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Questions tagged [moon]

A smaller body orbiting a larger, primary body, where the primary body is not a star.

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Delta-V of Earth to Moon mission using Moon orbit

I have read this article here and it talks about the delta-v cost of travelling to and from the Moon. Importantly it says that getting to an orbit round the Moon, and docking with a space station, and ...
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1answer
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Is there any moon without its planet?

Is there any planet without its star? Is there any moon or any planet wandering in outer space without a definite orbit? (The name moon or planet used here serves only for size and spherical shape ...
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How hot is the Moon?

The layer model assumes that the temperature of the body in space is all the same. This isn't really very accurate, as you know that it's colder at the poles than it is at the equator. For a bare rock ...
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Does water height in mixed semidiurnal tide systems change in a sinusoidal pattern between peaks?

I'm writing a bit of plotting software that takes the time of high tides and low tides and interpolated what the height should be between these times. I know that diurnal tidal systems follow a ...
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1answer
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Would a Lunar space elevator only be stable if it passes through Earth-Moon L1 or L2?

I understand that space elevators are extremely hypothetical (bordering on pure fiction), but they are supposed to be theoretically possible. My questions is about what longidtudes a lunar space ...
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In which direction is orbit around the moon easiest to achieve?

Suppose a conventional spacecraft is launched from Earth with the intention of establishing an orbit around the Moon. In the context of this question, the Earth/Moon system is viewed from far above ...
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1answer
61 views

What's keeping the Moon in its orbit when the Sun's gravity is greater? [duplicate]

Just as the title says, what's keeping the moon in its orbit around the earth while sun's gravity is greater, why doesn't it deviate and take an orbit (purely elliptical without moving around the ...
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1answer
56 views

Why does not the Moon escape from the Earth? [duplicate]

We know that Gravitational Force that is applied by the sun on the moon is greater than that by the earth on the moon. My Question is then why does not the moon escape from the earth and go towards ...
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1answer
57 views

What caused the curve in the Apollo transearth trajectory?

In reference to the below image, The thin black curved line is the Apollo 11 trans-lunar trajectory (outbound) The dark blue line is a tangent to the trajectory just after the TLI burn (as best as I ...
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Lunar angular frequency

I have this question from my teacher which quite confuses me. It asks to calculate lunar angular speed, when we know that the Moon circles Earth in 27.3 day. Why is number (27.3) significant here? ...
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4answers
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Why doesn't the moon appear yellow?

The sky is blue (I'm told) because nitrogen in the atmosphere scatters short blue wave lengths of light from the sunlight, which is also why the sun appears somewhat yellowish rather than white, as it ...
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1answer
63 views

If the moon also fall then why can the astronaut moonwalks?

imagine astronauts inside the ISS while everything are in free fall, the astronauts are floating around. Now if the moon are also in free fall then how come astronauts can perform moonwalk on the ...
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Energy from tidal waves [duplicate]

We all know that the Moon orbits around the Earth, and that this happens because the kinetic energy from the Moon is enough to "deny" Earth's gravity but not enough to escape its orbit. If I'm not ...
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23 views

Can the collision of asteroids form another moon?

In the lifetime of the earth, is it possible for sufficient collisions to occur in the asteroid belt to form a prototype moon?
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Is it possible to achieve a stable Low Lunar Orbit? [duplicate]

I have been researching on Lagrangian points, and also Low Lunar Orbits. However, following what I have read, LLO is unstable and can easily be perturbed from its orbit. On the other hand, I have also ...
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0answers
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How big a lens would you need to light a fire with moonlight? [duplicate]

Randall Munroe posted an interesting what-if in which he claims that you can't use moonlight to light a fire, because it is impossible for reflected light to raise the temperature of an object higher ...
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7answers
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Why does the full Moon appear?

I know that the full Moon appears when Sun, Moon and Earth are in a straight line, but if we consider that they are in straight line, why is the Moon illuminated? I mean to say that Earth should ...
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1answer
51 views

Does the moon rotate around the earth-moon axis?

It is well known that the moon always shows the same side to the earth. But does the orientation of this side change? I.e. does the moon rotate around the moon-earth axis?
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534 views

Buoyancy on the Moon

A body is floating partly immersed in a liquid. The body and the liquid are taken to the Moon. What will happen next? Will its immersed part come out of the liquid? Will it sink? Will it continue to ...
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3answers
201 views

Why is a bright night sky dark?

The sky in the day is colored blue because molecules in the air scatter blue light from the light of the sun. The sky during a some nights of having a full moon is very bright, as it shines the dark ...
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2answers
109 views

Increasing distance between Earth and Moon [closed]

I have a problem where a planet's rate of rotation is decreasing due to tidal effects of the moon. I know that the angular momentum of the system will be conserved. So, in order to conserve that the ...
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0answers
139 views

Distance from the center of earth to Lagrange point L1 (Earth-Moon system)

I have derived an equation for the distance from the center of earth to the L1. I have then used python to solve this equation (approximately). I have obtained a value of 326045071m (326045km). I ...
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2answers
174 views

If gravity can be disrupted by larger forces, why does the moon orbit the Earth instead of the Sun? [duplicate]

I read an thread on this site about how a larger gravitational pull can overpower a smaller gravitational pull. I took this to mind, and I started wondering why the moon orbits the Earth instead of ...
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4answers
262 views

Does escape velocity require you to cross Moon's orbit?

Escape velocity is the velocity required to project an object from an object's (here, the Earth's) surface so that it "escapes" the gravity of that object (or in our case, the Earth's gravity). Now, ...
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1answer
156 views

why do total solar eclipses vary in length?

Quoting https://www.mnn.com/earth-matters/space/blogs/why-2024-total-solar-eclipse-may-outshine-2017, For the 2017 eclipse, the duration of totality will last between 20 seconds (over Kansas City,...
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1answer
49 views

What speed should I maintain on land or in the air in order to experience the whole path of total solar eclipse?

What speed should I maintain on land or in the air in order to experience the total path of total solar eclipse? And What other factors are taken into account for calculating that speed? For e.g. ...
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1answer
105 views

Total eclipses becoming rare soon?

Given that the moon is receding from the earth and that the average angular size of the moon is approximately equal to the angular size of the sun at the moment, what is the current rate at which ...
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3answers
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How can a full moon be seen south of an observer's location?

I know this seems like a simple question, but I'm trying to debate with a flat earth theorist. I asked him to explain why can the ISS visibly be seen orbiting the Earth with the naked eye, and he put ...
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1answer
63 views

“Global” orientation of an inclined orbital plane

I'm pretty much trying to figure out, whether an inclined orbital plane rotates with its parent or not. To make my problem understandable an equivalent question would be, whether the longitude of ...
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1answer
297 views

Expanding Moon's orbit and newtonian mechanics

the 2 body problem of earth and moon is suppose to be perfectly described by Newtonian mechanics / Kepler's laws. How ever the moon's orbit is been moving away from earth in contradiction to the ...
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1answer
86 views

Someone walking on near side vs. far side of Moon - are weights different? [duplicate]

Running a thought experiment, I considered someone's weight when they were standing on the Earth with the Moon directly overhead. My initial thought was that the person weighs less because the Moon's ...
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2answers
411 views

Gravity on the surface of Io

Something about this seems a little incorrect to me but I can't quite put my finger on it. The moon closest to Jupiter is Io, with a diameter of $3650$ km and a mass of $8.93 \times 10^{22}$ kg, and ...
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1answer
184 views

Orbital pendulum (librating moon dumbell model)

Consider a moon orbiting its planet on a circular orbit. The moon is tidal locked to its planet, and has two permanent bulges, not exactly aligned with the planet. According to Newton's theory of ...
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What are ShadowBands during SolarEclipse and how can it be reproduced?

I recently got to know about different phases of a solar eclipse and its impact on Earth and its living creatures.., but one of the most interesting and not well explained phenomenon is the ...
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1answer
52 views

If Earth spun the other way, would the Moon be pulled closer by tides?

I read this answer and thought “that’s not right”. But thinking that the moon would continue to receed and the Earth torqued in the same direction (speeding up) doesn’t balance kinetic energy. I ...
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1answer
57 views

Imagine the Moon takes 5000 Years to fall on Earth, what power does it bring? Is the flux of power higher than the one received by the Sun?

Imagine the Moon takes 5000 Years to fall on Earth, what power does it bring? Is the flux of power higher than the one received by the Sun? I would like to know which formula I can use, do I need to ...
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1answer
117 views

Are neutrinos diffused or defracted by the moon?

We all know that neutrinos pass directly through things, even big things such as the earth. However it is also known that neutrinos interact with matter as a result of the Z boson or neutral current. ...
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Did moon gravitational force pulled metals and minerals higer?

Robert J. Sawyer's novel Illegal Alien states: A civilization living on a planet without a moon has much bigger trouble mining raw resources because moon's gravitational pull pulled materials ...
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6answers
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Is the Moon in a “Freefall” Around the Earth? [duplicate]

The force of gravity keeps our Moon in orbit around Earth. Is it correct to say that the Moon is in “free fall” around Earth? Why or why not? I think the answer is yes. The moon is falling towards ...
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6answers
9k views

If the moon had a mirror surface, would the earth be equally illuminated as by the sun during full moon, or would it require a different mirror shape?

Suppose the apparent diameters of the sun and the moon are exactly the same (which in fact very close to the real situation). If the moon had a perfect mirror surface, would the reflected visible ...
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1answer
43 views

Can the moons shadow be used to make a calendar?

Can I use a gnomon (similar to that used in a sundial) to cast a shadow using the light of a full moon to create a calendar? My idea was to build a gnomon and take measurements of the shadow cast by ...
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1answer
432 views

Why don't Moon collide with Earth but revolves due to gravity? [duplicate]

As we know gravitational force is a central force so due to gravitational effect they must collide with each other but why they revolve?
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2answers
66 views

If an object is dropped onto the lunar surface, what is the maximum velocity it can attain when it hits the surface?

The higher you stand above the moon, the less gravitational pull it has. And there is no air resistance to dampen the acceleration. So if you keep dropping objects at higher and higher distances ...
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1answer
2k views

Moon vs Sun size and distance 400 times

I have seen below statement, and it doesn't sound right: The Sun and Moon seem to have the same size because of this amazing coincidence: the moon is 400 times smaller than the Sun and 400 closer ...
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1answer
55 views

Would bottle flipping in lower gravity be easier?

Let's say I'm on the moon and I try to do a bottle flip. (Fill bottle 1/3 with water, flip it, and it lands on its bottom). Would it be easier to perform a bottle flip in lower gravity? My guess is ...
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2answers
59 views

Does moon's light splits in seven colours?

I clicked this pic of supermoon2016 and the light around it splitted into seven colours.was it my camera's effect or it was moon light which was scattered into seven colours.
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3answers
415 views

Why the Moon does not change its orbit from Earth to an another planet?

I know that Earths gravity pulls down the Moon towards the Earths center and Moon is falling on Earth, but because of its change in velocity it never fall on Earth but orbits around Earth. Now I don'...
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2answers
152 views

What changes about a helium-filled balloon on the surface of the moon?

In terms of air pressure, I think that the pressure inside the balloon should be equal to the air pressure outside so that it does not burst. So how will a helium-filled balloon behave on the moon in ...
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On the formation of Earth's moon

NASA states that : The moon was formed ~4.5 billion years ago, about 30–50 million years after the origin of the Solar System, out of debris thrown into orbit by a massive collision between a ...