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Which of the blocked radiation windows will (mostly) open if one where to observe from the surface of Mars, instead of the Earth?

Earth’s atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some ...
some_math_guy's user avatar
4 votes
0 answers
96 views

What are the odds of a planet with an eclipse every time the moon rotated around the planet?

If the orbital plane of a planet and its moon were sufficiently aligned, the moon could cause a solar eclipse every lunar month. What are the odds of that happening? To answer, I would guess that one ...
user121330's user avatar
5 votes
1 answer
437 views

What will it take to start measuring the rotation rate and direction of exoplanets? Which instrument(s) current or future are most likely to do it?

@ProfRob's answer to Is it coincidence that the earth's rotation and revolution are in the same direction? explains several important aspects of models for planetary formation, angular momentum and ...
uhoh's user avatar
  • 30.5k
2 votes
0 answers
76 views

How can I calculate current position of planet in sky

How can I calculate current position of planet in sky from earth's point of view. I want to calculate based on given DATETIME and Location For example, if I see current position of planets on "23 ...
Mangesh Sathe's user avatar
15 votes
2 answers
3k views

Why is it impossible to infer the surface temperature of Venus by spectroscopy observation from earth?

It is well known that the surface temperature of the sun is determined by fitting the sunlight with the black-body spectrum. Why is this inappropriate for Venus? I have the question because of the ...
S. Kohn's user avatar
  • 879
1 vote
0 answers
74 views

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
2 votes
1 answer
118 views

Is an earth-sized moon orbiting a super-earth feasible?

Is an earth-sized moon orbiting a super-earth feasible? Or would tidal forces say 'no thanks'? I'm making a system for the Kerbal Space Program Kopernicus mod and am trying to make it as realistic as ...
spaceman0x2A's user avatar
9 votes
1 answer
1k views

Why would rocky earth-like planets be rare around white dwarf stars?

I came upon an article here https://phys.org/news/2023-11-white-dwarfs-life-planets.html The author thinks that rocky earth-like planets could be rare around white dwarfs.What could be the reason for ...
user avatar
0 votes
2 answers
171 views

What happens to a binary star system when one of the stars explodes and loses a lot of mass

If one star of a binary system explodes and leaves a remnant. The remnant would still have the velocity but lack the mass of the original star.
Michael Mcgarry's user avatar
10 votes
1 answer
146 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
3 votes
0 answers
82 views

Clarifications on Planetary Magnetic Fields

I believe I understand this equation for the dynamo effect of planets as far as iron-nickel cores go, where ρ is density in kilograms per cubic meter, Ω is rotation speed in radians per second, σ is ...
Pyrania's user avatar
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2 votes
1 answer
58 views

When analyzing a particle moving at Kepler speed, √(GM/R) in a planetary magnetic field, do we need to convert it to angular speed, √(GM/R^3)?

A charged particle is moving in a planetary magnetic field, in a spherical polar coordinates which is corotating with the magnetic field. To solve the equations of motion numerically what would be the ...
Lunthang Peter's user avatar
1 vote
1 answer
55 views

Is the magnetic permeability (mu_0) necessary in the expression for planetary magnetic field?

To numerically analyse the Lorentz effect due to the magnetic field, say, radial component on a charge particles which of the expression would be correct, $\{ B_r = \frac{2R}{r^3} g_1^0 \cos(\theta) \}...
Lunthang Peter's user avatar
22 votes
5 answers
8k views

Why is Uranus called a "green planet"?

Uranus is called a green planet, although it appears blue in many of the photographs including those taken by spacecraft, like Voyager 2, Hubble, and JWST. NASA's Uranus page mentions it to be bluish-...
Dhruv Nayak's user avatar
2 votes
1 answer
74 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
16 votes
3 answers
3k views

Under which conditions could a planet's massive moon's orbit get closer to the planet?

The recent question How do we know the Moon was much closer than it is now? has piqued my interest. The answers are numerous and clear. But I started to wonder. The question includes the following ...
uhoh's user avatar
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4 votes
2 answers
108 views

Does rotation on their axis cause winds in gaseous planets?

As far as I know, as planets rotate around their axis, they can influence winds but not cause them (like the Coriolis effect) However, does this apply only for rocky planets? Do rotation alone in ...
vengaq's user avatar
  • 937
1 vote
1 answer
94 views

Looking for a Specific Planet

I know my title isn't the most specific, but the planet I am looking for is. I have been looking through many exoplanets and I can't seem to find what I am looking for, the closest I have found is ...
Amoeba's user avatar
  • 121
6 votes
3 answers
1k views

Concerning a binary system of stars/planets/black holes could one of them be ejected before eventually merging or colliding?

I was having a discussion with an undergraduate student of physics about binaries and their interactions with external celestial bodies (which could cause the ejection of one of the members in the ...
vengaq's user avatar
  • 937
2 votes
1 answer
108 views

Are there any softwares which help in simulating different experiments regarding flight of aircrafts on different terrestrial planets of solar system?

I have a few experiments on aircrafts whose results I am aware of if performed on the earth's surface. However, I am searching for software(s) that can help simulate the same or other experiments on ...
Dhruv Nayak's user avatar
3 votes
3 answers
234 views

Will all satellites get inevitably tidally locked to their planet?

Are there cases or conditions in which an object orbiting another one (e.g. a satellite and its planet) does not get tidally locked to it? For example, in this question, it is mentioned that a large ...
vengaq's user avatar
  • 937
1 vote
1 answer
155 views

how big would an asteroid have to be to leave a crater on Earth

if an asteroid were to hit earth, how big would it have to be to make a crater and not just vaporise in the atmosphere?
sno's user avatar
  • 1,456
2 votes
0 answers
33 views

Could rogue planets with cold nucleus have winds or water currents/waves due to the planet's rotation?

Are there any types of wind or waves caused and produced only and exclusively by a planet's rotation? Not influenced by the planet's rotation, but produced solely by it? In the case of waves, are ...
vengaq's user avatar
  • 937
3 votes
0 answers
74 views

To what extent does the increased average airmass the Sun's light passes through contribute to the seasons?

The traditional explanation for the cause of seasons I have heard is that because of the angle of the axis of the Earth with respect to the ecliptic, the angle at which light rays hit the Earth's ...
Peter's user avatar
  • 31
0 votes
1 answer
207 views

If phosphine gas is to be proof of life on a planet, shouldn't there be other gases too?

If microbes on Venus produce phosphine, wouldn't there also be other gases produced by microbes since earth has many kinds of bacteria and the fast reproduction rate of bacteria make genetic mutations ...
user avatar
1 vote
3 answers
109 views

Does the Drake equation consider how far a planet must be from gamma ray bursters, black holes supernovae etc for life to survive?

Can we use these dangerous phenomena to predict where life can't exist?
user avatar
3 votes
0 answers
70 views

What are radio frequencies sensitive to in galaxies?

Apart from 21cm line studies, radio emissions as well as signatures of different radio sources, do radio frequencies help in the identification of a particular physical structure or presence of some ...
Dhruv Nayak's user avatar
4 votes
1 answer
177 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
1 vote
0 answers
74 views

What do chthonian planets look like?

Obviously, a chthonian is going to be hot, but what colours could it have? What would the surface composition be? Would it keep patterns from the gas-bands it used to have, or would those have been ...
Kazon's user avatar
  • 587
2 votes
0 answers
101 views

Conversion of 1D plot in 3D plot gives different physics

I am to track the path of a particle due to Lorentz force of the planet magnetic field, assuming there is no gravitational force on it. The equation of motion due to Lorentz force in rotating ...
Lunthang Peter's user avatar
5 votes
1 answer
99 views

"And in some cases, a (free floating) planet (FFP) can form on its own outside of any solar system." Cool! But what are those cases?

The April 2, 2023 Inverse article 9 Years Ago, Astronomers Found Two Rogue Planets — But They Didn’t Realize It Until Now says: Planets are typically part of a planetary system and are ...
uhoh's user avatar
  • 30.5k
4 votes
2 answers
377 views

Numerical Programming using ODEINT takes more than 17 minutes

I am trying to track the trajectories of a charged particles under the influence of Gravitational and Electromagnetic effect. Computing for time points, t0=0second -tf= (36002430)sec with stepsize 0....
Lunthang Peter's user avatar
23 votes
3 answers
5k views

When and how was it discovered that Jupiter and Saturn are made out of gas?

Was it due to appearance only or spectroscopic methods were used? Venus also has a thick cloud cover, how was it determined to be a rocky planet?
Astrodhan's user avatar
  • 341
2 votes
1 answer
184 views

What caused the “rake marks” in moon photos?

A conspiracy theorist on Facebook claimed photos from the moon show “rake marks” in the lunar soil. You have to zoom in and look very hard, but I do see a faint pattern of light-colored lines going ...
Justin Morgan's user avatar
4 votes
2 answers
491 views

Can a tidally locked planet sustain a magnetic field

The vast majority of stars in the Galaxy, and probably the universe, are red dwarfs. The habitable zones of these stars are very close to the stars themselves, often within what would be Mercury’s ...
user98816's user avatar
  • 469
-4 votes
2 answers
217 views

Do humans have the capacity to blow up the entire planet earth today? [closed]

For example, if we are able to gather all the available nuclear weapons in place and target towards a weak point, say an earthquake fault line, will the entire planet be blown to bits?
Soundar Rajan's user avatar
2 votes
2 answers
216 views

Effects of other planets on life on Earth

I've heard this often in the media, that the gas planet Jupiter has a significant effect upon life on Earth - by, the say, drawing asteroids & comets to itself, many planet-killer are destroyed as ...
Hudjefa's user avatar
  • 353
3 votes
1 answer
78 views

Do conjunctions of planets block out the sun and cause measurable cooling of the atmosphere on one of the planets?

Is a significant amount of light energy blocked by one planet such that there is noticeable cooling of the atmosphere of another?
user avatar
5 votes
1 answer
140 views

What are these bumps on Europa?

The surface of Europa is famous for all the criss-cross lines thought to be cracks in the ice above a water ocean that somehow re-freeze. But in the photo below I also see a lot of raised "bumps&...
uhoh's user avatar
  • 30.5k
2 votes
0 answers
87 views

How could we detect if Venus or mars were being terraformed by aliens? [closed]

If any other body in our solar system was being terraformed by aliens, what would be the ways in which we would detect this? Initially I thought of Venus or mars but I guess this could extend to any ...
Darth Scitus's user avatar
4 votes
2 answers
893 views

Radio signals between Mercury and the Moon during an eclipse

This is a hypothetical question. Thank you for your time and efforts. A signal is sent from a transmitter on Mercury's surface while it is at its greatest western or eastern elongation. The signal is ...
JM Yaden's user avatar
  • 171
8 votes
1 answer
99 views

Does polar motion cause the Earth ellipsoid to change?

The Earth is oblate because it spins and is not a rigid body. Since its spin axis changes relative to its crust, then the meridian of maximum diameter changes too, right? I understand that polar ...
prideout's user avatar
  • 225
1 vote
1 answer
103 views

In which Indian Institutions can I find Planetary Scientists or Planetary Geologists? [closed]

Which institutions in India provide labs and facilities for research in the field of Planetary Sciences/Planetary Geology?
Dhruv Nayak's user avatar
-1 votes
1 answer
93 views

If 16 million kilometers were added to Earth's semi-major axis, what measurable effect would there be on Mars' orbit?

I have some education in astronomy, but nothing extensive in astrophysics. I can follow mathematical procedure with assistance. Procedural responses are most welcome!
JM Yaden's user avatar
  • 171
2 votes
0 answers
12 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 ...
apk's user avatar
  • 949
18 votes
4 answers
8k views

Do planets lose energy while rotating?

When a planet rotates/spins, is it true that the planet loses energy? If this is true, then where does this energy lost by the planet go? My confusion may be in the basic understanding of the ...
apk's user avatar
  • 949
21 votes
2 answers
3k 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 ...
Wenver's user avatar
  • 211
4 votes
1 answer
625 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 ...
apk's user avatar
  • 949
11 votes
2 answers
3k 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 ...
apk's user avatar
  • 949
34 votes
1 answer
6k views

Why do Jupiter’s moons have so much water?

Why do Jupiter’s moons have so much water by mass? Did all the bodies in the solar system start out with this much water and the planets closer to the Sun simply lost it to space?
Elhammo's user avatar
  • 1,107