Questions tagged [earth]

Questions regarding the planet on which humans live; the third planet from the Sun.

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Attempting to plot solar terminator using Python and Skyfield library

Problem I would like to plot the small circle defining the visible portion of Earth for an observer at position $P$ away from the Earth, on a 2D map. In the case of the Sun, this would be the solar ...
Hunter's user avatar
  • 151
5 votes
0 answers
80 views

Where will all atoms on the Earth end up when the Sun engulfs the earth?

I am curious about what will happen to all atoms on the Earth including all of our atoms after the Sun engulfs the Earth? Will they become the part of the Sun's white dwarf? Or most of them will be ...
tvd's user avatar
  • 51
1 vote
2 answers
69 views

Calculate geographical location (latitude, longitude) from horizontal and equatorial coordinates, date and UT

Lets say I found myself in the middle of nowhere with small computer with some sort of offline astrometry engine (like locally installed astrometry.net). I have some sort of mount that precisely tells ...
jlipinski's user avatar
  • 355
15 votes
1 answer
7k views

Safest Place on Earth from Falling Meteorites

Where on Earth is statistically safer if an asteroid was to break up in the Roche limit and rain meteorites effectively resetting the Earth? I would imagine that a ring of falling meteors would form ...
Justintimeforfun's user avatar
1 vote
1 answer
111 views

Voyager spacecraft distance from Earth

According with NASA JPL the earth catches up with the spacecraft because Earth is moving a lot faster than the spacecraft. Can one calculate the times when the spacecraft gets closest to Earth
dimitri33's user avatar
  • 127
1 vote
1 answer
103 views

How was the size of the earth determined 100/200/300 years ago?

How was the size of the earth determined 100/200/300 years ago? I know that by then the had better methods then the simple sticks and shadow experiment.
blademan9999's user avatar
1 vote
1 answer
76 views

calculating apogee and perigee for moon and sun

The perigee does not necessarily happen when we have a full moon, using swevents we can easily determine the moon phases. Now can we use python to determine when ...
dimitri33's user avatar
  • 127
1 vote
0 answers
65 views

Is there a specific area on the far side of the moon, directly below the L2 Lagrange point in the Earth/Moon system?

It seems like there should be, and if so I wonder how large an area it is, if it changes size over time, and if it moves or wobbles in some way. On the latst point, I imagine it would certainly wobble ...
Nick Codignotto's user avatar
-2 votes
1 answer
133 views

Earth and the Moon Question [closed]

(For the purpose of this question, I will refer to Earth's Moon as Luna to keep it separate from the general term of 'moon') I know the IAU has been hedgey about giving an official definition of what ...
user53218's user avatar
14 votes
1 answer
4k views

What does the Earth look like when viewed from Saturn?

Are there any data from spacecraft that visited that planet? How large the Earth is when viewed from that planet?
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1 vote
1 answer
153 views

Planets Named After Roman Gods, Except Earth

I’ve looked this up, but not necessarily sure the internet has the right answer. Why are the planets in our solar system named after Roman gods, except Earth, and why is only one of the nine planets ...
allthings27's user avatar
0 votes
1 answer
182 views

What is the distance between Stephenson 2-18 and Earth?

The distance between Earth and Stephenson 2-18 is 19,570 light years (1.15×10¹⁷ miles). The thing that makes this reasonable is because the Earth is in the Milky Way Galaxy and Stephenson 2-18 is in ...
Astral's user avatar
  • 11
0 votes
1 answer
204 views

Why don't scientists believe Earth's surface water came up from the mantle?

I read, periodically, that there is more water trapped in the mantle than there is in the oceans - possibly a lot more. If so, why don't any geologists believe that Earth's surface and near-surface ...
Kurt Hikes's user avatar
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2 votes
0 answers
40 views

Calendar times of equinoxes

I know that the dates and times of equinoxes are not the same every year, due to precession of the axis and perhaps other effects such as the year not containing an exact number of days. The ...
James Q. Coe's user avatar
3 votes
1 answer
146 views

Cooling the early earth

My son had this theory that the icy comets cooled the hot earth during the late heavy bombardment. What do we know about this cooling effect on the early evolution of the earth? He intended his theory ...
user442920's user avatar
1 vote
2 answers
1k views

Why isn't a month 28 days?

1 days is a rotation of earth. 1 years is an orbit of the sun. I've always beleived that one month is 1 period of the moon orbiting earth but the inconsistent distribution of days throughout the ...
Ethan's user avatar
  • 147
2 votes
1 answer
106 views

Are there any softwares which help in simulating different experiments regarding flight of aircrafts on different terrestrial planets of solar system?

I have a few experiments on aircrafts whose results I am aware of if performed on the earth's surface. However, I am searching for software(s) that can help simulate the same or other experiments on ...
Dhruv Nayak's user avatar
1 vote
1 answer
66 views

Will the Earth tidally lock to the Moon (ignoring Sun's expansion)

At some point, won't the tidal forces from the Moon be less than the ones from the Sun? Would that mean that the Moon stops moving away, or would the process still continue. Would the Earth start ...
user138890's user avatar
2 votes
3 answers
208 views

What does the rate the Moon moves away from Earth depend on?

Is it based on the distance between the Earth and Moon? Would that make the Moon move away faster or slower as time goes on?
user138890's user avatar
12 votes
1 answer
2k views

Would the Earth and Moon still have tides after the Earth tidally locks to the Moon?

Ignore the Sun's expansion. From my understanding, tidal locking happens from torque as a result of tidal bulges being offset from the line between the two planets. So when the Earth and Moon tidally ...
user138890's user avatar
14 votes
8 answers
5k views

How one can establish that the Earth is round?

I am asking this question out of curiosity. Currently, I am reading the book: A Brief History of Time. In Chapter 1, the author discusses about Aristotle's conclusions about spherical Earth. For ...
YII's user avatar
  • 279
1 vote
1 answer
99 views

How far should we be from Earth to see a half Moon while it is seen as a crescent on the Earth?

When we see a crescent Moon that means it should be seen a half Moon from another position in the sky, because the terminator line (i.e. the line that separates the bright and dark areas of the Moon) ...
Snack Exchange's user avatar
11 votes
2 answers
5k views

What would happen if Venus and Earth collided?

The first thing we would need to consider is that Earth has already been hit by a protoplanet half its size 4.5 billion years ago, meaning the Earth may have a chance of staying intact after the ...
user avatar
3 votes
0 answers
73 views

To what extent does the increased average airmass the Sun's light passes through contribute to the seasons?

The traditional explanation for the cause of seasons I have heard is that because of the angle of the axis of the Earth with respect to the ecliptic, the angle at which light rays hit the Earth's ...
Peter's user avatar
  • 31
5 votes
2 answers
141 views

Why does earthshine fade out when night comes and reappear on the next evening?

While watching the Moon in the thin-crescent phase (a few days after new Moon), I often noticed that the earthshine becomes noticeable near the end of civil twilight, and very noticeable during ...
Ruslan's user avatar
  • 897
2 votes
0 answers
112 views

If the distance from Earth to the Sun was filled with air, how loud would the sun be?

Based on this question: If there was air between the Sun and Earth, how warm would we get? Many sources state that if sound wasn't limited by matter, we would hear the Sun at around 100dB constantly, ...
dependsonmany's user avatar
-1 votes
1 answer
132 views

Whis my planetary volume formula wrong? (volume = mass/density)

I'm having trouble with this and am unsure what I'm doing wrong. Let's use Earth as an example. Earth has a mass of 5,972,168,000,000,000,000,000,000 (5.97E+27) kg and a density of 5513.4 kg/m3 or 5....
Harry Korone's user avatar
4 votes
3 answers
575 views

Is this definition of tidal locking really satisfying?

We always are hearing this: "If a moon has equal rotational and orbital periods it's tidally locked to its host planet and always one side of it will face to the planet." But what if, for ...
Snack Exchange's user avatar
1 vote
2 answers
444 views

How do the phases of Venus prove heliocentrism?

I have been doing research about the Copernican Revolution, and one of the main arguments that caused many astronomers to change their minds was Galileo's observation of all phases of Venus. The proof ...
fartgeek's user avatar
  • 131
28 votes
4 answers
6k views

Which is brighter, Mars as seen from Earth, or Earth as seen from Mars?

At their closest flyby, Earth is ‘new’ and dim from Mars, and Mars is ‘full’ from Earth and brightest as seen from Earth. When Earth is 39 degrees from the Sun then Earth is brightest as seen from ...
Mark Besser's user avatar
2 votes
1 answer
78 views

largest balanced mass objects in Earth's L4 & L5 Lagrange points?

What is the largest single-object mass that would allow two objects of equal mass to have a stable orbit, one each, in Earth's L4 and L5 Lagrange points?
JBH's user avatar
  • 552
1 vote
3 answers
792 views

why does earth have speed?

I understand that Earth has a quite big speed such as it ends up around the orbit. The sun can't really attract it till the end due to Earth's speed and earth really can't escape due to gravity, hence,...
Matt's user avatar
  • 203
1 vote
2 answers
208 views

What would the night sky look like after 200 years?

It is research for a book I am writing. The year is 2200. Assume the volume of items in orbit has increased dramatically from today’s numbers. We go to war and blowup all the satellites. Four hundred ...
Ken's user avatar
  • 27
2 votes
1 answer
94 views

Conditions on Earth when Mars was warmer, wetter & had a thicker atmosphere

To the question, What part of a star's habitable zone has the best chance of developing life?, I made the following comment: It's always intrigued me as to why some people have thought that life in ...
Fred's user avatar
  • 2,169
-3 votes
1 answer
77 views

Can the distribution of Al28 across the Earth tell us if the solar system formed from a gas cloud that collapsed itself or by a supernova explosion?

A single supernova could have collapsed a gas cloud and left Aluminium 28 on one side of the Earth . If there were many supernovae in all directions that gradually sent material to Earth then the ...
user avatar
-4 votes
2 answers
541 views

What is the chance that the Sun will not rise tomorrow?

What is the most likely natural astrophysical mechanism for the "Sun not rising tomorrow", consistent with our scientific knowledge today? Background The "sunrise problem - What is the ...
David Bailey's user avatar
0 votes
0 answers
50 views

Convert from magnetic coordinates to true coordinates

I am working with the IGRF (International Geomagnetic Reference Field) model and from a journal article found here, I am able to compute the earth's magnetic field at any point in spherical ...
mwoods's user avatar
  • 1
2 votes
1 answer
409 views

Is the solar system barycenter affecting the Earth weather?

I do not have the numbers but I guess the solar system barycenter should move much more than the Earth radius, and if that is correct then it should not be affecting the Earth's temperature. I mean, ...
Enrique's user avatar
  • 267
4 votes
1 answer
123 views

Different results for the same JPL Horizons query

On JPL Horizons website, I'm using the following query to get vector state for Earth: ...
Claudiu's user avatar
  • 73
27 votes
3 answers
5k views

Why is the solstice the first day of summer, and not the central day?

Summer in the Northern Hemisphere starts on the day of the summer solstice. This is the day that the Northern Hemisphere receives more light from the Sun, due to the Earth's tilt. To my knowledge, the ...
DaniPM93's user avatar
  • 395
1 vote
2 answers
148 views

What's the difference between perigean spring tide and proxigean spring tide? [closed]

Also, is proxigean spring tide a special case of perigean spring tide ? Are there other kinds of tides other than spring, neap, proxigean spring, and perigean spring tide ?
imdevskp's user avatar
  • 121
1 vote
2 answers
225 views

Polar day length

On Earth, are north and south polar days the same length? If not, at what latitudes north and south would they become equal? Or, what resources could I use to answer this question? I am referring to ...
Carex's user avatar
  • 19
2 votes
1 answer
469 views

Does a planets mass affect its gravitational pull? Let's say earth increased or decreased in mass could that theoretically affect gravity?

This was a random thought I had, and I can't seem to find any answers. I was thinking that if the Earth shrunk that could possibly cause an increase in ...
KaydPepto's user avatar
-4 votes
2 answers
179 views

Do humans have the capacity to blow up the entire planet earth today? [closed]

For example, if we are able to gather all the available nuclear weapons in place and target towards a weak point, say an earthquake fault line, will the entire planet be blown to bits?
Soundar Rajan's user avatar
1 vote
0 answers
65 views

What would happen if all water on earth including the oceans was placed evenly over the atmosphere of Earth? [closed]

Would that massive water body sit on top of the atmospheric bubble or would it fall to the ground? Would it rain water or fire instead? Would we see the skyes red instead of blue? What would be the ...
Lerian Acosenossa's user avatar
6 votes
3 answers
3k views

What is the apparent size of Earth from the Sun?

Heatwaves have been in the news in recent years. I found it amazing to consider that the energy from the Sun is enough to kill you, when only a tiny fraction of its radiation reaches Earth. Then I ...
albertoeda's user avatar
2 votes
2 answers
205 views

Effects of other planets on life on Earth

I've heard this often in the media, that the gas planet Jupiter has a significant effect upon life on Earth - by, the say, drawing asteroids & comets to itself, many planet-killer are destroyed as ...
Agent Smith's user avatar
2 votes
2 answers
1k views

What kind of effects would two moons have on an earthlike planet?

On Earth our moon has several effects: it generates two high and two low tides a day; it slows down the spin of the planet and stabilizes its wobble, etc. So, what possible effects could two moons, ...
CuriousExplorer's user avatar
6 votes
1 answer
283 views

Is the speed of time much slower on sun surface?

The gravity forces on Earth and Sun is different and in Interstellar, they said something like high gravity slows time. So if we say Sun is N billion years old, that must be earth time but on Sun's ...
thevikas's user avatar
  • 171
6 votes
1 answer
115 views

Earth's Collision [duplicate]

It is my understanding that the Earth is tilted because it was struck by another object about the size of Mars. According to Newton's first law, the Earth should have continued to rotate along its ...
user3123429's user avatar

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