Questions tagged [earth]

Questions of the science and space exploration related to Earth.

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3
votes
2answers
3k views

How close can the moon orbit before it becomes unstable in its path

Ok, so sometimes you see pictures like this or this, where there is another planet super close on the horizon. This morning, I was laying in bed thinking, "How could we get two planets to orbit each ...
3
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1answer
1k views

Why doesn't all space debris burn up? [duplicate]

Man-made satellites have to use boosters to accelerate to maintain orbit around the Earth. Space debris and old satellites with depleted boosters should be either pulled by Earth's gravity, or slowed ...
4
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2answers
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Earth angular size looking from the ISS

Imagine you're, well, actually on the ISS so you're 395 km up. We've all seen many photos roughly like this... however this can be deceptive; They might be all fisheye lenses. A great many of these ...
12
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2answers
697 views

What existing life on Earth is best suited for the Martian environment?

What existing life on Earth is best suited for the Martian environment? By best suited, I mean it could theoretically be placed on Mars and easily adapt or thrive within the existing environment the ...
1
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2answers
98 views

Earth rotation confusion on Stapledon book

Hi everyone i am reading the Scifi classic Star Maker by Olaf Stapledon. The Second chapter starts with the following paragraph: "WHILE I was thus contemplating my native planet, I continued to soar ...
6
votes
2answers
668 views

If there was a probe orbiting at the edge of Earth's Sphere of influence, how slow would it orbit?

Would it orbit very slowly? It's kinda been stuck in my head lately...
1
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0answers
66 views

Has the weather been affected by the moons increasing distance from Earth? [closed]

The moon moves approximately 4cm away from Earth per year. Given that it affects Earth's weather, will this increasing distance already have had an impact on the weather (regardless of how negligible ...
1
vote
1answer
279 views

What would happen if we took out the moon? [closed]

I've noticed when I look this up online with a quick Google search this theme emerges: that without the moon, if it were to disappear, the days would speed up a lot to say, 9 hours long and you will ...
10
votes
1answer
1k views

How would changes in the Earth's magnetic field affect space exploration?

It is well-known that the Earth's magnetic field may flip (geomagnetic reversal), and some data suggests it is weakening or distorting. The following shows the Earth's magnetic field at its surface in ...
13
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1answer
1k views

Are there any proposals for a permanent orbital interplanetary ferry?

I believe I read in a book once a description of a kind of interplanetary ferry that would orbit the sun and regularly pass different planets like Mars and Earth. The idea of the ferry is to have a ...
5
votes
2answers
892 views

Extinction asteroid (10-100 km) impact avoidance

With the present "state-of-the-art" of space technology what is possible to do to avoid an Earth impact by rocky bodies 10 km to 100 km in diameter? Is there any international project to develop a ...
14
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2answers
2k views

Why does the Earth lose rotational velocity in the vacuum of space?

I think it is a well-known fact here that the Earth is slowly losing rotational velocity over time (some 1.4 milliseconds of the day are gained per hundred years). Eventually, this means that the ...
4
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4answers
2k views

How to respond to the case against space? [closed]

I am an avid space advocate and even studied aerospace engineering in college, however, I still struggle with a great answer to this question: "Why explore space?" A few days ago an old professor who ...
26
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9answers
8k views

Can a satellite orbit Earth so that it always has the Moon in line of sight?

Could a satellite, without too much fuel consumption for station keeping, orbit the Earth so that it always has a line of sight to the Moon? It would need a near polar orbit which precesses in tandem ...
5
votes
1answer
347 views

Are L1 to L2 and back “cheap” transfers/cyclers possible?

This paper studies transfers from halo orbit to halo orbit in the Jovian system. I wonder if there are any locally stable orbits connecting Earth-Moon L1 and L2 points. EDIT: One should also consider ...

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