James Jenkins
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2 answers
3 votes
190 views
Is there any record of a fountain pen having been used in microgravity?
5 votes

A fountain pen is unlikely to be used in microgravity as it is at least partially dependent on gravity to function. The pen draws ink from the reservoir through a feed to the nib and deposits it on ...

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1 answers
0 votes
67 views
Could a skyhook be used to change a satelites orbit from polar to equitorial?
Accepted answer
3 votes

Could a skyhook be used to change a satelites orbit from polar to equitorial? No There are several posts about skyhooks They are used to to move from one specific place (Earth) to another specific ...

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4 answers
2 votes
247 views
Can you buy land (while) in space?
2 votes

Why would being in space be any different from being in another country, or even at home during lock down (covid 19)? Every local government has different rules. With cash, transfer is just ...

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4 answers
27 votes
11k views
If the ISS had an emergency, how long would it take to get a rocket to it?
13 votes

The ISS does not have emergency's that require a rocket to bring supplies. It can have an urgent need of something. Either everyone stays on the ISS or some/all crew leave. It is downhill all the way ...

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1 answers
3 votes
311 views
Solutions for transporting water to space
1 votes

Water is only cheap on Earth. See related What is the current cost-per-pound to send something into LEO? (spoiler 1 Liter = 1KG, 3.78Liters = 1 gallon; very cheapest is more than 15,000USD to get 1 ...

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6 answers
47 votes
9k views
Can/should you swim in zero G?
1 votes

Yes, you can. This subject is well covered in the book The Integral Trees (1984) by Larry Niven The majority of Smoke Ring animals have evolved to fly on at least an occasional basis—even the fish....

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4 answers
8 votes
2k views
Dark side of an exoplanet - if it was earth-like would its surface light be detectable?
13 votes

Keep in mind that earth like exoplanets are mostly found as they cross in front of their sun. If you hold a flashlight between you and the sun, you would not be able to tell if it was on or off, ...

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2 answers
2 votes
167 views
Do astronauts floating in space experience disorientation and how do they overcome it?
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Compass directions, North, etc are Earth based references. Once you leave the Earth they have little meaning to a person in space ship. Think of it from a slightly different perspective. If you ...

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1 answers
3 votes
303 views
What Apollo equipment could be salvaged from the Moon?
4 votes

The general consensus of answers at Can I borrow a lunar rover? is two points We don't really know for sure... Probably not realistic as we expect there will have been considerable damage. You can'...

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12 answers
144 votes
172k views
Couldn't I escape Earth's gravity traveling only 1 mph (0.45 m/s)?
8 votes

Unless you are very far away from Earth, if you are only moving away at 1 mph the gravity of Earth will pull you back to Earth (assuming you do not have an infinite fuel supply to maintain a 1mph ...

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5 answers
11 votes
1k views
Is it possible to navigate space travel with no computer?
1 votes

Robert A. Heinlein is a Science Fiction author well known for the use of extremely accurate calculations in launching and flying spacecraft. His novel The Rolling Stones is particularly noted for the ...

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3 answers
13 votes
5k views
Repurposing a nuclear submarine for space travel
8 votes

It would be easier to repurpose a large truck tire, and it would be more effective. Antzi has a great answer for NO but the question shows some lack of knowledge about the difference between imploding ...

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10 answers
30 votes
14k views
How many times do you have to circle the Earth to break orbit?
24 votes

Think of this as a slightly different question, and the answer becomes more clear. How many times do you have to circle the Sun to leave orbit? The Earth has been orbiting our Sun for about 4.5 ...

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6 answers
31 votes
6k views
What crewed space flight landed farthest off-target?
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I would argue that Apollo 13 landed farthest off target. The majority of the crew expected to land on the Moon. While they did land within site of their objective (you can see the Moon from anyplace ...

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6 answers
1 votes
6k views
Is it possible to stand still in space?
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0 votes

Yes, it is possible to be essentially standing still in relationship to the Sun. There are many comments and an answer telling you why you can't and, as far as they go, they are correct. If you ...

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2 answers
42 votes
17k views
Can fish really live in microgravity without water?
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16 votes

There have been several experiments with fish in space; as far as I can tell, all have used water rather than humid air as the habitat. While there is no definitive answer available as of 2013 (lack ...

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4 answers
3 votes
1k views
What is the closest to a perpetual motion machine that could be made to work in space?
0 votes

Assuming you don't get too near any stars, it is pretty easy to travel in temperatures that will support Super Conductors. Also assuming you can shield the heat of your ship from the device... Build ...

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4 answers
11 votes
653 views
Balancing a mirror
5 votes

You have missed another option for mirror placement, orbit them around the Mars. In much the same way as Larry Niven's, Ringworld is built. Your circle of mirrors are in a polar orbit of Mars. The ...

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2 answers
2 votes
836 views
Why does the Moon only show its near side while orbiting the Earth?
Accepted answer
5 votes

The Moon is Tidally locked to the Earth. This effect is known as synchronous rotation. A tidally locked body takes just as long to rotate around its own axis as it does to revolve around its ...

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3 answers
12 votes
940 views
How would a zero gravity cat litter box work?
5 votes

A solution by Jack McDevitt in "The Cat's Pajamas" (2012) used magnetic gravel and gentle suction to overcome the problems of a zero-gee environment. This was offered as a solution to a related ...

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4 answers
14 votes
7k views
How many photographs are there of the whole Earth?
6 votes

None: It is practically impossible to image all of a sphere in a single shot. As mentioned in another answer there a lot of photos; BUT all of those only show half the globe. It is possible to patch ...

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4 answers
16 votes
2k views
Who owns the moon?
Accepted answer
11 votes

While obviously the question does not have a single distinct answer There are some existing examples that can lead us to some conclusions Per the Outer Space Treaty of 1967 - No one owns the moon; "...

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5 answers
4 votes
596 views
How expensive would it be to make a spacecraft that can survive leaving an Earth suffering from Kessler Syndrome?
-1 votes

The Kessler Syndrome does not end space exploration. At worst it delays it. The number of satellites in LEO is self correcting in a few decades see Space debris half life If the amount of objects in ...

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1 answers
8 votes
529 views
Is the use of "former" with astronauts really necessary?
Accepted answer
7 votes

I believe the use of 'former' is representative of both their employment status and their licensing/qualification status. For instance a internet search for "former pilot" (including quotes) finds ...

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3 answers
11 votes
3k views
Why did we send those golden records on Voyager crafts?
11 votes

The Voyager probes, or any other spacecraft leaving the Solar system, do not pose a risk to future generations. As you mention in your question, they move relatively slowly. As Mark mentions in his ...

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3 answers
7 votes
683 views
Vehicle liquids freeze on Moon
2 votes

We often think of the freezing point as being the temperature where water freezes (273.15 K). There are several scales for measuring temperature, for simplicity lets use Kelvin here. If you have ...

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2 answers
6 votes
237 views
Has there ever been done research on mechanical assisted landing and takeoff?
1 votes

An integrated single vehicle regenerative brake would not be feasible. In short because you would not be able to gain any more lift then you could capture at landing. So if you have spring loaded ...

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2 answers
5 votes
577 views
Oxygen for manned missions
Accepted answer
6 votes

Providing sufficient oxygen for a long journey is not the challenge. If you have enough to meet the demands for a week, you have enough to meet the demands forever. Oxygen is not destroyed or created ...

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2 answers
11 votes
476 views
Is it feasible to pump fuel into orbit?
4 votes

Capillary action will not get your fuel to space as this article in Wikipedia points out the height of lift is related to the diameter of the tube, where a narrower tube gets you more lift measured in ...

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3 answers
12 votes
4k views
Would there be any benefit to sending a probe to a black hole?
-3 votes

It is theorized that Hawking radiation is emitted from black holes. In fact they are believed to eventually evaporate. So hypothetically you could send a signal using Hawking radiation, that could ...

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