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Questions tagged [space]

For questions related to outer space, stellar systems, stars and other astronomical phenomena.

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0answers
49 views

Can orbits change? [migrated]

I was reading about how the planet mercury changes it's orbit. I was wondering if farther away planets, partially ones with elongated orbits, could do that as well. Planets and objects such Halley's ...
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1answer
72 views

Estimates for undetectable planets in extra-solar systems [on hold]

Based on answers and comments on some previous questions (especially this one), and as very clearly illustrated by the scatter-plot here, there are some very definite limitations on our ability to ...
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6answers
1k views

Can a 15km, rapidly-spining asteroid go undiscovered until the asteroid belt is being actively explored?

What I want to know is if an asteroid about 15 KM in diameter and roughly double that in length, spinning at a significant speed, could go undiscovered until a crew of an asteroid mining ship happened ...
2
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3answers
187 views

Where to have a colony after Pluto?

I have a world where humans have developed interplanetary space travel that allow them to travel to other planets. There is an issue though- the speed is slow, sublight; as an example it will take at ...
7
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1answer
179 views

How close can a ship get to Sagittarius A?

Assuming that the only fancy available technology is FTL drives (to get there) plus anything needed to protect and sustain a crew during the journey from Earth to Sagittarius A (whether it takes a few ...
4
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3answers
192 views

Could you liquefy an asteroid to collect its resources?

Suppose you could pump a load of energy into an asteroid at a safe distance. As energy gets added to the object, does it make sense that this could be done in a way to get the asteroid to ...
19
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7answers
7k views

A secret base is built on Mars: is it noticed?

A secret society of inventors has been hiding for years. Finally, they have designed their Mars base in the year 2019! Unfortunately, they "borrowed" most of their supplies. If they were to build a ...
5
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6answers
1k views

How could someone ground a breathable synthetic atmosphere onto a small asteroid?

Let's say there are billions of asteroids in the galaxy, varying in size from baseballs to hunks of rock almost big enough to be dwarf planets. If someone wanted to set up a habitable location on one ...
2
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3answers
87 views

What would the temperature variation of an outer orbiting planet look like in a binary system?

I am creating a binary star system with a likeness to the Alpha Centauri system with an outer orbiting planet like Proxima Centauri. On an earth similar planet what would the temperature variation ...
14
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1answer
178 views

Can an ion drive cause an aurora?

In near future a large spaceship is built. It is nuclear powered, has a crew of two dozen, and is propelled by an advanced ion drive like VASIMR. The Variable Specific Impulse Magnetoplasma Rocket (...
4
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2answers
593 views

Vacuum Rated Sharpie Or Dry Erase Marker/Board?

Would it be possible to make a sharpie or a dry-erase marker that would work in a vacuum? Would they already work? To that end could you make a dry erase board or some such?
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5answers
2k views

If a space shuttle was going to crash during a botched landing back on earth, is there any way for crew to eject safely before impact? [closed]

If a space shuttle is going to crash during a botched landing back on earth, is there any possible way (emergency vessel, etc.?) for crew to eject and land safely away from the shuttle?
7
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4answers
2k views

How would a real modern day space shuttle operate without satellites or any kind of communications signals?

what role do satellites, communication towers, GPS, etc. play in the operation of, and specifically the landing of, a space shuttle? If those and any other human-made things suddenly disappeared, ...
3
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9answers
264 views

How to explain the presence of a dense debris field around Earth?

I'm creating a sci-fi world similar to ours roughly 50 years in the future. Unobtanium, a futuristic metal and fuel source, was discovered in 2020. Its broad utility led to rapid advances across all ...
5
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1answer
98 views

How does the n-body-problem affect a star system around a red dwarf?

So my story is set in the TRAPPIST-1-system and a rogue planet enters the system. When it's still far off, a scientist discovers that one of the numbers is slightly off. (She has some tables that ...
9
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9answers
6k views

What would shake a galaxy and what would shake the universe?

I'm trying to think of what kind of cosmic event would cause an explosion powerful enough to "shake" or disrupt the whole flow of a galaxy and on that same note what other kind of super cosmic event ...
8
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4answers
792 views

Victorian astronomer detecting artificial satellites

To make it short, time-space shenanigans transported everything in a 60 kilometers circumference around an old space-based particle collider to the year 1855. The particle collider was in ...
4
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3answers
511 views

Space vacuum food preservation

In a world I am creating, some people have colonized Ceres-like and Moon-like worlds - that is, they live in domes or underground, in pressurized buildings. The planets have no atmosphere for all ...
1
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1answer
113 views

Space warfare in near-earth orbit [closed]

Related to This question which was very open-ended, but it got me thinking about a very specific setting: Modern Earth as is, or maybe 5-10 years into the future, so every major nation (US, EU, ...
-2
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1answer
134 views

Deep-space species [closed]

How feasible are these characteristics for a species based on Earth-like biology? Living entirely in space. That is, being able to survive in a vacuum. Having a method to propel itself without using ...
56
votes
19answers
11k views

How do I make a space battle both realistic, with physics in play such as no sound and weird motion, but also very epic and intense still?

I always wondered what it would look like for a Sci-Fi battle in space to occur if it were a bit more realistic. I don't plan to use any space fighters or anything like that, just big capital ships ...
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votes
2answers
104 views

A balloon that can float to space [closed]

I’ve heard there are materials that can withstand the image sort of the earth’s atmosphere, such as carbon nanotubes and Kevlar. Supposedly, a perfectly constructed bridge of such material could be ...
0
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2answers
274 views

If a human had metal bones that were completely inflexible, would this cause any ill effects?

I've got a subspecies of human, Homo Volantes, that has been designed to live both in zero-G and in surface gravity. Several adaptations have been made, one of them including the replacement of ...
12
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3answers
309 views

How far from the Sun could we detect an alien spacecraft similar to the Voyagers?

Suppose that there is an alien spacecraft travelling towards the Sun. This spacecraft is similar in design, size and power output to Voyager 1 and Voyager 2 as they were immediately after launch from ...
23
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10answers
5k views

How to improve TCP/IP for an interplanetary WAN?

Background It is the near future. After a major world war and limited nuclear exchange, the nations of Earth have consolidated into a few blocs. The threat of further war and the cumulative damage to ...
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2answers
102 views

Threats within 100 light years

So I'm making this game where the player has to launch probes into interstellar space within a 100 * 100 light years map to detect threats that could wipe out humanity in a few decades. Everything is ...
7
votes
2answers
246 views

Are there currents in space? Space flotsam?

You know how there are some beaches in the world where tons of sea glass or other random sea trash washes up, just because the currents and the shape of the land naturally collects it all there? I was ...
1
vote
1answer
118 views

Big moon, small planet - can an earth sized moon orbit a moon sized planet?

I know that objects with lower mass tends to orbit objects with higher mass, is it possible to have a Moon sized planet who's mass is so heavy that an Earth sized planet orbit it as it's Moon in a ...
4
votes
4answers
265 views

Is it possible for a naturally occuring star system to have 120 planets?

In my book series (link here), there is a star system at the northern edge of the galaxy called the Ryu system. I am planning for this star system to be huge, encompassing 120 planets. The vast ...
29
votes
14answers
6k views

Is it possible to rule a galaxy without mastering teleportation?

I would like to know if a very advanced civilisation could rule an entire galaxy without mastering teleportation or any other method that allows traveling faster than light (unless you give ...
12
votes
1answer
211 views

How much electromagnetic transmission noise does Earth have to emit to be noticeable?

From time to time I'll see things talking about how thanks to all of our radio communications, we're effectively broadcasting our existence to the entire universe. However, when I did some back-of-the-...
1
vote
1answer
136 views

How do I create the largest possible space habitat for humans? [closed]

So I'm making a post-FTL world in which humans are the first, and so far only, species to explore the stars. It's thousands (if not millions) of years in the future, and we've become post scarcity. ...
3
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1answer
83 views

Terraformed planet orbiting a blue star

A planet was terraformed in humanity's distant past by technologically superior beings. The planet is very similar to Earth. I understand blue stars are highly radioactive and thus don't have real ...
8
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3answers
439 views

Could mirrors be put in space to see ourselves in the past?

Could a mirror/s be made to reflect one side of the Earth from the edge of the solar system and viewed with a optical or radio telescope that is in orbit? With night vision, along with radio and ...
13
votes
5answers
2k views

Why did US government hide the discovery of an ancient civilisation on the moon? [closed]

July 20, 1969, Neil Armstrong sets his foot on the moon surface. He declares : "That's one small step for [a] man, one giant leap for mankind". But what history books don't mention is that, as he ...
17
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5answers
3k views

Could deliberately induced Kessler Syndrome stop ICBMs?

In a previous question I asked how Mutually Assured Destruction could be made not assured. Most of the highly rated answers focused on political methods, but one answer raised the possibility that ...
3
votes
3answers
178 views

Largest artificial planet

How large could a solid planet be (in theory) without becoming a star or black hole? Too much in the way of light elements would lead to thermonuclear ignition, but too many heavy elements would ...
9
votes
4answers
2k views

Can I have wind turbines on my base?

Background A colony of humans has settled on a remote planet where there is little to no sunlight, but there is a plentiful amount of earth metals. E.g.- Iron, aluminium, Titanium, etc. There are ...
0
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3answers
63 views

How to interface with beings in the galactic core?

Context: So assume there are an unknown number of near-omnipotent/omniscient beings who have been confirmed to live inside of an area of space called the Active Galactic Nucleus (AGN). To provide a ...
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3answers
109 views

Extraterrestrial blackmail by reversible sun block [duplicate]

In a near future scenario where humanity has a slightly more developed/active space flight. Think colonising the moon with regular space flights back and forth. But no fancy interstellar tech. ...
18
votes
6answers
403 views

Can my spaceship figure out its position using Cepheid Variables?

In my story, reasonably far in the future, an intrepid group of explorers are on the first manned mission to the Andromeda galaxy, travelling close to the speed of light. They slumbered in suspended ...
0
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2answers
148 views

Peeping at Antipodes: How long would it take to peek around the sun using modern technology?

Assuming humanity was suddenly highly motivated to do it, how long would it take a probe launched from Earth to get into a position to record and broadcast images of the position in the opposite orbit ...
12
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3answers
1k views

How fast would a Martian space elevator travel?

READ EDITS I am writing a passage about the main character of my book travelling up a space elevator to the spaceport that rests in geostationary orbit above Mars. This means that the elevator would ...
10
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7answers
657 views

Which part of the universe would make celestial navigation most difficult for a planet?

Premise I envisage a world of would-be navigators with roughly Bronze Age technology, sailing on ships to explore their planet. In contrast to our history of navigation where we "cracked the code" ...
0
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3answers
175 views

What makes humans so special amongst the thousands of civilizations? [closed]

Alas, the galaxy has been colonized for many millenia. Hundreds, if not thousands, of advanced civilizations have emerged. Empires have risen, fallen, and the scourge of intelligent life forms ...
1
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3answers
191 views

Minimum required technology for a species to reach space?

Ok so first of all, let's imagine a civilisation on a planet. The planet has a relatively low escape velocity, say 6 km/s and maybe an atmosphere 30% - 50% the thickness of earth's atmosphere. Now ...
3
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2answers
185 views

Realistic date and dimensions for a first future space shipyard? [closed]

If I try to imagine a time and scale (mass and size) for a first space shipyard mankind would build in next decades, how would it look like in a mostly realistic scenario? Ships I think of are more ...
2
votes
4answers
222 views

How do we know that distant stars and galaxies are real?

In some universe,with physical laws the same as in ours, our world is some kind of "lab environment". Our solar system is enclosed in a balloon-like sphere with a radius of a few light-days around the ...
1
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7answers
143 views

Would ai surpass humans in bipedal combat?

I was thinking of writing a story where a bipedal walker has the tactical, mechanical, and autonomy of a real person. Would it be viable to use an base ai that has already learned and trained to pilot ...
0
votes
1answer
121 views

What materials would be useful in constructing a Space Station?

For the obvious reason of weight, our modern space stations and satellites are made out of metal or lightweight compounds to reduce cost. In a quick Google search, about $20,000 per kg is the cost, to ...