion of the earth around the sun?

I have read in Forbes website that the orbit of the earth around the sun is expanding (by 1.5 cm in 2019). I have also heard that big bang theory suggests that the universe would collapse into ...
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Motions of planets from a non-rotating earth frame

Suppose you are hovering just above the earth at a fixed distance such that you are not rotating with it (the earth is obviously rotating about its own diametrical axis) but you are orbiting the sun ...
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Converting units for N-body simulation for the solar system

I am implementing a test particle integrator for the solar system, now I've gotten to the phase where I want to test the orbits it integrates. I want to start with the Sun and the Earth (massless), ...
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Solar system and $n$ body problem [duplicate]

How is possible for the solar system to be stable if has been proved that even the trhee body problem is chaotic with a very small amount of stable solutions? Do we need to consider the solar ...
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Can we rule out life swimming in the oceans of Europa and Enceladus on the basis of a lack of available energy?

Jupiter's moon Europa and Saturn's moon Enceladus (and several other moons too) have large subsurface oceans of liquid water, an ingredient considered essential for life. These two moons occasionally ...
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Why is Jupiter's ring system so faint?

Planetary ring systems are formed when asteroids, comets, or any other large objects pass too close to the planet and are torn apart by the planet's gravity [1]. Jupiter is often called the "punching ...
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Why does this simple equation predict the Venus surface temperature so accurately?

Assume the atmosphere of Venus behaves much the same as Earth. However, it is closer to the sun, has a thicker atmosphere, and is less massive. Further assume: The insolation should follow the ...
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Can dark matter explain the unusual orbit of transnettunian objects? [closed]

While we are struggling to find an hypothetical planet 9 to explain the unusual orbit of transnettunian objects, I was wondering if it could be just dark matter. We know that the universe is mostly ...
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Is space-time fabric around Uranus tilted?

I am completely new in this field, so please pardon me if I am asking something which makes no sense at all :) The Situation: According to Einstein's theory of relativity, there is a 4th dimension ...
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Can we deorbit space trash into the sun by splitting it in two?

So there's an issue of deorbiting stuff because if you just deorbit it a little, it'll enter a more elliptical orbit but still hit you in the back when you return to this place a year later. Size and ...
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What is the total mass of orbiting interplanetary unbound atoms in the solar system?

Excuse the poor phrasing of the title, but it became apparent to me that the solar system has some degree of density (i.e it is not a perfect vacuum). So my question is if any of these particles (not ...
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Why does earth not follow the same rule around sun as moon follows around earth?

As you all know that only one side of the moon faces earth through the whole of its journey. The reason why it happens can be owed to the fact that the center of gravity of the moon (because of ...
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About Mercury perihelion again

Sorry to bother you, but I did not get anywhere answer what exactly moves Mercury periapsis. "Sun gravity" or "GR" or "warp of spacetime" are very broad answers, I want to know how they affect this ...
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Angular Momentum — AP Physics C

Do all of the planets in our solar system have the same angular momentum? If so, why? I'm not sure if the following is correct: If we could drag a planet radially outward from the sun, then no ...
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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,...
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How do we know the Moon has a 0.50 angular degree from us?

Before we knew the distance to the moon, how can you get the exact angular degree of it without knowing the distance to it? Obviously you can just guess or assume but how was it first calculated?
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Recent/More accurate rotation velocity measurement?

I've been researching for papers for hours and can't seem to find this. Where can I find the most accurate equatorial rotational velocity measurement for Mars?
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Do all the planets in our solar system orbit the sun in the same direction and in the same plane?

Do all the planets in our solar system orbit the sun in the same direction and in the same plane? (as in a flat orbit if you are looking from "above")
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Ever looming shadow

If I'm not mistaken the reason the moon eclipses the sun is because the ratio of distance to size, in regards to the moon and sun, is 1:1. And is it not also true that the reason we only ever see one ...
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Shouldn't cosmic rays slow down Earth's movement around the Sun?

Maybe a dumb question. Are cosmic rays slowing down earth's (or any planets) movement around the sun? To me it sounds like an analogy of moving a mass through air and being slowed down by the impact ...
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Let's say that the Sun moves away from us, this should cause a change in gravitational force, when will this change be noticed by us?

I have studied Newtonian physics, and was having a introduction to relativistic physics. I read a similar question in 'A brief history of Time' which is now not letting me sleep.

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