Questions tagged [earth]
Questions regarding the planet on which humans live; the third planet from the Sun.
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Does Venus have the same mass of nitrogen in its atmosphere as Earth?
I know that the atmosphere of Venus is more dense and massive than Earth's, and that it's like more than 90% made of CO2 and the rest is N2. But is the mass of that small percentage of Nitrogen equal ...
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How to measure a year without relying on the Earth's tilted axis?
A year is defined as one full orbit of the Earth around the Sun. Okay, and how was this determined? There aren't mile markers out in space. It's also not like those over-simplified pictures of perfect ...
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Where are the foci of Earth's orbit?
The following is a figure from a textbook, it depicts the Earth's orbit in space.
I added the red annotations for the sake of this question.
I know that according Kepler/Newton the orbit is an ellipse ...
- reputation score 191
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What would the shadow path of a geostationary object be?
If we managed to put an object into geostationary orbit over the Earth that was large enough to cast a noticeable shadow on the ground, what path would that shadow take? I’m wondering both about the ...
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What would it look like if we were to make projections of constellations on earth surface to mark locations? [closed]
I am an author and I need help with my modern fantasy novel. For my story I need coordinates that change with time. My initial plan was that these locations were to be based on the locations of ...
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Where are we currently in the moon's apsidal and nodal precession cycles?
I want to code up a simple model of the earth-moon system assuming fixed values for the nodal and apsidal precession cycles. I've been able to find very precise estimates for the length of the cycles, ...
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How would Earth's orbit change if the Sun lost 1% of its mass per century?
The Sun naturally loses mass over time through radiation and the solar wind, but this occurs at a very slow rate. Hypothetically, if the Sun’s mass loss were accelerated to 1% per century (whether by ...
- reputation score 863
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When will Earth be in perihelion in the year 3088?
I tried to use JPL Horizons and came up with the 9. January but another Source
gave more like 21. January.
I need the exact date for some private research. Can someone post it maybe with a Graphic ?
...
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Blue spiral structures in the night sky; have they been seen and reported historically? [closed]
Large, luminescent blue spiral structures in the night sky, have been reported several times over the last 3-4 years, and photographs and films have been published. One was seen here in Sweden on ...
- reputation score 149
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What is the evidence that Earth has remained a constant mass object for the entirety of its existence?
I was searching around, and I am wondering what is the evidence used to support the hypothesis that Earth has remained relatively the same mass for its entire existence.
It would make more sense that ...
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Where is earth located after 2 years in relation to Mars assuming perfect circle orbit and at the start both planets are aligned?
According to Copernicus the assumption was that the planets orbit in perfect circles. Based on that his model was created. I was reading about this and I am confused on the following:
The earth moves ...
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Magnetosphere temperature
I read Wikipedia Magnetosphere webpage not finding anything about temperature.
Does Earth's Magnetosphere have a temperature?
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How accurate can you model atmospheric refraction near sunset?
This is a spin-off of a previous question on Moon sighting (Moon sighting: how hard is to predict the visibility of crescent/new Moon given excellent weather conditions?). I want to know how precise ...
- reputation score 217
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Why do Neptune, Jupiter, Saturn and Uranus spin faster than the Earth?
Why do Neptune, Jupiter, Saturn and Uranus spin faster than the Earth? They are much further out than the Earth from the Sun, and they are far more massive. Jupiter has >300 times the mass of Earth ...
- reputation score 89
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Can the L1 Lagrange point have a Lagrange point between it and the Earth?
Between the Earth and the moon, there is the L1 Lagrange point. An object at L1 will orbit the Earth along with the moon, though the orbit may not be stable. My question is: can there be another ...
- reputation score 49