Questions tagged [solar-system]

Questions regarding the Sun and objects orbiting it.

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Voyager spacecraft distance from Earth

According with NASA JPL the earth catches up with the spacecraft because Earth is moving a lot faster than the spacecraft. Can one calculate the times when the spacecraft gets closest to Earth
dimitri33's user avatar
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8 votes
3 answers
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Would be possible to detect Planet Nine as a microlensing event along the line of its projected orbit?

Theoretically proposed by Konstantin Batygin and Mike Brown (@Caltech), Planet Nine could have a mass of $\sim 6.3 \pm 2 M_{\oplus}$. Even though I don't know if the hypothesis is still feasible at ...
nuwe's user avatar
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Why do these two sources list different values for the Solar axial tilt to the ecliptic and Earth's orbital inclination to the Solar equator?

On the Wikipedia article for axial tilt the Solar axial tilt is listed as 7.25° to the ecliptic, whereas on the Wikipedia article of orbital inclination Earth is listed as having an orbital ...
Outis Nemo's user avatar
2 votes
1 answer
112 views

On what four dates dates do we observe the minimal, maximal, and two days of zero Solar axial tilt relative to us?

In case the title is a bit confusing, what I'd like to know is essentially respectively on which dates the Solar axial tilt is pointing straight towards Earth, straight away from Earth, and ...
Outis Nemo's user avatar
1 vote
0 answers
116 views

The rocky planet sizes between the Sun and Jupiter are small, big, bigger, small, and unfinished. Is there a reason?

The rocky planet sizes between the Sun and Jupiter are small (Mercury), big (Venus), bigger (Earth), small (Mars), and unfinished (the asteroid belt). Is this just random chance or is there a theory ...
phil1008's user avatar
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Tracking the position of the sun at various times of the day and night for a particular location

I am looking for a website that will provide me with the degree above and below the horizon of the position of the sun at various times of the day and night for a particular location. looking for ...
sunwatcher's user avatar
2 votes
1 answer
95 views

Implementing polar coordinates correctly in solar system model?

I am working on a 2d solar system model using Python, but I'm unsure if my implementation of planet data is correct. I have the planet data stored in polar form (distance, velocity and angle), and I ...
Tmpecho's user avatar
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2 votes
1 answer
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How to flatten 3d astronomical coordinates into 2d polar form in Python

I first asked this at Stack Overflow but got redirected here I am making a 2d simulation of the solar system. For that you need a starting point for all planets. Right now I am storing that data in ...
Tmpecho's user avatar
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5 votes
3 answers
167 views

Why are there gaps in the size distribution of solar system moons?

Looking at the moons natural satellites in the solar system, the larger ones appear to fall in a few groups of sizes. Eyeballing the above picture, there appear to be a bunch of big moons (the ...
JanKanis's user avatar
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2 votes
1 answer
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Chiron ephimeris calculations

I am able to find the current location for 95P/Chiron using swisseph with a simple code but i am interested into trying to calculate longitude crossings including retro etc .. but at first i only ...
dimitri33's user avatar
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3 votes
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How much mass did the Late Heavy Bombardment add to Mars?

How much mass was deposited on a terrestrial planet during the Late Heavy Bombardment (LHB)? Is it possible to estimate a reasonable interval, specifically, for Mars? Could the mass addition to Mars ...
Michael_1812's user avatar
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8 votes
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Why did the dust between the planets disappear during the birth of the solar system?

I'm catching up on my childhood mistakes. One of them was the "nuclear flash", the enormous explosion when the sun ignited. Apparently, this did not happen as the ignition of the sun was a ...
Dominique's user avatar
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0 answers
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How to plot right ascension with time of the retrograde motion of mars? [closed]

Measure the right ascension, declination of mars and sun. plot the variation of right ascension with time.
user avatar
2 votes
1 answer
371 views

How did the temperature of the solar system evolve?

As a child, I've read that stars ignite during a so-called "nuclear flash". I understood this as a very violent outburst of energy from the sun, causing all dust between the protoplanets to ...
Dominique's user avatar
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Calculating the absolute magnitude of a solar system body

I am trying to calculate the absolute magnitude of a solar system object, given its albedo, and assuming all of its luminosity comes from reflecting light from the sun. Using $L_{sun}$ = solar ...
CuriousCosmos's user avatar
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24 views

Solar system datasets for exoplanet analogs?

Are there data from the solar system available, that are about quantities we regularly investigate in exoplanet searches? The only collection I know of comes from this paper: "A Catalog of ...
Helen's user avatar
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2 votes
1 answer
220 views

The Poynting Robertson Effect

In the Poynting Robertson effect, it says in general, the Poynting Robertson effect is caused by the fact that objects like dust re-emit the light they absorb. Is that correct? Is this effect weak? ...
A Curious Mind 's user avatar
10 votes
1 answer
140 views

How is a Planet's Moment of Inertia Measured Remotely?

In the July 2023 issue of Sky & Telescope there is an article titled Sights Set on Uranus. In that article the following statement is made: Since the 1930's we've suspected that Uranus and ...
GrapefruitIsAwesome's user avatar
0 votes
1 answer
120 views

Have gas or dust or rock accumulated in our solar system on its 20 orbits around the Milky Way?

Also,does the absence of the accumulation of anything large such as rogue planets by the solar system suggest the Milky Way has been orderly and stable for billions of years?
user avatar
12 votes
2 answers
4k views

Does the Oort cloud have any large holes in it and if not does this mean nothing large has entered the solar system for a long time?

Would holes in the Oort cloud be a record of what has passed through it?
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15 votes
1 answer
470 views

What's the reason for the hollow region in Oort cloud?

Can someone please tell what caused the hollow space (pointed by yellow arrow) in the Oort Cloud? I understand that it is called cloud because the cluster of objects does not align with the major ...
Kevv Keka's user avatar
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3 votes
1 answer
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How was this image of the faculae in the Occator crater obtained?

The picture in question (that I'm asking about) is at the bottom, of this post. Now, did they simply take a picture with reduced light intake? If so how much? 1/2, 1/4 or 1/8 or less? Or did they ...
Sven _Andersson's user avatar
5 votes
1 answer
609 views

Difference in results between JPL Horizons and cspice (rust-spice)

I am calculating the apparent planetary position of planets using the cspice library (I am specifically using rust-spice, which is a wrapper of cspice in Rust). when I calculate the same values in the ...
AviD1511's user avatar
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4 votes
1 answer
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derivation of reduced magnitude of asteroids

I've noticed that there is this parameter called reduced absolute magnitude $V(\alpha)$ and it is defined as below according to the paper by Mahlke et al. 2021 https://doi.org/10.1016/j.icarus.2020....
mysterium's user avatar
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4 votes
1 answer
371 views

Does the Oort Cloud lose mass with time?

Can blocks of ice escape from the Oort cloud and away from the solar system forever?
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2 votes
1 answer
102 views

Motion of solar system around Milky Way

As our solar system performs its +-230 million year lap around the Milky Way, is the orientation of the ecliptic plane preserved independent of the center of our galaxy, or does the plane perserve its ...
DanO's user avatar
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14 votes
1 answer
3k views

Why is Mercury's orbit so unusual?

Mercury's orbit has the most eccentricity, 0.2, of all the planets. And this orbit is also the most inclined relative to Earth, 7 degrees. Edit: And to the invariable plane, it is inclined 6.35 ...
DrZ214's user avatar
  • 1,940
4 votes
3 answers
280 views

A solar system of solar systems

The moon orbits Earth, earth orbits Sol. It's true that Sol orbits the galactic center, but that's not what this question is about. Is it possible for a solar system like the Sol system, along with at ...
JBH's user avatar
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1 vote
1 answer
101 views

Does the Sun have different unique orbits around barycenters?

After reading this question and seeing its image I thought about this question I'm going to publish. Does the Sun have different unique orbits around the barycenter for its multiple planets? If yes, ...
Snack Exchange's user avatar
3 votes
1 answer
146 views

Cooling the early earth

My son had this theory that the icy comets cooled the hot earth during the late heavy bombardment. What do we know about this cooling effect on the early evolution of the earth? He intended his theory ...
user442920's user avatar
2 votes
1 answer
69 views

What secondary and tertiary conclusions can be drawn from the temperature characteristics of lunar soil sent by ISRO Chandrayaan 3?

ISRO Chandrayaan 3 released the following data today about the temperature characteristics of lunar soil. What secondary and tertiary conclusions can be drawn it? More specifically, what may be the ...
Ritesh Singh's user avatar
6 votes
2 answers
1k views

What determines the edge/boundary of a star system?

According to Education.nationalgeographic, "A star system is a group of planets, meteors, or other objects that orbit a large star. While there are many star systems, including at least 200 ...
Hikerguy's user avatar
2 votes
1 answer
118 views

Are the rotational axes of Earth and Mars parallel?

So I was stuck on a question involving the transformation of coordinates from geocentric to Mars-centric coordinates. The relative position of Mars and its orbital details are given. I thought that we ...
Aarush Mishra's user avatar
2 votes
1 answer
115 views

What is the "structure" of the Solar System while traveling through Space?

On the Image above, the arrows pointing upwards depict Solar System's travel direction. The arrows pointing to the right show its own direction of rotation and the direction of the planets within it ...
Pika-Chu's user avatar
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11 votes
2 answers
5k views

What would happen if Venus and Earth collided?

The first thing we would need to consider is that Earth has already been hit by a protoplanet half its size 4.5 billion years ago, meaning the Earth may have a chance of staying intact after the ...
user avatar
5 votes
0 answers
87 views

Are dust-dust collisions necessary to explain Kordylewski clouds at Earth-Moon L4/5? Aren't the cross-sections, number density timescales too small?

The recent question Can dark matter accumulate at Lagrange points? mentions Kordylewski clouds and that article begins: Kordylewski clouds are large concentrations of dust that exist at the L4 and L5 ...
uhoh's user avatar
  • 31.3k
5 votes
0 answers
171 views

Why does the tropical year have a ~161 years cycle?

Using PyEphem, I calculated the time difference between consecutive summer solstices in the south hemisphere for the last 4000 years, and plotted them in a graph. It seems like random noise around the ...
ordptt's user avatar
  • 173
-4 votes
1 answer
76 views

Did liquid helium help the solar system to form by cooling the nebula that collapsed to form it?

Was the gas cloud that collapsed to form the solar system cooled by liquid helium at some point in time? I ask because the Cosmic microwave background had a temperature around 3K when the solar system ...
user avatar
4 votes
1 answer
157 views

Where can I get raw photos of planets clicked by HST, Voyager 1 and 2, Cassini for Saturn and Galileo for Jupiter?

I intend to process RAW images of planets clicked by HST,Voyager 1 and 2, Cassini and Gallileo spacecrafts using a few softwares. I am in search of where I can get these raw images from.
Dhruv Nayak's user avatar
2 votes
1 answer
94 views

Conditions on Earth when Mars was warmer, wetter & had a thicker atmosphere

To the question, What part of a star's habitable zone has the best chance of developing life?, I made the following comment: It's always intrigued me as to why some people have thought that life in ...
Fred's user avatar
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3 votes
0 answers
82 views

Why do planets in our solar system have different chemical compositions? [duplicate]

Was this caused by turbulence in the disc that went on to form the solar system or was the disc itself just endowed with an uneven distribution of elements?
user avatar
0 votes
0 answers
40 views

Can gravitational waves cause a large asymmetric planet to spin?

As planets orbit Earth it won't be perfectly spherical because of gravity But can gravitational waves make the asymmetrical Earth spin a little?
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1 vote
1 answer
326 views

How to calculate solar ecliptic longitude

I would like to write a small script to calculate solar ecliptic longitude in relation to different locations and dates. For instance UTC + - 1...2 etc.. I know, solar ecliptic longitude is the ...
Robert's user avatar
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0 votes
1 answer
192 views

How certain is the Sun's classification?

Curious Question here. How do we know the Sun is a G-Type Star? Our sun (Classed as G2V) apparently lies around the 5,780 Kelvin. Yet NASA generalizes it as 6,000 K- and is apparently white even ...
Andyhasaquestion's user avatar
1 vote
3 answers
1k views

Do the inner-Earth planets actually align with the constellations we see?

For example, because the Sun is the center of the solar system; when we think that the Sun is on the constellation of Aries, in actuality, isn't Earth lining up with the constellation opposite Aries: ...
Atlas's user avatar
  • 67
3 votes
1 answer
205 views

Outer Limit of Oort Cloud

In most popular astronomy articles I see the Oort Cloud described as having a radius of about two light years. Is there any firm basis for this or is it merely a guess? If it is that big, and Alpha ...
Mike Stone's user avatar
3 votes
1 answer
49 views

Protoplanetary disk luminosity - looking for a sanity check please

I've been told to "consider an Earth-mass of interplanetary grains (roughly spherical with a radius of a few microns) in a protoplanetary disk. Let the particles be in a torus with a cross-...
Chris M's user avatar
  • 31
4 votes
1 answer
71 views

Periodic motions that affect earth axis tilt

It is said that the earth axis changes its tilt with a period of 41 000 years. So used the image https://upload.wikimedia.org/wikipedia/commons/1/17/Obliquity_berger_0_to_1000000.png removed the grid ...
user877329's user avatar
2 votes
0 answers
113 views

Was the recent blue spiral over Hawaii really a SpaceX rocket dumping fuel?

Is the observed phenomenon really consistent with a SpaceX rocket dumping fuel or decelerating or something? I'm skeptical. There are several things to discuss. The speed of the blue spiral is much ...
Sven _Andersson's user avatar
2 votes
1 answer
409 views

Is the solar system barycenter affecting the Earth weather?

I do not have the numbers but I guess the solar system barycenter should move much more than the Earth radius, and if that is correct then it should not be affecting the Earth's temperature. I mean, ...
Enrique's user avatar
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