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Questions tagged [space]

The near-vacuum extending between the planets and stars, containing small amounts of gas and dust. Also called outer space to refer to the physical universe beyond the Earth's atmosphere.

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Is space a thing?

Based on my extent of knowledge relating to astrophysics, I once thought space is a thing, which can be twisted a long side with Time regarding masses of objects(According to relativity theory). But ...
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54 views

Who was the first to realize that the Earth is surrounded by vacuum? [on hold]

My question isn't about the arrangement of planets in space (geocentrism / heliocentrism), nor the understanding of the whole universe (we are in a galaxy, there are galaxies etc). My question is: who ...
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1answer
569 views

Is there any habitable exoplanet around Tau Ceti?

I was wondering.. is there any habitable exoplanet around Tau Ceti?
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1answer
57 views

How to convert factors of time dilation into something relatable? [duplicate]

On this post, Time according to the gravity of Sagittarius A? They found the factor of time on the varying distances from the SMBH, I am curious on how to turn those factors into relatable terms ...
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2answers
109 views

How much of the Universe is subatomic? [closed]

How much does subatomic particles such as photons, tachyons, and electron being the biggest particles etc. occupy space? If put in a ball how big of a ball would that be?
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81 views

Is it possible to detect exoplanets with a teleobjetive?

I would like to know please if it is possible to find exoplanets with a teleobjective.
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1answer
98 views

C-Type Asteroids and Carbonaceous Chondrite Meteorites

I was just wondering, what is the relationship between C-type asteroids and carbonaceous chondrite (CC) meteorites? Do CC meteorites come from C-type asteroids?
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1answer
68 views

Site to see direction to the Voyager by entering time and coordinates of my position on the Earth? [closed]

Where is Voyager relative to me right now in realtime?
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3answers
221 views

How did space start?

How did this 'black fabric' that we call space start? How was it made? How was the initial singularity formed? How did the first atom come into existence? If it all started from a tiny particle that ...
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1answer
573 views

Strange bright light in the sky flying fast [closed]

I was out with my dad on our porch watching the stars with our telescope. after awhile of looking and taking pictures I noticed something strange in the sky. There were two airplanes flying close to ...
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1answer
79 views

With all the stars in the universe, why isn't the sky saturated with light? [duplicate]

Space is dark. But if we direct telescopes to seemingly dark portions of sky, we see that it is filled with galaxies. If the universe is theoretically infinite, wouldn't an infinite number of photons ...
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1answer
141 views

Is a General Relativity approximation available in Universe Sandbox (1 or 2)?

This answer points out that including General Relativity in a simulation can be computationally intensive and may not be present in Universe Sandbox. However, answers to How to calculate the planets ...
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1answer
107 views

Will the TESS telescope be much better than the Kepler telescope?

I would like to know please whether or not the TESS telescope will be much better than the Kepler one. Thanks.
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3answers
7k views

What would happen to a polished marble statue left in space for a million years?

Consider it doesn't collide with any other objects. Would it be preserved perfectly in the vacuum or would its surface be damaged by anything like UV rays, radiation, gas, space dust, etc?
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4answers
333 views

In a planetary system close to the galactic core, would it be possible to see the supermassive black hole?

I understand that radiation on planets near the galaxy’s center make life on these planets nearly impossible, and that one cannot truly “see” a black hole. However, if you could stand on the surface ...
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3answers
180 views

Is the shape of observable universe and shape of space same?

I have read that Euclidean space is considered as flat space and Minkowski space is flat space-time. So when we say our observable universe is flat are we saying that the space is flat or space-time ...
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3answers
200 views

Can I slice off a piece of the Sun?

Bear with me. I want to explain this to my 6 and half year old. If, all things being equal, we could reach out to the Sun with a suitable implement, a gigantic space knife, could we cut a piece off ...
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1answer
113 views

Which space telescope is the most distant?

From the earth, and from the sun. Only interested in active, operational ones.
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1answer
189 views

What would happen if we released water into deep space?

If we went to deep space by a spacecraft and released water into space, what would happen? Would the water freeze to ice or would it remain as a liquid?
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1answer
363 views

What should I expect to see with my telescope with what EP's?

Recently got a Celestron 130 SLT (first "real" scope) and have a question. I have the following: 130mm F/5 newtonian, 650mm focal length scope 9 and 25mm factory EP's (more on that later) Svbony 2x ...
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3answers
417 views

How do we define temperature in outer space?

I was recently reading an article on space.com about : What's the Temperature of Outer Space. They said : Some parts of space are hot! Gas between stars, as well as the solar wind, both seem to be ...
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1answer
186 views

How can we ge to the exoplanet Proxima b? [closed]

I would like to know please how can we get to the exoplanet Proxima b. I heard it is the potentially habitable exoplanet closet to Earth at only 4.2 light years away. So exciting!
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1answer
133 views

What happens to organic material in space [closed]

Since there is no bacteria and oxygen in space, what will happen to a dead chicken's body if released into space? Assuming it's far enough for any nearby planet to collide with, will it rot? Freeze ...
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2answers
139 views

What would be the result if an asteroid collides with a space station? [closed]

What are the consequences going to be if an asteroid or a celestial body collides with a space station rotating on Earth orbit?
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1answer
61 views

Star map, where?

I have been looking at the website https://thenightsky.com and wanted to create a star map my self, from a specific place on a specific date. Where would I be able to find this?
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Is it relevant to ask the limits of space? [duplicate]

Yesterday I watched "The Orville" episode 4 and there was interesting moment where a kid and old man saw the space for the first time. Kid: What is this? Capitan: Kid, that is space. Old ...
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1answer
234 views

If universe is expanding why is the distance between planets not increasing?

General relativity tells us space is expanding.Then why does the distance between planets and heavenly bodies increase?
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2answers
688 views

Does Absolute Velocity Exist?

It seems everyone is on the same page about there being no "absolute velocity" due to the fact that everything is relativistic. However, this leaves me confused. This seems to be disconnected with the ...
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1answer
127 views

The photos of the outer space

How did the humans take photos for the galaxies, black holes, stars, nebulas etc in the outer space?! I guess they went out of the Earth planet and nearly out of the Milky Way galaxy by space-ships ...
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0answers
80 views

Does space not make sound, or can we just not hear it? [duplicate]

This is a question regarding sound waves and space. I know that sound waves must travel through a medium "air", enter our brains, and then we can decipher what exactly the sound is. But in space, ...
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1answer
1k views

Does the Sun have any atmosphere?

Does the Sun have any atmosphere of its own? Is it just like the atmospheres that the planets have.
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1answer
200 views

Why do we we even exist? [closed]

It came to my mind one day that why does this universe even exist and why do we even exist and like we are enclosed in the so called atmosphere and a floating rock in space called the Earth, so is ...
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1answer
3k views

Please help explain this unknown light in the sky. Not ISS. Not a star or comet. Too slow [duplicate]

So a few nights ago I walked outside on my front lawn and sat down on the tailgate of my truck. I was facing north. I was looking down and towards the house across the street. Out of no where a bright ...
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1answer
80 views

How do I know what I'll be able to see?

So I live in a suburb in Victoria, Australia. Less than an hour away from the city and I guess there is a bit of light pollution because from my backyard I can probably only see about 15 - 20 stars (...
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1answer
134 views

Which telescope should I buy? [closed]

I'm wondering which telescope I should buy, by the way, I'm new to astronomy and if you know any others that are under $100, It'd be appreciated. You don't need to take the price difference into ...
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1answer
80 views

Why isn't our local interstellar space colorised?

Looking at answers to this question, people seem pretty convinced that human naked eye should be able to see the colour of ionised gas/dust cloud when they are inside an emission nebula. And we know ...
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0answers
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Mass of quantum fluctuations in space?

I have no formal training in physics, just a casual interest, so if this question doesn't make sense i would love to understand why. I know from casual physics talks etc that pairs of particles pop ...
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1answer
71 views

In this image, where would the antumbra be?

In this image where would the antumbra be?:
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1answer
91 views

If the density of nebular distribution increases symmetrically in all directions, how does space curvature explain it?

Edwin Hubble, in The Observational Approach to Cosmology, wrote Thus the density of the nebular distribution increases outwards, symmetrically in all directions, leaving the observer in a unique ...
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1answer
358 views

Exo Planets and Planets difference?

After hearing that it has been confirmed that we found seven similar exoplanets like earth. I thought exoplanets were dead stars. After doing a little bit of research I found out that exoplanets are ...
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4answers
1k views

Can some stars not emit any energy in the visible spectrum?

Stars convert mass into energy. Even converting the slightest mass into energy is immense because the speed of light is so great and $E = mc^2$. This means that stars have to emit large amounts of ...
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1answer
86 views

Is there any plausible astronomical source of energy that could wipe out humanity without rendering the planet inhabitable?

I'm aware of hard radiations from space can wipe out life but I believe that would also causes the planet to be inhabitable for a period of time. Is there any other kind of energetic astronomical ...
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1answer
129 views

Is there available space images taken by the south pole Gregorian telescope?

I searched the internet for images taken by the South Pole Telescope but without successes in finding it. Edit:Some images
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3answers
455 views

Are we already moving faster than light?

Okay, so the speed of revolution of earth around sun is 30 km/s[1], speed of revolution of sun around milky way's center is ~200 km/s[2], speed of rotation of milky way is 828,000 km/h[3] i.e. 230000 ...
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2answers
184 views

How is a Galaxy formed?

How is a galaxy formed? I know that the center of our galaxy is considered to be Sagittarius A* and it's surrounded by a lot of stars (also a lot of neutron stars). But what makes this happen? I mean,...
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1answer
156 views

I think I saw a satellite disappear? or was it a star?

so i was gazing out of my balcony randomly and all of a sudden this red light moves across above, initial thought was that it was a star but it didn't blink, second thoughts was maybe a planet but it ...
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0answers
166 views

Is there mass i.e a physical bottom to a black hole? [duplicate]

All matter has a gravitational pull, a ball, a rock, a planet and a star - the bigger the matter the more it affects the space fabric around it thus having a greater gravitational pull. I see black ...
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2answers
69 views

High quality Space-related blog/website? [closed]

I don't know if this is the right place for asking this question, my apologies in advance. I would like to be updated on the latests news on space and I am looking for a website devoted to space news, ...
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2answers
123 views

Are there any sounds in space?

Is our universe noisy or silent? Can people hear them? When astronauts are out of the Earth and near an explosion, can they hear its noise.
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1answer
4k views

Is Universe Sandbox 2 realistic?

Universe Sandbox 2 is the second installment of Universe Sandbox that is available on Steam. It is an educational simulation game based on astronomy and anything space, it ranges from supernova ...