How cold is interstellar space? - Astronomy Stack Exchange
2016年6月2日 · But since the interstellar medium (ISM) is so dilute, a normal thermometer will radiate energy away faster than it can absorb it, and thus it won't reach thermal equilibrium with the gas. It won't cool all the way to 0 K, though, since the cosmic microwave background radiation won't allow it to cool further than 2.7 K, as described by David Hammen.
terminology - Is "intrastellar" commonly used by astronomers to …
The CNET article Interstellar comet Borisov looks ordinary, making Oumuamua even weirder says:. A paper published Monday in Nature Astronomy lays out the early data on Borisov, which is just the second-ever object seen visiting our solar system from beyond.
Interstellar movie: What is the "portal" to the other galaxy?
2015年6月2日 · I recently watched Interstellar with some friends and we didn't come to the same conclusion. In my opinion, the portal they use to go to the other galaxy (to visit the three planets) is not a black hole. My friends tell me it is. (warning, contains …
Why is the interstellar medium so hot? - Astronomy Stack Exchange
2013年11月20日 · The difference in density is huge, with interstellar medium density at an average of $\rho ∼ 1\ ppcm$ (one proton per cubic centimeter), but the density of these WHIM being even a few orders of magnitude lower at $\rho ∼ 10^{−6}−10^{−5}\ ppcm$, or roughly 1 to 10 protons per cubic meter (NASA's Chandra X-ray Observatory quotes average ...
What are the differences between Intergalactic Medium, …
2021年10月29日 · 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 ...
Interstellar Dust properties - Astronomy Stack Exchange
2021年3月15日 · While it’s true that 98% of the interstellar gas is hydrogen and helium, dust is composed of the last 2%. That is, iron, carbon, silicon, oxygen, etc. 🚫 Finally, while it’s true that blue light is absorbed or scattered more efficiently by …
Is the angular size of the black hole in the movie "interstellar ...
2020年10月15日 · One striking example of this that has seems counter-intuitive, is the angular size displayed for the black hole "Gargantua" in the movie Interstellar. The characters in the movie are so close to it that it can be fully displayed in great detail (see attached image: Black hole seems to cover almost/over 90 degrees of the field of view..!)
Why does rotation prevent the further contraction of the cloud?
2021年4月16日 · At least four factors resist the compression of an interstellar gas cloud, and those factors must be overcome by gravity before star formation can begin. Third, everything in the Universe rotates. As a gas cloud begins to contract, it spins more and more rapidly, just as ice-skaters spin faster as they pull in their arms.
How does interstellar matter density vary? - Astronomy Stack …
2017年4月13日 · The interstellar medium is a multiphase medium, and you can find (some references in this lecture and in this thesis manuscript (this one is in French, but numbers are international)): the hot ionized medium (HIM) with density as low as 10^-3 cc (particles per cubic centimeter); the warm ionized medium (WIM), with density of the order of 0.03 cc;
interstellar medium - Speed of light through the ISM and …
2015年7月15日 · Articles written about fast radio bursts describe the signal's short-wavelength components arriving before its longer-wavelength components, suggesting energy-dependent time delays in the interstel...