Moon Definition and 990 Threads

i heard the moon is moving away from us, does that mean its orbital speed has increased? how will that affect the rotational speed of Earth on its axis? slower?

Just finished this... I thought i`d attempt a mosaic and the moon looked rather seductive a couple of weeks ago low in the westen sky so i htought i`d take a few picks.

I'm not sure if this has been asked before, I searched the forum but didn't find anything. Anyway, I was wondering what minimum velocity the moon can have without crashing into the Earth due to gravity (basically the opposite of the escape velocity).

not sure exactly where to put this so general discussion sounds good. Last night i was once again watchin TV flipping throguh channels so i stopped on discovery about half way through this issue. I don't remeber who this guy was i believe he used to be sumthing to do with US government and...

between the moon and the Earth a Spaceship travels. A person goes on a spacewalk and pushes the tractor trailer sized vehicle. Will the person be pushed back even though things in zero gravity have no mass?

Astronauts on the Moon can jump so high because 1) they weigh less there than they do on Earth. 2) their mass is less there than it is on Earth 3) there is no atmosphere on the Moon I believe the correct answer is 1, because they weigh less. Choice 2 has got to be wrong since mass...

On the Moon the acceleration... On the Moon the acceleration of freefall is 1.7 m s-2. How much time would it take for a featherto fall a distance of 1.0m from rest? Im not bothered about the answer i just need to know what formula(s) to use and how. These are the formulas i was given...

I am curious as to why the moon doesn't fall into the earth. Did a few searches and found: https://www.physicsforums.com/archive/t-58667_Why_doesnt_the_moon_just_fall_to_the_earth?.html But that doesn't explain one thing. Moons orbit is not an exact circle. Its "almost" circular. So...

What would be the effects of Earth not having a moon? I know that our moon is slowly drifting away. But what would happen then?

Please help me with this. Can anyone direct me to the specific mathematics that is interpreted as saying that "the Moon does not exist when nobody looks at it." Is there any book or discussion of the actual math and physics of this? What specifically was Einstein reacting to when he said: "I...

without having devistating consequences for Earth? My kids (6 and 4) came up with the question last night at bedtime and it is an interesting one. Clearly, none of the moon can contact the roughly 65 miles above Earth that includes the atmosphere, and given its size that puts a bare...

there are one man with 7 wives each wive has 7 daughter each daughter has 7 maids each maids has 7 kids each kid has 7 cat each cat has 7 cotton ball each cotton bal has 7 color All of them go to the moon how many man go to the moon ?

someone told me that in the near future we'd be able to see Mars as the size of a full moon from earth. later i read it was just a hoax. anyone else heard about this?

A recent spate of now closed threads gave me an irriisistable impulse to ask this question...

Couple of months ago there was a thread on Orange moons (but not bears), with http://home.hiwaay.net/~krcool/Astro/moon/moonorange/ website showing a ..giant moon. Does anyone know where in the world i can see such large moons?

Hi everyone, sorry if I'm new to this and this subject have already been posted, but i have a test tomorrow, and i need help. The question is that when the sun, the moon, and the Earth are in a straight line, with the moon is in between the sun and the earth. It is reasonable to think that the...

I don't really know where this should go its more about the people ON Earth then it is about Earth itself so I suppose it can go in this thread Anyways my question is: Do you think we'll be able to colonize places like the moon? What do you think would be the problems with doing that...

Hi all, I am reviewing for my final and cannot seem to find how to solve the following If the tides on Earth one meter high how far away is the moon? What equations should I use to calulate how the moon effects the tides on earth?

I was given the equation for the period of oscillation thought a tunnel:T=2 \pi \sqrt{\frac{R_E^3}{GM_E}} then asked how I could transform that into T=2 \pi \sqrt{\frac{R_E}{g}} which I did through the idea that g=\frac{GM_E}{R_E^2} The the question asked what would be the period if...

I've seen this mentioned on another post but some questions remain, the Earth rotates about it's axis as I understand it and the moon rotates about the Earth every 28 ish days, the moon has no axis rotation so we only see one side of the moon, is that right? This I can grasp, however why...

How much work is done by the moon's gravitational field as a 1000kg meteor comes from outer space and impacts the moon's surface? all I have to do is: U=-\frac{Gm_1m_2}{r} where _{m_1} is the mass of the moon, _{m_2} is the mass of the meteor, and _{r} is the radius of the moon. is that...

Q.Suppose the moon were held in its orbit not by gravity but by the tension in a massless cable. You are given that the period of the moon's orbit is T = 27.3 days, the mean distance from the Earth to the moon is R = 3.85 x 108 m, and the mass of the moon is M = 7.35 x 1022 kg...

Morning everyone! I was up late a few nights ago and I noticed how large the moon looked in the sky. Being a creature of habit myself, I began to wonder why the moon controls the ocean tides. I've been thinking about it and I couldn't come up with an answer. The moon controls the tides. Thats...

I hear that the moon is steadily moving away from the earth. Is it due to the suns gravity? Will it eventually go out of Earth orbit and circle the sun on its own? Would there be any chance of a posssible collision with Earth if this happened or would it leave Earth orbit at its closest...

So what causes the moon to be orange? I saw one such display about an hour ago going to get food and i was like "aww... big cheese wheel... I am going to eat the moon". So what cuases that?

No Moon :( What would happen to the Earth if suddenly Moon was gone?Except no more tides I can not think of something else.

My astronomy book tried saying that the moon is spinning into outer space, away from earth,; it was blamed on tidal effects between the Earth and moon and the subsequent generation of frictional forces. I don't see it. Also, from physics, if you look at a force diagram there should only be...

If an astronaut is located close to the positional median between the Earth and its moon, will the astronaut float around as if it was not being effected by gravity for the same reason that a person in an elevator in free fall would float around being unable to use a measuring device to...

I was wondering if there is a site that shows the moon phases for my specific location up to 20-30 days old. I need to know how much of the moon was showing that day, and idealy the part of sky it was in (high or low to horizon) and the weather conditions for that day (e.g. cloudy, clear, etc.)...

hey...heres a question that's been bugging me "The Earth and the moon attract each other with a gravitational force. How does the force acting on the more massive Earth compare to the force acting on the moon?" Choices: a.) there is a greater force acting on the earth. b.)the same force is...

Our moon does not turn ?? Not at all ?? One would think that after a milenia of being bombarded by comet debris and asteroids that they would have nudged it a little..? couldnt we spin it ourselves .? I for one am tired of looking at the same view of the moon ,every full moon same...

1)If our moon did not exist in the precise configuration it has now would intelligent life have failed to evolve on earth? (There might have been slight differences but I feel the absence of a moon would not have prevented intelligent life evolving on this earth.) 2)The Anthrorpic...

hi everyone :D i have two questions i have no idea what to do (teacher assigned them after watching a video, though i have no idea still what the video is talking about).. the questions is: 1. Would gravity waves in water be faster or slower on the moon? Explain. i would think that it's...

I'm an undergraduate physics major and I want to create an experiment where I measure the difference in gravity between sunrise, noon, sunset, and midnight (and everything in between for that matter) due to the tidal effect from the moon and sun. I did some calculations and I expect the...

I was thinking about why the shuttle can only orbit earth. Why can't it go to the moon once in awhile and orbit that? How much more extra fuel would it really take to get there?

I know its in orbit but things like the Hubble telescope need fuel don't they?

Hi ! first, excuse my english, I'm just a poor french student... and we are so bad in languages here... anyway.. I'm trying to make a little program which could calculate the motion (and some other little things) of n bodies linked with gravitationnal interaction. (my final aim will be to...

What would be the best way to capture this asteroind and place it in a orbit about the Earth? It would be better to capture and study it then to just redirect it or destroy it. Imagine Earth with two Moons. http://www.space.com/scienceastronomy/asteroid_update_041227.html

If I shine a torch at the moon the light will after a time be seen on the surface. If I then swing the torch so as to move across the moon does the spot of light on the surface travel faster than c?

If the moon ever did enter our atmosphere, what would be the first thing that would happen? How would the two gravitational fields interact with each other?

Is helium a better alternative then the current proposed fuels for fusion reactors? http://www.space.com/scienceastronomy/helium3_000630.html http://www.asi.org/adb/02/09/he3-intro.html

Here is a problem, please let me know whether my answer is right or wrong. Locate the position of a spaceship on the Earth-Moon center line such that the tug of each celestial body exerts on it would cancel and the craft would literally be weightless. I found two equations: A...

11/23 10:41. the moon is shining through a circular opening in the clouds or something. seriously, the opening is a perfect circle. it is the weirdest thing!go look at it! what the heck?

Two different simple harmonic oscillators have the same natural frequency (f=2.80 Hz) when they are on the surface of the Earth. The first oscillator is a vertical spring and mass, the second is a pendulum. If both systems are moved to the surface of the moon (g=1.67 m/s2), what is the new...

A solar sail is orbitting the earth. It needs to get to the moon by increasing its orbit energy through solar propulsion. How many orbits will it need to make and how long will it this take? Considering it starts in a Geostationary Transfer Orbit and has an acceleration of 0.5 mm/sec2.

Ive sure everyones seen these in there life or at least has an idea what I am talking about. The problem is your on the moon and only have these 15 items to survive, and you are supposed to organize the list from 1-15 in order of importance. The items are... *Box of matches *Food concentrate...

The Rotation of the Moon Today’s astronomers explain the Moon’s rotation about its axis with one side visible to Earth. The theory states, the moon spins on its north-south axis in harmony with its orbital velocity around the Earth. This revolution or slow spin of the axis of the Moon...

problem: The mass of the Earth is 5.98E+24 kg and its radius is 6370 km. The radius of the moon is 1738 km. The acceleration due to gravity at the surface of the moon is 1.62 m/s2. What is the ratio of the average density of the moon to that of the earth? (no units) I am very confused as...

I could swear i have, although when i started thinking about it could happen i got confused. You can probably tell I'm a newbie as there must be some really simple explanation to this problem. It might be a bit hard to explain without a diagram, but imagine a metaphorical one with the Sun on...

Man went to the moon with only Newton's equations? I am keenly interested in seeing these equations. Anyone recommend a book or resource that details this?