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.

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..!)

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.

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 ...

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 …

2016年6月27日 · We distinguish space by its contents; the space within the heliosphere is called the interplanetary medium (it contains solar plasma, dust, etc.), while the interstellar medium comprises sparse gaseous molecules from the Local Fluff and (if you go far enough) the rest of the Local Bubble.

2014年12月28日 · An interstellar comet should have a large excess velocity. That is not what has been observed. The few comets that apparently are on a hyperbolic trajectory are deemed to have originated within the gravitational bounds of the solar system, with the hyperbolic orbit a result of non-gravitational forces and gravitational interactions with planets.

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 …

2024年8月4日 · $\begingroup$ Anything from interstellar space would be unbound, even if it was initially moving very slowly relative to the Sun. All such objects would have total energy >0 because they have some kinetic energy and ~0 potential energy because they started outside the Sun's gravity well. $\endgroup$

2020年2月17日 · Yes. the emissions from a pulsar do interact with interstellar medium - this effect is called dispersion. When the emission from the pulsar hits free electrons (and dust) in the interstellar medium, different frequencies in the pulse become "delayed" by different amounts corresponding to their frequencies - specifically, lower frequencies are …