Questions tagged [solar-system]

Questions regarding the Sun and objects orbiting it.

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6 votes
1 answer
2k views

What is the orbital period of our sun around its barycenter?

In years, what is the time it takes our sun to orbit around our solar system's barycenter?
18 votes
2 answers
5k views

How many undiscovered planets might be in our solar system?

Some people talk about the possibility of a planet 9. Could there be a planet 10 or 11? How many undiscovered planets could there be in our solar system?
2 votes
1 answer
48 views

Single axis solar tracker tilt angle calculation

I'm working on single axis solar tracker project. Solar panels will towards the sun with maximum angle from sunrise to sunset. the panel direction is east-west or near east-west. I need to make angle ...
3 votes
2 answers
159 views

Could a planet theoretically have a stable orbit between Venus and Earth OR Earth and Mars

Take a planet, identical to Earth in size, mass, gravity, rotation, etc.(but without the moon). Could this planet theoretically maintain a stable orbit for many hundreds of millions of years orbiting ...
1 vote
0 answers
9 views

What are different forces acting on a planet which may be related to axial tilts?

In our solar system, we see that the axis of rotation of planets is tilted forex. The axial tilt of Venus is near 179 degrees. Venus, Uranus, and Pluto have large values of axial tilt(more than 90 ...
2 votes
1 answer
91 views

Initial state for a 3-body problem to create Figure 8 [ restricted to 2D ]

I've made an n-body simulation solution using the naive algorithm of O(n^2) in my library ChelseaaJS. I was trying to make some pleasing 3 Body simulations. I wanna do the 8 figure thing. I know it's ...
18 votes
2 answers
2k views

Are heavy elements equally distributed throughout the Solar System?

I want to know if heavy elements are distributed roughly evenly throughout the Solar System or if they are (excluding the Sun) concentrated mostly in a particular area, such as the inner part. Would ...
4 votes
1 answer
312 views

Calculating net gravitational force on Uranus

I want to calculate the net/total gravitational force which is being exerted on the planet Uranus. There are many objects in our solar system like the Sun, other planets, moons of other planets, moons ...
11 votes
1 answer
2k views

How scientists find the direction of rotation of planets?

How do we know that Mercury, Earth, Mars, Jupiter, Saturn, and Neptune rotate counterclockwise and Venus, Uranus, and Pluto rotate clockwise? How do scientists determine the direction of rotation of ...
3 votes
1 answer
77 views

What are the time periods of precession of equinoxes of other planets?

Earth has a time period of 26000 years approximately for precession of its equinoxes. What are the time periods of precession of equinoxes of other planets?
2 votes
1 answer
50 views

absolute magnitude of an asteroid

I've done some research and found that one could derive the absolute magnitude $H$ of an asteroid in the following way. $H$ is the brightness of the asteroid, observed on Earth, if the asteroid were ...
2 votes
0 answers
64 views

Besides Luna, are there any models of how moons become spherical and round?

Question Given the theorized exceptional formation of Luna, (Giant-impact Hyphothesis, Wikipedia), are there any similar animated models of how the other, much smaller, moons in our solar system ...
3 votes
1 answer
1k views

Does the Sun shift periodically between prograde and retrograde rotation about its axis?

Prograde means rotating in the same direction in which most of the planets in our solar system rotate, which is counterclockwise, and retrograde rotation means the opposite, i.e., clockwise rotation. ...
0 votes
0 answers
84 views

How to calculate absolute magnitude of planets?

Knowing: Star's radius $r_s$ , luminosity $L_s$, and absolute magnitude $V$ Planet's radius $r_p$ , albedo $a$ , and distance $d_s$ How can you calculate the absolute magnitude of a planet in a ...
6 votes
0 answers
135 views

Why do the Sun and gas planets rotate faster at equator than at poles?

From this site, it states that: The Sun spins faster at its equator than at its poles. I have also read somewhere that the gas giants (gaseous planets like Jupiter, Saturn, Uranus, and Neptune) also ...
2 votes
1 answer
88 views

Does interplanetary magnetic field interact with the planet's own magnetic field?

The Wikipedia states on the page about the Interplanetary magnetic field that The interplanetary magnetic field (IMF), now more commonly referred to as the heliospheric magnetic field, is the ...
4 votes
1 answer
149 views

Do moons of rocky oblate planets migrate to low inclination over time? If so, does the time it takes depend on the Moon's size?

Discussions elsewhere suggest that this happens and that smaller moons would tend to low inclination with respect to the planet's equator faster than larger ones. For example, Mars' small moons are ...
3 votes
0 answers
79 views

Why does the axis tilt (obliquity) of Earth change over time?

I have recently learned that the polar axis of Earth moves in a complex fashion. There are both precession and nutation. I have learned that Earth's obliquity varies between 22.1 and 24.5 degrees on a ...
2 votes
0 answers
48 views

At which point does the inner solar system end and the outer solar system start [duplicate]

I've heard how the inner solar system ends at the asteroid belt but where in the asteroid belt?The start?The middle?The end?Is there an exact distance that is put in place?
17 votes
1 answer
729 views

Can the paper narrowing Solar System's barycentre to within 100m help find Planet Nine?

I've just read this recent news article, Astronomers Have Located The Centre of The Solar System to Within 100 Metres, reporting on a paper[1] that claims narrowing the Solar System barycentre to ...
1 vote
0 answers
55 views

Does the north pole of the Solar System (with respect to the invariable plane) point towards the galactic center?

How is our Solar System as a whole (not the wobbly Earth) tilted with respect to the invariable plane of the Milky Way? I understand our Sun's north pole is largely pointing towards our direction of ...
1 vote
1 answer
1k views

Looking for planetary position calculation

In Hindu astrology, for creating horoscopes (birth charts), I am looking for calculations of planetary positions. So, how could I calculate planetary positions according to given date, time and place?
5 votes
1 answer
942 views

What was Earth's mass before the collision with Theia?

Assume the "Big Splash" or "Giant Impact" (whichever name you prefer) theory is more or less correct. EDIT: With so many variations of this theory, with so many names and ...
14 votes
2 answers
2k views

How it is not possible to say if Titius–Bode law is a "coincidence" or not?

From Wikipedia: No solid theoretical explanation underlies the Titius–Bode law – but it is possible that, given a combination of orbital resonance and shortage of degrees of freedom, any stable ...
1 vote
2 answers
169 views

If all objects move, where do we go?

Yes I know that the sun and planets in the solar system travel fast with an average speed of 448,000 mph. Are we going to the center of the galaxy? If so, does that mean our galaxy is getting smaller ...
9 votes
2 answers
9k views

How did they decide the length of one year even though it wasn't known that earth revolves around the sun?

It takes one year for the earth to go around the sun, but one year was already this long when they didn't even know that the earth revolves around the sun at all. So how did they figure it out?
3 votes
2 answers
418 views

Are the planets Mercury, Saturn, Uranus and Neptune losing mass?

My understanding is that Venus, Earth, Mars, and Jupiter are all losing mass due to their gravity, temperature, and the solar wind. But what about Mercury, Saturn, Uranus, and Neptune? Mercury has a ...
1 vote
1 answer
92 views

Can gravitation waves break Solar System equilibrium?

Can gravitation waves, emited from black holes, break Solar System equilibrium and make a planet leave orbit or fall onto the Sun? And if it's probable can we measure this probability?
3 votes
1 answer
75 views

Does the observed Perihelion precession of Mercury still deviate from prediction?

In Wikipedia section about the Perihelion precession of Mercury, we have the follwing table titled "Sources of the precession of perihelion for Mercury": Amount (arcsec/Julian century) ...
4 votes
2 answers
486 views

Precision in the measurement of the distance to the Sun

How precisely can the distance to the Sun be measured? Wikipedia says the distance to the Moon can be measured upto millimeter precision. But Wikipedia article on distance to the Sun says only about ...
1 vote
0 answers
116 views

Nbody problem solving on python with Leapfrog

I am relatively new to astronomical programming and I am trying to code a simulation of the solar system as simplified as possible on python. To do so, I am using numpy in order to have one array ...
-3 votes
1 answer
170 views

Angular velocity of planets around Earth, and Sun

What are the values of angular velocity of planets around Earth, and Sun? I am looking for these two sets of values.
1 vote
2 answers
137 views

Comet Bernardinelli-Bernstein; could it be a "planet-killer" and what could prevent it from getting close to us?

The huge "mega" comet C/2014 UN271 (Bernardinelli–Bernstein) 80 miles wide is coming towards Earth from the edge of our Solar System. It is supposed to only get to the middle of our Solar ...
2 votes
1 answer
58 views

How to explain this elongation frequency diagram between the Sun and the Moon

Intrigued by my recent question about the average angular distance between the Sun and the Moon, I tried to inquire this little more in attempt to find the source of the asymmetry. Basically I have ...
5 votes
2 answers
202 views

What is the average angular distance between the Sun and the Moon?

Naturally we would expect the average angular distance(*), to be exactly 90°, for although the Moon is not running in uniform speed (or rather, to be more precise, the relative angular speed of the ...
3 votes
1 answer
108 views

How the "precession of the ecliptic" can be distinguished from the "precession of the equator"?

The precession of the equinoxes (AKA general precession) is composed from two components: A dominate component which is caused by the the tilt of the Earth's axis - which is called "precession ...
-3 votes
1 answer
90 views

Is the solar system the only survivor of cosmic evolution? [closed]

A question has entered my mind, we know that all the phenomena in the universe are several thousand light years away from us, so the light we see from them is related to the past few years, now my ...
3 votes
1 answer
58 views

Does the magnetosphere of Jupiter protect the Galilean Moons from solar flares?

Teasing out a sci-fi story and would like to get things right science-wise. Sun's about to flare (yes, I know we're not great at predicting that yet but near future) and Earth's doomed. Would the ...
3 votes
2 answers
105 views

constant semi-major axes of the planets

in Numerical Expressions for Precession Formulae And Mean Elements for the Moon And the Planets (Simon et al., 1994), the orbital elements of the planets are given for long time durations. The semi-...
1 vote
2 answers
99 views

Planet's distance data from JPL Horizons - Mars Curiosity mission

I am looking for distance measurement in AU between planets and Earth. E.g. For Mars, Current distance, or distance of Mars from Earth at any given datetime, along with minimum (closest approach), ...
-2 votes
1 answer
81 views

Is it possible that Planet 9 was thrown out of the Solar System? [duplicate]

Is it possible that this planet changed other planet orbits (from which we assume that it exists) but then was thrown out of the Solar System in past when Sun was close to some other star? And it ...
3 votes
1 answer
126 views

North Stars of each Solar system planet?

What are the North Stars of each individual body points too? E.g. Earth points to Polaris. Mars points to Deneb/Alpha Cygni. What about Sun, Mercury, Venus, Moon, Jupiter, Saturn, Uranus, Neptune, ...
0 votes
1 answer
95 views

Solar vs Planetary

Am I correct in thinking that although our solar system is a planetary system we are the only ‘solar system’ in our universe simply because of the name of our sun?
-1 votes
1 answer
83 views

Do Stars other than Sun, have its own solar system ? How different are those from our Solar system? [closed]

This will sound like a idiotic question so apologies if I make you want to roll your eyes but... so we look into our night sky and we see the stars, does each of the stars we see have their own ...
4 votes
2 answers
4k views

Why are gas giants colored the way they are?

As I understand it, Jupiter, Saturn, Uranus, and Neptune are all made primarily from varying proportions of hydrogen and helium. Despite this, Jupiter is very red, Saturn is yellow, and Uranus and ...
17 votes
2 answers
269 views

How do we know that the planets of our solar system began their formation at more or less the same time?

A long time ago, when I had to help my children with their homeworks, I often had the vexing question « how do we know ? ». It is true that reading a middle-school science textbook is like reading ...
4 votes
0 answers
160 views

Could or has a Ninth planet ever be "formed" in our solar system?

As I get along with the answers in my previous question, that planet formation depends on accumulation of planetesimals. So is there any chance that a planet nine would form or any of the Trans-...
28 votes
4 answers
6k views

Which planet came first in our Solar system?

I always wonder which planet came first in our solar system? Sources suggest that Jupiter might be the first planet in our solar system, but how did our solar system evolve into an 8 planet system?
4 votes
0 answers
113 views

Longest time after an image was taken when a new solar system body was discovered from it?

This answer to If there's nothing special about Pluto, why was it discovered so early? says: In fact, often objects are discovered to be in pictures from long ago, such as Orcus, discovered in 2004, ...
3 votes
0 answers
83 views

How do JWST and Hubble compare in detecting small bodies in the solar system that are a) white, b) black, c) Arrokoth-like, d) Voyager-like?

Assume the object is small, spherical, and illuminated only by the Sun, and has some apparent motion. The object is either: a) white - reflecting 100% perfectly diffusely (assume low temperature) b) ...

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