Questions tagged [the-moon]

Questions regarding Earth's only natural satellite.

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12
votes
2answers
4k views

How does the Moon's gravity affect Earth's oceans despite Earth's stronger gravitational pull?

Given that Earth has a much stronger gravitational pull than the Moon, how does the Moon have any influence on Earth's oceans?
6
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1answer
64 views

Planets positions (azimuth, altitude) API

I'm looking for a simple API that will allow me to get positions of planets and the moon for a given date, location and time. Does anyone know an API like that? Any suggestions or alternatives would ...
4
votes
2answers
137 views

If the earth stopped spinning what would happen to the moon

A question was posed at work today, "if the earth stopped spinning what would happen to the moon"? Ignoring any effects on the Earth, what actually happens to the Moon? Does it continue to orbit the ...
22
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6answers
9k views

If the Moon were impacted by a suitably sized meteor, how long would it take to impact the Earth?

An answer to the question of How well would the Moon protect the Earth from a Meteor? mentions as a possibility that the Moon could get knocked into the Earth. What is the smallest change to the ...
9
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3answers
3k views

How well would the Moon protect the Earth from an Asteroid?

Would the Earth fare better if the Moon blocked the meteor, comet, rogue planet, or otherwise rather than a direct impact? At what point would the Moon's debris would be an extinction event? The ...
1
vote
2answers
85 views

Could Mercury be the creator of Earth's Moon?

Earth's Moon is thought to have been created in a glancing collision with a Mars sized planet. I've just seen an expose on Mercury which claimed Mercury: formed in the region between Earth and ...
9
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2answers
1k views

Satellite in orbit in front of and behind the Moon

Would it be possible to put a satellite into the same orbit as the Moon, but far enough ahead or behind the Moon to remain in place? Has this ever been done in practice?
2
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0answers
35 views

Speed of Moonrise relative to fixed point on ground

Due to the curvature of the earth, and the way the moon interacts with the atmosphere (especially close to the horizon), is there a known function that describes the speed of the moon relative to its ...
3
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1answer
107 views

Where asteroids disappear

Scientists claim that objects left on the Moon can lie hundreds of years in the same condition like astronaut Charles Duke family photo. Why we don't see remains of asteroids inside or around craters? ...
11
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1answer
204 views

Are all satellites thought to be the result of collisions with the planets?

The leading hypothesis for how the Moon was formed was that another object collided with the Earth, throwing off a large lump of matter which formed into the moon. Is this thought to be the case with ...
0
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3answers
185 views

Struggling to understand the phases of the moon

Source Typically this diagram is how the phases of the moon are explained but the issue is this, namely, the phases seen on the right half are not possible. All the phases should appear on the left ...
2
votes
1answer
100 views

If the moon is losing energy dragging the oceans around, why is it moving away from earth instead of falling like any other satelite would? [duplicate]

If a satellite loses energy it starts to circle lower and finally hits the atmosphere. The moon is moving like an inch a year away from the earth even though it is losing energy pulling the oceans ...
0
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0answers
21 views

Increasing distance of Moon from Earth [duplicate]

I've heard it said that the distance from the Moon to the Earth is increasing. Is it true, and if so what is causing it? (I take it that 'the distance from the Moon to the Earth' is the mean ...
18
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1answer
3k views

Apparent Ring of Craters on the Moon

I saw this picture on the BBC news website. There appears to be a ring of craters in the center of the picture, aligned in an approximate sub vertical orientation. Am I just seeing things or does ...
4
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1answer
161 views

Is the boulder on the peak of Tycho Crater the core of the impactor, or is it a random rock?

There's a strikingly visible boulder sitting right at the top of the peak complex in the center of Tycho Crater on the Moon. Is it just a coincidence that this gigantic, bright rock is sitting dead ...
1
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1answer
70 views

Moon's revolution around the Earth and it's rotation around it's axis? [duplicate]

Does Moon rotate around itself while it makes one revolution around Earth or not?
3
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1answer
115 views

Why does the moon 'peel' away from the horizon in this photograph?

The Himawari-8 geostationary weather satellite recently had a lunar intrusion into it's primary sensor (the Advance Himawari Imager, or AHI): Zooming in on the moon: I see a strange cupping (or '...
2
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3answers
175 views

How moon is visible during sun is still shining, simple explanation please! [duplicate]

Sometimes I observed there is moon on sky at noon and sun is also shining. How is this possible? I also observed dull moon is still on sky at 7:00 AM to 8:00 AM while sun is rising. My local time is ...
13
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2answers
2k views

Is it possible to do moon sighting in advance for 5 years with 100% accuracy? [duplicate]

It is Ramzan and the usual heated disagreements between clerics here in Pakistan as to the sighting of the crescent. This time the minister of Science and Technology (who is not a scientist himself ...
1
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0answers
52 views

Agena docking in First Man [closed]

In the movie, First Man Neil Armstrong and his colleague David Scott, as part of the Gemini 8 program, attempt to dock with the Agena. But it turns out to be disastrous as they go into a continuous ...
3
votes
1answer
49 views

Why does moon's highest altitude change during the year

I came across a question in which moon's highest altitude had to be calculated as seen from a certain latitude, also the month and the hour and the constellation in which moon would be in had to be ...
1
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0answers
49 views

How impermeable are the surfaces of the moon?

In the event that we want to dig into the surface of either face of the moon do we know yet if the surfaces of the moon are particularly difficult or particularly easy to dig in?
3
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1answer
59 views

Do we know the availability of any material suitable for solar cells on the moon?

Disclaimer: I have no formal training in any scientific field. Have we located any material suitable for solar panels already on the moon? Or does it appear that they would have be imported?
2
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1answer
31 views

Do we know the fluctuations and constant temperature depth of the moon?

Disclaimer: I have no formal scientific training. From what I understand, surface temperature effects on Earth extend only so far into the ground so that at a certain depth the temperature remains ...
1
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1answer
55 views

How wide is the Moon's umbra and penumbra at EM-L2?

Measuring the total width of the Moon's umbra and penumbra at EM-L2, 64,700 km, how wide would the shadow be?
3
votes
1answer
147 views

Did the Moon ever approximate a geosynchronous orbit above the early Earth?

Simulations suggest the early Moon formed about 20,000 to 30,000 km away from Earth which is less than the current geosynchronous orbit of 42,164 km. The Moon is now 384,000 km away from Earth. Does ...
1
vote
1answer
88 views

How to calculate the ground track of the Moon's position on the Earth's surface?

I would like to project the Moon's position on to the surface of the Earth, starting with its position expressed as Right Ascension in degrees. I know that the declination of the Moon corresponds to ...
1
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0answers
29 views

Do contact binaries such as Ultima Thule affect our current theories on how the Moon formed?

While I was reading about Ultima Thule, I was wondering if the discovery of contact binary objects had any effect on our current theories of how the Moon formed?
3
votes
1answer
145 views

How is this the last supermoon of 2019?

Media coverage of the "super worm equinox moon" (*eyeroll*) has stated that this is the last supermoon of 2019. Since supermoons normally happen every three or four months, how can there be big gaps? ...
22
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3answers
5k views

What (the heck) is a Super Worm Equinox Moon?

Google News feed shows me the following. What does the term "Super Worm Equinox Moon" mean and has it ever been used before this 2019 clickbait instance?
6
votes
1answer
134 views

What is the highest angle the moon ever makes above the horizon at the North Pole?

The question is in the title. I'd like to find out the maximum angle the moon ever makes above the horizon at the North Pole. By "the horizon at the North Pole," I mean the tangent plane to the earth ...
12
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3answers
4k views

Why are there no stars visible in cislunar space?

It’s very puzzling that the moon landing had no stars in the background, the ISS clips have no stars in the background. I listened to multiple astronaut interviews speak on what it looks like up in ...
2
votes
1answer
80 views

How to understand this multi-day exposure photograph of Jupiter and the Moon

This answer includes a stunning photo of the Moon and Jupiter "Trails of the Shifting Moon" by photographer Jin Lu. The caption reads: From the photographer: "I spent 4 days capturing the trail of ...
3
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1answer
53 views

Moon's path as seen from Earth

As observed from the surface of Earth: Will the moon ever repeat the same path (trajectory)? If yes, what is the period of repetition? And also will the moon cover the night sky with its path ...
4
votes
3answers
186 views

Why does the Moon appear to be flat?

There's no way around it: when I look at the full moon at night it looks like a mostly flat disc, with at most a bit convexity in the middle. Phases of moon look like a full moon seen through a cut-...
2
votes
0answers
46 views

Why is the moon drifting? Shouldn't orbital decay bring it closer? [duplicate]

I noted that the moon drifts away from Earth a few centimeters each year. However, I'm thinking that the emission of gravitational waves would deter such thing and cause the exact opposite. ...
1
vote
1answer
85 views

Why is the moon that special? Is it really a well built coincidence? [duplicate]

I find it funny that the moon is the only object in the solar system to almost perfectly fit the sun, resulting in the spectacular solar eclipses. No other object except maybe a few irregular moons ...
0
votes
1answer
215 views

Is the moon inside earth’s atmosphere? If so, what are the consequences?

Recently, a paper was published claiming that the Earth’s atmosphere extends far beyond the Moon. This has been reported on by a number of news sources and websites, including the ESA, Business ...
1
vote
1answer
119 views

How to calculate declination of Moon?

Is there any way to calculate declination of Moon for any day?I'll subtract inclination of Earth on the ecliptic from the result. I'll get Moon's the shortest angular distance from Sun. Thanks for all ...
2
votes
0answers
37 views

Definition of the light that is projected by a celestial body/luminary [closed]

I'm creating an application which will simulate the light created by sun or moon on a 3d topographic map of Earth. Something like this: Is there a word or definition for this light/light projection?
5
votes
2answers
94 views

Are there pictures from a solar eclipse of the earth taken from a moon landing unit or orbiter?

Did any moon landing vehicle or orbiter took pictures of a solar eclipse happening on the earth, i.e. the moon's shadow on the earth? (Alternatively from other spacecraft showing the whole globe). A ...
15
votes
1answer
233 views

How would the Tycho Impact have appeared from Earth?

The Tycho crater is thought to be the youngest major impact on the Moon, estimated at 108 million years ago. This puts it firmly in the reign of the dinosaurs, I find myself curious as to what our ...
6
votes
1answer
77 views

Can the moon's gravity influence be observed on the space station's orbit?

In browsing through Astronomy Stack Exchange, I came across this question about orbiting the moon (Is it possible to achieve a stable "lunarstationary" orbit around the moon?). In further ...
1
vote
3answers
211 views

the movement of the moon

I was in Cuba from January 15th to the 22nd this year and there was a quarter moon. If I use a compass to explain the orientation of the quarter moon, it started in the north position around 4 pm. By ...
2
votes
1answer
109 views

How come the Sun does not make the Moon crash on the Earth?

As the Moon loops around the Earth, on one side of the Earth it moves toward the Sun (let's call it downward side) and on the other side it moves away from the Sun (let's call it the upward side). ...
1
vote
1answer
135 views

What causes the duration of moon phases (the time the moon is visible above the horizon) to vary for an observer in the northern hemisphere?

Why does each phase of the moon stay up a different number of hours per phase, so that, for example, January’s full moon was up twice as long as the new moon? Plus every month this bulge shifts and at ...
3
votes
0answers
32 views

Why would the Chang'e-4 lander find lunar far side temp. “colder than scientists expected”, when the LRO has already been taking thermal readings?

In January, the Chinese probe lander Chang'e-4 was was announced to have found temperatures dipping lower on the far side than expected ("Chinese rover finds lunar nights 'colder than expected'" by R. ...
6
votes
2answers
168 views

Lunar phases if Earth was tidally locked to the Moon

I know that the Earth will never become tidally locked to the Moon, so this is purely hypothetical. If I understand correctly, in this hypothetical scenario an Earth day is now a lot longer at ...
1
vote
0answers
51 views

Moon equatorial coordinates

It took some effort, but in the end, I successfully calculated the geographical point of the Sun. I assumed that I could do the same for the Moon. My plan is: Find RA and declination of the Moon ...
2
votes
1answer
66 views

What would happen to the solar system if Earth's mass was removed?

This question is inspired by the "Stargate SG-1" episode "The Road Not Taken". In that story a device is used to shift the entire Earth to another dimension to defend against an attack. I'm not ...