Moon Definition and 1000 Threads

Lets say Earth as a moon of a gas giant. Let's say it orbited the gas giant the size of Saturn every 24 hours. I understand that the part facing away from the gas giant would have a day/night cycle like the planet Earth but what about the side facing the gas giant? Would it get any sunlight...

From what i understand Io is extreamly active on geologically. So does it also produce plate tectonics?

The L4 position is stable in the Earth Moon and I perturbing a satellite by km in the x direction to see the trajectory over the course of the year. However, the satellite isn't moving. Can anyone see if there is something wrong? I gave the satellite no initial velocity. In[2587]:=...

v,escape = (2*mu/r)^(1/2), where mu = G*M. What I'm asking is if this page is wrong about calculating the escape velocity for the moon. They seem to have the equation wrong (missing 2 in front of mu = G*M,moon).

Hi! I'm trying to help my 5th grader with her science fair project - she's comparing how a trampoline would work on Earth vs. the moon. The trick is in the force of the jump I think - what the jumper herself puts into it. The larger the downward force she exerts on the mat the higher she...

http://news.discovery.com/space/asteroids-meteors-meteorites/lets-put-an-asteroid-into-lunar-orbit-130111.htm Basically, wouldn't any object that orbited around the moon gradually see its orbit be made more and more eliptical until it crashed into the moon itself? Also, it actually takes...

ello, there is a knowledge that above Earth's magnetosphere cosmic radiation is extremely high and unsafe for human life. the lowest point of Earth's magnetosphere is 70.000 km, the range between Earth and moon equals ~380.000 km, we know that moon doesn't have own magnetic field. So my...

This appeal is addressed to all the ones that have the grasp of secrets of the universe at heart and want to work on to lay the foundations of human space exploration. The mankind has a barrier to overcome and a no limits horizon to discover. The billions of stars, the galaxies, the...

Hi, A quick clarification question. Is epicyclic a correct description for our moons path around the sun. I can only find references to epicycles in a historical context. Thanks.

My girlfriend and I want to have a Moonlight rendezvous where we can both see the moon at night at the same time. I'm in Oregon, she's in Brazil. Is it possible?

Homework Statement The mass of the Moon is 7.35*10^22kg. At some point between the Earth and the Moon, the force of gravitational attraction cancels out. Calculate where this will occur, relative to Earth. Me = 5.98*10^24 kg Mm = 7.35*10^22 kg D = 3.84*10^8 m g = 6.67*10^-11 Nm^2/kg^2...

hi, i can calculate the distance of moon from the Earth and its diameter - but i could't get the formula by which i can calculate the mass of the moon - although i can calculate the mass of the moon by assuming it has same average density that of Earth -

Homework Statement A pendulum clock that keeps correct time on the Earth is taken to the moon. It will run a) at correct rate b)6 times faster c)√6 times faster d)√6 times slower Homework Equations The Attempt at a Solution T_{earth} = 2\pi \sqrt{\dfrac{L}{g}} \\ T_{moon} = 2\pi...

I would like to know a function or at least an approach toward developing a function that describes the change of gravity on the Earth's surface due to the sun, moon and if possible, the tides. I am quite familiar with the fundamentals but my math isn't up to this. Thanks in advance...

please don't mention the word centripetal or use the (misguided) rock-on-a-string analogy. clue: there is no "balance of forces" in a similar vein - please answer the following orbital skills question ... were the planet Saturn to stop rotating about it's axis - what would happen (if...

Consider a moon that is 1.15 x 10^6 km from the planet it is orbiting... Homework Statement Consider a moon that is 1.15 x 10^6 km from the planet it is orbiting. This moon makes one complete orbit every 27 days. What is the orbital period of a satellite orbiting the planet at a distance of...

So let's consider the moon its rotating around the Earth in a fixed orbit, its moving at a velocity say v so it possesses a kinetic energy 1/2 mv2 . the gravitational force between the Earth and the moon is also present which attracts the moon towards the Earth . My question is does the moon has...

Hi, I am doing research for a story and would like to set it on a habitable moon in orbit around a gas giant. I've done a bit of research on this and understand that the moon would likely be tidally locked, so that only one face of the Moon would ever face the gas giant. I understand that...

Assume that the average distance of the sun from the Earth is 400 times the average distance of the moon from the earth. Now consider a total eclipse of the sun and state conclusions that can be drawn about: A. The relation between the sun's diameter and the moon's diameter. B. The relative...

Hey folks, A couple of weeks ago I took a photo of the moon, not sure if you will be able to see this in the image, but if you zoom in a bit after downloading it, you can see what I think are stars all over the background... ...The reason I say think is that I can see them through the...

Hey guys, I was doing some homework and found something I don't quite understand. When calculating the absolute magnitude of the Full Moon, I came across a square root of its Albedo. (here - http://space.wikia.com/wiki/Absolute_magnitude). No idea why it's squared, but I can't get the +0,25...

Homework Statement The Moon is about 4x10^8 m from the Earth and has a diameter of about 3.2x10^6 m. You want a radar which just covers the Moon with the central spot of its diffraction pattern. If the radar has a wavelength of 16.5cm , what is the diameter of the radar antenna? Homework...

Sorry I know this may seem banal but it's really bugging me. I'm making space scenes of made up solar systems in a 3d modelling program and I want to name one "a ~ transit". If it was a generic planet, I could call it a planetary transit, or if it was OUR moon, I could call it a Lunar...

So I got to see an amazing Moon Halo the other night. My question is, what is really the diameter of the average location in the halo, where the light is bent by ice crystals? Is it really as easy as doing the trig with the altitude to your average cirrus cloud, the angle above the horizon...

Homework Statement where does the gravity cancel out between the Earth and moon?Homework Equations s=3.84405x10^8m earth m = 5.98x10^24kg moon m =7.35x10^22kg G = 6.67x10^-11N m^2/kg^2 mass of object between = 1kg for simplicity F = G x m / r^2 r = ? F Earth = F moon G x Earth / r^2 = G x moon...

At least, that's what one individual would have us think: So at what point did the education system really go wrong?

Please see attatchment for qs. I really need help with number two mostly.

This WILL sound sketchy and far-fetched, but read every bit of information carefully, and you will hopefully understand, I know overall the reason why the objects fall together at the same rate is because there is no air-resistance, but working with formulas it shows how some things are...

If the Earth still rotated and stayed on its course around the sun, but the moon was orbiting in the opposite direction. What would be the consequences, and would you actually be able to see the Moon moving with the naked eye, would the effects of the Moon moving in the opposite direction of the...

Homework Statement A rocket on its way to the moon passes through point P (along the line connecting the Earth and the moon) where the gravitational pull by the moon is exactly equal to the gravitational pull by the earth. Neglect the motions of the moon and the Earth and find the...

Homework Statement You plan to take a trip to the moon. Since you do not have a traditional spaceship with rockets, you will need to leave the Earth with enough speed to make it to the moon. Some information that will help during this problem: mass of Earth = 5.9742 x 10^24 kg radius of...

Homework Statement If one micrometeorite (a sphere with a diameter of 1.50×10-6 m) strikes each square meter of the surface of the Moon each second (1 micrometeorite/m2/s), how many years will it take to cover the Moon to a depth of 1.80 m? Assume that after impact, the micrometeorites...

I was just wondering how high tides occur and happen to read the wiki article at http://en.wikipedia.org/wiki/Tide but I am bit confused like if the moon caused the tide then why there should be a high tide on the opposite side of the Earth also. The figure in the article is just confusing and I...

Ocean tides are considered to be mostly caused by the force of gravity from the Moon. Tides are presumably caused by the difference of the force applied on the "front" and on the "back"of the Earth. Meaning, gravity from the Moon cause Earth's shape to become elliptical in the plane of the moon...

ok, so I guess this is supposed to be really easy, but I just can not seem to get my head wrapped around this... I have a homework question that goes like this. Here is the link to it: http://www.apsu.edu/sites/apsu.edu/f...5_Solution.pdf If the link dosent work, it asks:In each figure...

So I've read that super Earth's masses 2-10 can be habitable hold thick atmosphere and generate plate tectonics. So I am wondering the absolute minimum mass an exoplanet or moon can be to stay habitable in the liquid H2O zone? I guess these would be called subEarth's.

What would happen to the Earth's momentum theoretically speaking if the moon was destroyed by some outside body such as a asteroid ?

My educated guess is that you can see the sun if you were standing on the moon. Having said that, why isn't there any pictures of the sun taken by astronauts who've "supposedly" walked on the moon..? This seems odd to me.

I read somewhere that Earth's moon is a cause for Earth's relativly thin atmosphere, is that true. If so would that mean if the moon was smaller we would have a thicker atmosphere?

According to an article I read, http://www.badastronomy.com/bad/misc/tides.html the Earth will one day become tidally locked to the moon the way the moon is locked to the Earth today, so that the same face of the Earth always faces the moon. If this is true, how long will that process take?

Hi, I made a (rough) calculation of how far the Moon would be moving away from Earth according to Hubble's law = 72.6 (km/s)/Mpc -- 1 megaParsec = 3.08 × 1022 m ≈ 4 × 1022 m Distance between Moon and Earth ≈ 4 x 108 m Expansion rate ≈ 7.2 104 (m/s)/4 × 1022 m = 7.2 (m/s)/4 × 1018...

This is a question I have been pondering for quite some time. I haven't done much research on the matter but I can't find any theories, hypotheses, or explanations of this matter. So I calculate that the best route to take would be to ask those who know about the topic better than myself. I am a...

Homework Statement The mass of the moon is 7.35x10^22 kg. At some point between Earth and the Moon, the force of Earth's gravitational attraction on an object is canceled by the Moon's force of gravitational attraction. If the distance between the Earth and the moon (center to center) is...

http://s579.photobucket.com/albums/ss234/theranker24/Night%20Sky/ can someone look at them two photos i have linked on photobucket and tell me what it is that I am seeing. and

First post, long time lurker. Supposing that mankind were to first choose the Moon as the celestial body for colonisation (no questions at this point, those in favour of Mars pretend for a second it has some sort of life on it!), how would we go about creating a significant atmosphere on the...

I looked up at the moon with several friends and family members and the moon would gradually get brighter for 30 seconds. It would stay bright for a couple minutes and then dim down also large dark spots randomly appeared on the visible part of the moon. I did some research and read that this...

If the moon was vapourised, would it first recondense or get blown away by solar wind?

Problem: One of the asteroids, Ida, looks like an elongated potato. Surprisingly it has a tiny (compared to Ida) spherical moon! This moon called Dactyl has a mass of 4.20x1016kg, and a radius of 1.57x104 meters, according to Wikipedia. Solve: - Find the acceleration of gravity on the...

Is there any chance the New Horizons probe could collide with an unseen or unknown object while making its flyby? I would assume the odds are astronmical, but if such a small body such as pluto has 5 moons, smaller icy bodies might be more frequent/common than we expected? Does anyone know if...

What is between our planet and the moon? Space without air? Is it just black emptiness?. Thank you.