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Interstellar Dust properties - Astronomy Stack Exchange While practicing for an upcoming examination, I ran into this problem: Which of the following best describes dust grains in the interstellar medium: They are a few hundred nanometers in size (siz
What are the differences between Intergalactic Medium, Interstellar . . . The interstellar medium (ISM) is, as you say, the gas (and dust) in between the stars, within a galaxy It consists of molecular, neutral and ionized gas, with densities ranging from $\sim 10^ {-3}$ to $\sim 10^ {6}$ particles per cm $^ {3}$ and temperatures ranging from a few K up to 10,000 or 20,000 K The molecular gas is the coldest and densest, usually found in molecular clouds The
How cold is interstellar space? - Astronomy Stack Exchange The density of the interstellar medium is so very, very low that radiation losses completely dominate over conduction from the medium The interstellar medium can be very hot precisely because it is a gas (gases are a bit weird), and because it is extremely tenuous (extremely tenuous gases are beyond weird)
interstellar travel - 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 gravity failed to capture it
terminology - Is intrastellar commonly used by astronomers to refer . . . Quick checks of a few of them show a mixture of simple typos (i e , "intrastellar" used when "interstellar" is clearly meant), awkward failed attempts at synonyms for "intracluster stellar light", and actually correct uses meaning "inside a star" would extrasolar be used by astronomers to refer to objects outside of our solar system?
Why is the interstellar medium so hot? - Astronomy Stack Exchange What that ESA (European Space Agency) page titled Hot gas sloshing in a galactic cauldron that you link to describes are called WHIM (Warm–Hot Intergalactic Medium) They are not interstellar medium, but intergalactic medium gas The difference in density is huge, with interstellar medium density at an average of ρ ∼ 1 ppcm ρ ∼ 1 p p c m (one proton per cubic centimeter), but the
What is a Gentle Giant Black Hole? - Astronomy Stack Exchange A similar phrase, "gentle singularity," is used in the movie Interstellar There has been some discussion about that, in which the consensus seems to be that the size of a supermassive black hole reduces the tidal forces at the event horizon, such that a falling entity would not be spaghettified
Solar-system origin of interstellar bodies (like 1I ʻOumuamua)? I understand that 1I ʻOumuamua and the other two bodies (2I Borisov and 3I ATLAS) are classified as interstellar objects based on their distance from the Sun and their speed In other words the sum