Moon Definition and 1000 Threads

I've read on PF that you can't shoot something, like from a big gun, into Earth orbit; it will either fall back to Earth or attain escape velocity and be gone forever. Instead, you need a separate rocket burn to insert the object into orbit following launch. Makes good sense to me. So we are...

I am doing a project about the earth, the sun, and the moon. My question is why does the moon rotate around the earth?

Hello According to general theory is there any explanation of tidal wave in sea due to gravitation of moon. How moon warp space time in such a way so that tidal waves are generated in sea?

Hi all! I've just finished writing a program in python that determines the position of a rocket in the Earth moon system. Initially it is in circular orbit around the Earth and then it is given a velocity boost at some point in it's orbit to make it travel to the moon. I started all 3 bodies...

Homework Statement An observer on the Earth observes the angle subtended by the diameter of the moon to be 0.009199 radians. If the moon is 234,800 miles away, what is its diameter? Homework Equations Egrav= -Gm1m2/r 57 rad=1 deg The Attempt at a Solution Alright this one is really...

Homework Statement Mass of the Moon is nearly less in 100 times than Earth's, and the diametr is less in 4 times. Find the acceleration of free falling at the Moon. Homework Equations F = G×((M×m)/R²) g = 9.8N The Attempt at a Solution M_moon = M_earth / 100 D_moon = D_earth / 4...

I've been looking into meteorite impacts and large meteoroids passing by the Earth, and I started thinking about the physics of all that. And in the course of my playing around with the numbers, I found something that can't possibly be right, but I'm not sure what I'm doing wrong. Put simply...

I have been reading and listening to discussions on origins and again today heard a scientist advance the idea that a meteor collided with the Earth and the collision resulted in the Moon being ejected and finding its way to its current orbit. Is this plausible? Would it not be the same...

Something that has bothered me for a long time, if tides are due to the gravitational force of attraction of the moon, and clearly the moon transverses the sky once a day then there should only be one high tide a day not two. If the second high tide is due to the attraction of the sun then I...

Hello :-) I'am trying to figure out how to describe a trajectory of an object as a function of time. The object is a spacecraft and it sets of from Earth, travels around the moon, and then heads back to Earth...

I feel as though I have a good understanding of the movements of the moon, sun, planets and any other bodies out there, but there is still one thing that has been giving me trouble. My problem is finding out the phase of the moon given its position and the suns position in the sky. Can someone...

The problem I am struggling with is this . . The centre of the Earth-Moon system is 4.7x10^3 km from the centre of the earth. Calculate; i.the ratio of the mass of the Earth with the mass of the moon. ii.The acceleration of free fall on the Moon's surface. Constants Distance between...

Let's face it: it would be a lot cheaper to go to the moon. How does the value of going there compare to the value of going to mars? Anyone pitch in...

why does the moon appear to glow from our view on earth? what causes the illumination?

This is a bit of a silly question, but one I'm curious about ... It all started when I made a status update on facebook proclaiming that if you could fold a piece of A4 paper in half 44 times it would reach the moon. One of the commenters made an interesting point by saying: I...

Homework Statement During a solar eclipse, the Moon, the Earth, and the Sun all lie on the same line, with the Moon between the Earth and the Sun. (a) What force is exerted by the sun on the moon? (b) What force is exerted by the Earth on the Moon? (c) What force is exerted by the sun on the...

[b]1. If a man weighs 900 N on Earth what would his mass on the moon be? Gravity on the moon is 1/6 the gravity on the Earth. (use 9.8 m/s^2) [b]2. F=ma [b]3. 900=m(9.8) m=91.83 ans=91.83 I'm fairly certain that this is correct, i just want a little...

I am kind of new to astronomy and I have a few questions.. I need to be able to determine an equation expressing the elliptical orbit of Oberon around Uranus. I have four nights of data showing Oberon in different positions relative to Uranus. I am able to calculate the RA and Dec for both...

Homework Statement What are the acceleration of the cannon and the g-forces experienced if there was a guy on it... Cannon is 215m long Velocity is 1.66x10^4 ms^-2Homework Equations V2=u2 + 2ay The Attempt at a Solution (1.66x104)^2=0 + 2xax215 a = (1.66x104)[SUP]^2/2x215Ok... So i think...

Is it possible that...(re: Earth and moon) (This is regarding how the moon became apart of our orbit) Is it not possible that insted of the moon simply crashing into the earth, giving us some of its mass, and the rest just drifts off, gathers and gets caught in our orbit...could it not of...

Hello, My Question is: What is speed of moon relative to Earth without the gravitational pull of the sun and hence the isolated length of the lunar orbit? :wink: Thank you.

Gliese 581 g, assuming it's real, is supposedly tidally locked being so close to its parent star. That makes sense. It also means it is probably not a very habitable planet - one side being a burnt desert and the other a frozen wasteland, with only the margins capable of supporting life...

Is it mathematically feasible that the moon is hollow? Many people say that the moon has been hollowed out, and even the astronauts who have visited have also said that the moon 'rings' like a bell, suggesting it is hollow. Mathematically, is it possible that the moon is indeed hollowed...

I may be wrong, and I will feel pretty stupid if i am, but i think that we can see Earth's shadown on the moon, that's why it has cycles right? if so, then why can't we see mountains and stuff from certain places on the earth. Is it because the moon is so far away?

They actually did find some small amount of water in the Lcross ejecta plume. http://www.sciencemag.org/cgi/content/abstract/330/6003/463 Science magazine 22 October. You remember they crashed junk into an everdark crater at the moon's south pole and studied the resulting cloud of debris. The...

Is the Moon’s orbit more or less elliptical than the Earth’s? How does this affect the range of angular sizes for the Moon vs. the Sun? I always thought smaller objects are less elliptical than larger objets, so the moon would be less elliptical Can someone clarify? Thanks!

Ok, here is the problem I have: Figure 2 shows the Moon in its orbit about the Earth, as viewed from space high above the North Pole. Copy the figure into your lab book and for each position A − E shade the appropriate portion of the Moon’s surface as viewed from space, NOT as viewed from...

Which of these 3 sports will be the hardest or the easiest to play on the moon? Basketball, Soccer or Football? I personally think Football would be the hardest and Baseball the easiest but what do you think?

I have a question for someone who may know a bit more about the calculations involved in this process. Let's say for instance you are standing on Earth and somehow fly off the ground and go straight to the moon. Throughout the flight you will be experiencing different forces of gravity pulling...

This is all theoretical of course. I would like to pt together a small presentation on what it would take to get an object to the moon. For the sake of argument, we will say the object weighs 10 pounds. The shape can be determined by the most efficient shape given the method of propulsion etc...

this a creationist question. i am not a creationist but a creationist friend asked me this question. didn't have the answer. the moon is moving away from us at a rate. billions of years ago at that same rate the moon would have been "touching us"? don't know the answer.. was the moon always...

question why does the moon move around the Earth why it doesn't hit the Earth under the effect of gravity??

I was out observing tonight with my Orion Skyquest 8" Dobsonian. I was observing the moon, when I happened to notice a string of satellites transiting the moon. It is not abnormal for me to observe satellites in Earth orbit that transit the moon with my scope but it is usually one at a time. I...

Ok, this might seem like a silly question, but I just want to get it straight. Just tell me if anything I am saying is wrong, and answer the best you can. Ok, the moon has no air, because it has no atmosphere correct? And the reason for no atmosphere is because the moon is biologically...

Solved:Trip to the moon 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: mearth = 5.9742 x...

Are there any satellite around the Moon on geostationary orbit?

**Quick angular measurement question about moon. Thanks! I am suppose to write a calculation on finding angular measurement of the moon. Does the following make sense, and is correct?

I have a plan for the private colonization of the moon. My plan includes 5 aerospace companies they are 1.SpaceX 2.Bigelow aerospace 3.Virgin galactic or Reaction Engines Limited 4.Armadillo aerospace 5.Ad Astra Rocket company First SpaceX launches the Sundancer Inflatable habitation module...

Hi everyone... i have to design the frame of a moon buggy, which is a manually powered vehichle for 2... it is somewhat similar to the frame of FSAE cars... but the problem is... i don't know from where to start... i have ideas... but to design a proper frame... i need some study material...

On August 27 we are supposed to see Mars adjacent to the Moon about 1 - 2 AM so it looks like this picture. Doesn't make sense. Mars is 37 million miles away while the moon is 1/4 million miles away. That makes the subtended arcs in a 75:1 ratio Moon:Mars (because Mars is twice the diameter...

By watching a few moon landing videos on YouTube, i realized that the gravity on the Moon is not just weaker but act in totally different manner than gravity on Earth. This is one of many videos that shows the anomaly...What is wrong with this picture? link:

On July 20, 1969 American astronauts Neil Armstrong and Buzz Aldrin became the first men to set foot on the moon, also being the first men to ever land and set foot on another celestial body. To this day 41 years later, the Apollo program stands alone in: Sending humans beyond low Earth orbit...

Surgeries in Full Moon and New Moon! Hey Everybody, this is a Question that has been on my mind for so many years, i have a lot...a LOT of Friends whom are doctors (medics), surgeons specifically, and they don't know the other ones...i mean, i`ve known them through my nomadic living in several...

Hy. I want to find a lot of info about the moon. I've read about gravity. I want to know about the frequencies, radiations and whatever there is, and how them interact with earth. Where should i search? Thanks!

Suppose that Nolan Ryan stands on the surface of the moon and throws a baseball horizontally. If the baseball has a high enough speed and does not strike any mountain, it can orbit around the moon and, after completing the orbit, strike Nolan from behind. The mass of the moon is mm =...

Yay, I'm in central US. http://news.yahoo.com/s/space/20100625/sc_space/moonillusiontosupersizesaturdaylunareclipse

Homework Statement The moon is observed using a telescope that has an objective lens with a focal length of 3.0 m and an eyepiece with a focal length of 7.5 cm. What is the angular diameter of the moon if the earth-moon distance is 3.85 × 108 m and the diameter of the moon is 3.48 × 106 m...

I was staring at the moon last night and noticed that as the clouds passed next to the moon a ring of color would surround the moon. The inner ring (closest to the moon) was blue. The middle ring looked yellow. And the outer ring looked red. It looked so cool! But i have no idea why this was...

I was recently thinking of a way to get to colonize Mars and the moon and provide cheap travel between them, after building space infrastructure. First we put a von braun station in an eccentric orbit around the earth, Then when the station is closest to Earth we take SSTO spaceplane and dock...

Hi. I was just reading a thread on the distance of the moon from the Earth on another thread, and it reminded me of a converstion with a guy a long time ago, that I haven't had resolved - even in my own mind. This guy was a 'moon landing hoax' type. I was pointing out to him the absolute...