Questions tagged [interstellar]

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Hypothetical: Is the interstellar wormhole too close to the black hole? [closed]

Most reasonings about hypothetical wormholes say, that you need an extreme amount of energy to keep them open. Given that, isn’t the worm hole too close to the black hole gargantua? The gravity ...
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3answers
144 views

What would you find within a void?

I'm aware that voids are relatively empty regions of the universe, but just how empty can they be? Wikipedia states that voids have 'few or no' galaxies, but I can't find much else. To make my ...
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2answers
234 views

What fraction of starlight, seen from Earth, is actually reflected light?

Thanks to reflected starlight, many planets and comets in the Solar System have been visible to humans since long before the development of modern astronomy. Some of the starlight from outside the ...
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2answers
141 views

How do we know about the origin of ʻOumuamua?

How do we know that ʻOumuamua is interstellar and not otherwise? I fail to understand the logic that the extraordinary speed of the object proves it to be of interstellar origin, and that our sun's ...
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1answer
113 views

Our Solar System’s interstellar movement in relation to the Alpha Centauri System

Our solar system is moving at approx. 52,000 mph, so where is the Alpha Centauri system, which is assumed to be also moving through interstellar space at a similar velocity since it is part of our ...
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2answers
211 views

How did astronomers determine the path of 'Oumuamua so quickly?

The interstellar asteroid 'Oumuamua was discovered on October 19, 2017. Once discovered, less than a month's worth of precovery observations were found on various sky surveys. By mid-November, ...
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1answer
57 views

Is it possible for a solar flare in one star to influence the chances of a solar flare in another star?

Can a solar flare reach far enough to travel from one ordinary star to another? If so, how can that solar flare affect the following star?
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1answer
51 views

Interstellar bodies

Could a sun emit a large piece of matter that escapes it's gravity, and might eventually reach another solar system? And what would be the effect if a planet sized object reached our solar system and ...
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2answers
376 views

When would Oumuamua have entered the solar system?

So from what I've read, Oumuamua travels at around 26km/s when in interstellar space. I also remember reading a while back that Voyager was travelling at around <...
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1answer
151 views

Potential formation mechanisms of the interstellar asteroid 'Oumuamua

NASA recently discovered 'Oumuamua, an interstellar asteroid that appears to have a very elongated shape, unseen in solar system asteroids. What physical mechanisms, in the progenitor stellar system ...
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3answers
4k views

Why isn't interstellar medium pulled in towards nearest massive object?

How does the ISM resist gravity? That's the only force acting on it, and all other particles seem to collect together to form stars. What makes the ISM so special among other particles?
5
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1answer
252 views

Do liquids exist in the interstellar medium?

Am not asking about planetary/meteorite surfaces and am restricting myself to the interstellar medium edit: by interstellar medium I mean, the following: "Interstellar medium (ISM) is the matter ...
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2answers
945 views

What's the mass of the interstellar neighborhood of the Sun?

What's approximatively the mass of the interstellar neighborhood of the Sun ? (for example the neighborhood of radius 50 light-years). Remark: The mass of the observable matter should be completed ...
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2answers
418 views

Why do comets come from our local Oort cloud instead of from interstellar sources?

Comets form where stars form. And they are then ejected by the orbital changes of giant planets. But why are they ejected to form specifically a local Oort cloud instead of going interstellar and ...