Moon Definition and 1000 Threads

My scenario is as follows: A moon with sufficient size and atmospheric pressure to allow for liquid water on the surface orbits a gas giant which in turn orbits a red dwarf star. The life on this moon is adapted to levels of radiation that would kill human beings. Part of the adaptation is...

At least for a little while https://www.sciencealert.com/earth-welcomes-a-new-mini-moon-later-this-month

Protagonists need to 'improve' many ~10mm OD 'mini-musket-ball' spheroids' sphericity. They've been made by chopping 10mm steel rod stock to 2/3 cm lengths, zapping to molten with eddy-current coil in inert atmosphere, the now-round blobs allowed to cool along a low-g drift-line. But they're...

Fro phys.org "The team in California has used math to calculate the difference in time passage between the Earth and moon, and also between both bodies and the solar system's barycenter. In so doing, the team found that time on the moon ticks by at 0.0000575 seconds faster per day (57.50 µs/d)...

If for any reason, the moon were forced into a more extreme elliptical orbit to earth where its perigee was much closer to earth and its apogee was much farther, what kind of affects would we expect to see? Also, would the moon's perigee cause more frequent or more severe earthquakes?

I am writing a saga of multiple stories set at different time periods in a fictional version of our real world. At a certain point in the worlds timeline, in the next thousand or so years of the current real world time, an extinction level event wipes out all civilization and most life on earth...

I dont know much and you can dumb it down as much as you like or not. I've recently gotten very curious about light propulsion and i was reading that if a laser or beam of light was directed at a solar sail it could generate mass amounts of energy and be used to travel to deep(er) space. I was...

I learned recently that there are plans to create a dedicated global satellite navigation system (GNSS) for the Moon, so we will have atomic clocks on and around the Moon, but we have at least one there now, in order to compare it with a clock on Earth? You know about such an experiment and its...

What do you think????

It didn't work and I don't know how to do it.

TL;DR Summary: Solar sytem forces on Unity Hello ! For my last year in my school, I've got a project to do, and I wanted to recreate the Solar system with forces on Unity. My forces are Velocity and Acceleration (I'm using the Frenet's formulas). I'm sorry I'm not a physicist and that's why...

I remember when the album appeared. It was different. https://www.theringer.com/music/2023/3/1/23617038/pink-floyd-dark-side-of-the-moon-legacy-anniversary-50th There was a lot of great music that year: Aerosmith, Aerosmith, January 5, 1973 Blue Öyster Cult, Tyranny and Mutation, February...

Hi. I am looking for scientific papers, articles and/or even simulations that investigate how many moons it would be possible for earth to have and maybe modern theories about what these moons can be and look like (i.e what characteristics they have) if they were to exist. I have googled and...

Hi, I'm looking to improve the precision of a system over a several hour cycle of operation of +50°C operation. The mass is ~11g and is suspended below the balance via a factory provided point. The "sample" is enclosed within a large borosilicate flask 150mm dia x 450 mm height that is trace...

Surface acceleration is proportional to density and radius of planet (as 2 powers of R cancel with the volume) g(moon)/g(earth) = density(moon)*radius(moon)/density (earth)*radius(earth) = (1/4)*density(moon)/density(earth)

Good afternoon, I am working on writing a story that is set on a habitable second Moon. I suppose I could easily say it's a mild planet that splits into three main seasons and make up some story about how the first Moon appears every so often for a month of phases and then vanishes. As a...

Hello, I found this question on the Internet and I would like to ask for help, if anyone knows the answer to it? At what time of day at the autumnal equinox can we observe the third quarter moon on the western horizon?

I think so. What do you think?

The Moon will occult Mars in less than a week for a good chunk of the northern hemisphere. That's the evening of Wednesday, Dec. 7th, for all of Canada and much of the United States. That's the wee morning hours of Thursday, Dec. 8th, for much of Europe...

How did the first scientists figure out the orbital radius of a moon of Jupiter? How can observations lead to a calculation of the orbital radius of a moon of another planet?

I’m with everyone else cheering the Artemis launch and the whole return to the moon bit, but I can’t quite see why reusable booster technology wasn’t used. I realize trade studies are just that, studies. So an answer might be complex. The standard answer is reusable boosters can’t lift as much...

Researching this I found that the usual explanation was that it was an 'illusion'. However this explanation, in my opinion, does not stand-up to the laws governing the transmission of light. I proposed that as light travels in a straight line this poses a problem for moon tilt. Most of the...

The Flight Readiness Review (FRR) for Artemis 1 concluded - the rocket is on track for a launch August 29, 12:33 UTC (08:33 local time) or in the two hours afterwards. Backup launch windows are daily from September 2 to September 6. The first flight of the Space Launch System will launch an...

The wikipedia article on Lunar distance contains a confusing graph. The graph seems to suggest that the eccentricity of the lunar orbit is maximal in january and ~july, and minimal in april and ~october. I think the eccentricity should be constant. Is wikipedia right or wrong, or is there some...

"If the Earth were not spinning, you would be heavier as you would feel the full force of gravity."so how does this apply to the moon? the moon does not rotate and therefore you would experience the full force of gravity as stated above,yes,,yet the appolo missions film footage showed...

A station is orbiting a planet at a distance R1, a moon is orbiting the planet at distance R2 with the period T. The planet itself has a radius rp and a mass mp. We know that when an object adds its velocity at a point in the orbit, the height of the opposite orbit will increase. Determine the...

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It's an MCQ, and I chose 4/81 v(esc). Is this correct? There isn't a marking scheme... :cry:

I've seen Chasing the Moon several times but it's on a PBS TV channel now and I'm watching it again. It's just amazing how brave those astronauts were and the technology that got them there.

https://arstechnica.com/science/2022/01/an-old-falcon-9-rocket-may-strike-the-moon-within-weeks/ https://www.projectpluto.com/temp/dscovr.htm

Hey guys! I will pass an illustrated problem, below. - We know that the solar rays that reach the Moon and Earth are practically parallel; - We know that the lunar orbit with respect to Earth lasts 27.322 days or 2,360,621 seconds; - We know that the lunar orbit with respect to the Earth is...

Could they generate enough lift for 1/11th the weight of a human? Was picturing a giant warehouse and curious if it would work!

I was already puzzled by the concept of orbiting a Lagrange point and then I find out it's about the same size orbit as the Moon. I am thinking that if there was no Moon that the Earth and the Sun are far enough away to be treated as points and so that there would be an exact distance further...

From the givens: Approximate Earth as a sphere: ##I_e = \frac{2}{5}MR^2 = \frac{2}{5}(5.97x10^{24})(6.371x10^6)^2 = 9.69x10^{37} kg*m^2## ##\omega_e = 7.29x10^{-5} \frac{rad}{s}## To calculate the rate of precession of the disk the Earth precesses around (1 revolution every 26,000 years)...

Early in the pandemic there was, at least in the U.S., a concern about toilet paper shortages. It all seems so quaint now but there were actually runs on t.p. in supermarkets and people were hoarding it. There are of course other ways to clean up afterwards. I reckon that most people in the...

I am considering writing a story that features aliens indigenous to a planet orbiting a red dwarf star. Even so, because of its proximity to the red dwarf, the planet's surface receives much more radiation than Earth's surface does. What is more, the planet has no moon to stabilize its...

From my understanding, at an elementary physics level, the height at which we can jump depends on acceleration due to gravity and the initial velocity when we leave the ground. We can calculate our initial velocity by calculating acceleration and using the distance we bend down before jumping to...

Sorry for the bad english. This might sound stupid but I am pretty new the physics and i can't seem to find what formula to use on this problem when only the mass, gravity and height of the fall is given. and i can't find a similar problem in the book, could someone give me any pointers? Thanks...

We're now familiar with the Hidden Figures within NASA's space exploration programs. Another program explores further contributions (2019). https://www.pbs.org/wgbh/americanexperience/films/chasing-moon/?feature_filter=All The Women Who Brought Us the Moon...

I have learned that the moon has rotation as well the Earth, so why we can see only one side of the moon? With the moon's rotation, at some point, we must see all sides. Can anyone explaine why it does not happens?

No, this isn't a homework question. I'm genuinely curious; If I were to magically teleport and happenstance with a shovel and survive the harsh climate, could I use said shovel? Maybe hand drills? I would assume the shovel would be a class one lever, and thus the moon's lower gravity would...

Hi! I'm fascinated by the apparent "concentration" of the four large Galilean moons in a barely 1.5 million km "strip", and the vast, "empty" distance to the next moons (moonlets?) Out of a purely aesthetic sense of horror vacui, :wink: I've always wondered if there was at least another Jovian...

A little off subject, but a few years ago I went out fishing just as the sun was rising. Perfect morning, not a cloud in the sky. The moon at this stage, was still clearly visible and both the moon and the entire sun were sharing the same sky. Which is pretty cool but what to this day makes me...

I am a newbie, and really uninformed (read stupid.) Here is my question: Would it be possible for the Earth (or any planet,) to have a moon whose orbit was such that it never came between the sun and the Earth? In other words, could we have a moon that never cast a shadow on the Earth? Or is...

dearMoon website Japanese billionaire to fly eight members of the public on SpaceX moon flight The number of spaceflight seats open to the general public (not only multimillionaires and career astronauts) just increased from 2 to 10. And it's not just orbiting Earth - it's going to the Moon...

Happy Snow Moon - whatever that is. Why? Have you noticed the plethora of "moon names" we are bombarded with - usually applied to the full moon? As an example these names are asserted to be "Native American" names for 12 months https://www.almanac.com/full-moon-names Re: the list above --...

Heard talk about He3 on the Moon and launching a fusion rocket. Is this all just a mashup of Sci-fi ideas?

Heat cannot be removed by liquid-to-gas heat exchangers since there is no substantial atmospheres on the Moon or on Mars. It cannot be dissipated by venting steam since there is a critical water shortage. It cannot be dissipated by rocks or soil since both are essentially thermal insulators. It...

Hello everyone, happy holidays! Y/day i googled that question (see title), and i found no clear answer, and I was really suprised, So I had to investigate my self, this is a super basic question, Let me know if i got this right: Earth R: 6,371 km Moon R: 1,737.1 km d1: 384,400 km (center to...

I am interested in energy flux density from the Moon at Earth’s surface, specifically in infrared (albeit most of it comes in infrared anyway). Physics.SX (boyfarrell) gives an estimate 89 mW/m². I doubt it for several reasons. 400 K (as effective mean) on Moon seems to be unrealistically hot...