Questions tagged [earth]
Questions regarding the planet on which humans live; the third planet from the Sun.
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Why the Earth revolves? [duplicate]
Why do the Earth or any other planet continue to revolve around the sun or a star in general and that also with constant time period? What is the reason behind it? Other than gravitational force is ...
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How stable are Lissajous orbits?
Now that the Gaia Space Telescope is on it's way to the Sun-Earth L2 Lagrangian point (SEL2), I start wondering about the stability of Gaia's orbit there. The Planck Telescope is already there, as was ...
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Why don't we have 2 Summers and 2 Winters?
Due to Earth's elliptical orbit, its distance from Sun varies by almost 5 million Kilometers (147 million Kilometers at closest point & 152 million Kilometers at farthest point, i.e. almost 3% of ...
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How can the Earth's rotation speed up? [closed]
It is known as a fact that Earth's rotation is slowing every year, that's why we sometimes have 61 seconds long minutes.
In the Java documentation of Time : http://docs.oracle.com/javase/7/docs/api/...
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Is there a pattern between the mass of a body and the mass of orbiting objects around it?
I was looking at Wikipedia's Solar system page, and it says that Sun represents 99.86% of the whole solar system mass. I found that pretty huge.
So i calculated ratio of masses : Earth / (Earth + ...
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How do people measure the distance between the Earth and The Moon?
How do people measure the distance between the Earth and The Moon?
What methods were used? Where can I find the official data?
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Could any known, living organisms on Earth survive on Mars?
No life has been discovered outside of Earth (yet?), but do we know if anything that would be considered "living" on Earth could conquer Mars? (or maybe Venus?)
With the Mars One project on the way, ...
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Could Venus be a source of Earth's apparent overabundance of water?
I've watched documentaries about the solar system, where it is suggested that Venus once had oceans of liquid water similar to those that cover most of Earth today. Venus is now in a period of ...
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What is the distance that the Moon travels during one orbit around the Earth?
Also, does it always take the same amount of time, or does it fractionally differ on each revolution?
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What effect does the Earth's rotation have on plate tectonics? [closed]
I've been reading up on plate tectonics and found that there are several different driving forces involved. One of the main categories of driving force mentioned on Wikipedia is forces related to the ...
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How would Earth's climate differ if it's axis were tilted around 90 degrees like Uranus? [closed]
As the title states, what would the effect on Earth's climate be if it's axis were tilted approximately 90 degrees like Uranus?
I'm specifically wondering about the effects on seasons, temperature, ...
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Changes to Earth's orbit
Any time a spacecraft comes in close proximity to a planet and if the spacecraft has the right angle then it is able to use the planet's velocity to move itself further into space.
According to ...
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How much of an effect does the moon have on Earth's liquid mantle?
The gravitational pull of the moon is enough to create tidal forces of large bodies of liquid, i.e the sea.
I was having a conversation the other day about how to terraform Mars, and someone ...
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Why is the Earth's center still hot after millions of years? [closed]
Why didn't the center of the earth cool after millions or billions of years? What keeps it hot?
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Day and night temperature on an earthlike planet with longer rotational period [closed]
I'm trying to understand the climatic effects of the far future scenario of an Earth-like planet with a reduced rotational speed caused by tidal locking with the moon (day-night period of 28 days, one ...
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Does the Moon's magnetic field affect Earth's magnetic field?
I wanted to ask a question; it's simple but I cannot find any possible and perfect solution.
Earth has poles, North and South. By which we can get directions using a compass or a needle compass, but ...
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Were effects of a planetary magnetic field reversal observed on other planets than Earth?
From geological records in rocks and minerals we know that the magnetic field of Earth changed its polarity multiple times in the history. See Geomagnetic reversal.
Was a similar process of a ...
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Why does the Earth have a tilt of ~23°?
Is there a reason that the Earth has the tilt that it does (~23°)?
How do we know which way is supposed to be 0°?
Does this tilt have major consequences on the planet?
Has it changed and will it ...
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How often does Earth cross the galaxy regions with higher supernovae activity?
According to Summa Technologiae, a book by a Polish author Stanisław Lem that based his science fiction novels on scientific research of the era, the Earth crossed in the moment of forming of life the ...
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Earth and ferromagnetism [closed]
Earth's core is a giant liquid iron ball actually. If I know well, the magnetic field of our planet (that protects the surface from some particles comes from the Sun) can exist because as Earth ...
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Why isn't Earth a perfect sphere? [closed]
In general, almost everyone describes Earth as an perfect sphere, but in reality it isn't a perfect sphere.
Is there any specific reason why Earth is not perfect sphere ?
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Why is the Moon receding from the Earth due to tides? Is this typical for other moons?
After reading the Q&A Is the moon moving further away from Earth and closer to the Sun? Why? about the tides transferring energy to the Moon and pushing it from Earth, I have a question:
How is ...
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Why does Mars appear to retreat across the sky?
If you plot the movement of Mars across the Earth's sky it appears to move back on itself during its orbit.
Why does it appear to have a loop shape from Earth?
user96
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If the moon wasn't receding from Earth, what would be the impact on the weather and tides?
Moon is slowly receding from Earth, which means that after its formation it was much closer to the Earth than now. How would weather look like if it wasn't receding at it would be now as close as at ...
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What is the current theory for the formation of the Earth's Moon?
Given that the Earth and Moon are often said in the literature to have very similar geochemistry, what is the current theory as to how the Earth's Moon formed?
user8
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Why do stars appear to twinkle?
Sometimes at night you will look up to the stars and they will appear to twinkle, getting brighter and darker in bursts.
Why does this happen? Is this because of our atmosphere? Would they twinkle ...
user96
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Do other planets in our solar system experience eclipses or is this unique to Earth?
Here on Earth we get to experience lunar and solar eclipses. Is this pure coincidence that everything happens to line up?
Do other planets in the solar system experience this phenomenon or is this ...
user96
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What is the relevance of the Tropics and the Polar Circles? Do they Exist on other planets?
The middle line is the equator, the second and fourth line are the tropics, the first and fifth are the polar circles.
What is the relevance of these bands on Earth? Do these exist on other planets? ...
user96