3 ms·

Because Occam's Razor. Absorption spectrums have never let us down, and are used all the time. For this one place in the universe to have an exotic particle w

Because Occam's Razor. Absorption spectrums have never let us down, and are used all the time. For this one place in the universe to have an exotic particle with an adsorption spectrum is pretty much impossible. To have an adsorption spectrum that is an exact mach for Barium is just adding a second impossible on top of the first. Given the choice between something surprising and a doubly-impossible phenomena, the choice is clear.

nwiswell 4y ago
> Absorption spectrums have never let us down Devil's advocate: we have never had the chance to actually verify an exoplanet absorption spectrum. Could be that they are letting us down every time. In this solar system, yes, absorption spectrums seem to be reliable. Anywhere else is extrapolation.
- raydiatian 4y ago
  How many years until we verify? 100? 1,000? 10,000?
- c1ccccc1 4y ago
  Sounds like something we could check empirically. Some cosmic rays are protons from outside of the solar system. We could capture those and compare them with local protons to see if they're actually the same kind of particle. (We can check if two particles are the same kind or not by seeing what happens if we try to put them in the same place. If they're both protons, they should refuse to be put into the same state due to the Pauli exclusion principle.) As far as I know the experiment hasn't actually been done, though.
  - ianai 4y ago
    Those cosmic rays are an absolute gold mine of particle physics potential. Some of them easily exceed any accelerator we could build without going solar system scale. Edit-the best I can think is have every satellite built with a particle detector as a standard. No idea if those could be scaled down. Edit2-seems doubtful.
- ianai 4y ago
  So we know of two meteors that hit earth from outside the solar system. (One was IDed by the US DOD as traveling well in excess of the solar escape velocity.) They’re what Avi Loeb is bootstrapping a search for now. If those can be recovered all sorts of things can be tested and identified. It’s possible interstellar meteors are already in inventories and even studied but we don’t know what to look for to ID their source as such, yet. But more directly, absorption spectra are so intimately tied to the QM of the molecules and elements involved that they’re probably unique. (Hunch/not seen a proof.) This is also the most experimentally verified theory known.
- analog31 4y ago
  We also haven't verified the absorption spectrum of every atom on earth. All science is extrapolation.
akomtu 4y ago
To my knowledge, that's only been confirmed for Earth, Moon, Mars and a couple nearby asteroids. The rest is just extrapolation of our limited data. P.S. Those razors would better be kept in the bathroom as they only give an illusion of knowledge. P.P.S. I'd inspect material from Neptune first, in absense of better sources, such as comets.
- chaxor 4y ago
  Is your argument that translational symmetry in physics is wrong?
dvh 4y ago
*cough* phosphine gas in Venus atmosphere

nwiswell 4y ago

> Absorption spectrums have never let us down Devil's advocate: we have never had the chance to actually verify an exoplanet absorption spectrum. Could be that they are letting us down every time. In this solar system, yes, absorption spectrums seem to be reliable. Anywhere else is extrapolation.

raydiatian 4y ago
How many years until we verify? 100? 1,000? 10,000?
c1ccccc1 4y ago
Sounds like something we could check empirically. Some cosmic rays are protons from outside of the solar system. We could capture those and compare them with local protons to see if they're actually the same kind of particle. (We can check if two particles are the same kind or not by seeing what happens if we try to put them in the same place. If they're both protons, they should refuse to be put into the same state due to the Pauli exclusion principle.) As far as I know the experiment hasn't actually been done, though.
- ianai 4y ago
  Those cosmic rays are an absolute gold mine of particle physics potential. Some of them easily exceed any accelerator we could build without going solar system scale. Edit-the best I can think is have every satellite built with a particle detector as a standard. No idea if those could be scaled down. Edit2-seems doubtful.
ianai 4y ago
So we know of two meteors that hit earth from outside the solar system. (One was IDed by the US DOD as traveling well in excess of the solar escape velocity.) They’re what Avi Loeb is bootstrapping a search for now. If those can be recovered all sorts of things can be tested and identified. It’s possible interstellar meteors are already in inventories and even studied but we don’t know what to look for to ID their source as such, yet. But more directly, absorption spectra are so intimately tied to the QM of the molecules and elements involved that they’re probably unique. (Hunch/not seen a proof.) This is also the most experimentally verified theory known.
analog31 4y ago
We also haven't verified the absorption spectrum of every atom on earth. All science is extrapolation.

akomtu 4y ago

To my knowledge, that's only been confirmed for Earth, Moon, Mars and a couple nearby asteroids. The rest is just extrapolation of our limited data. P.S. Those razors would better be kept in the bathroom as they only give an illusion of knowledge. P.P.S. I'd inspect material from Neptune first, in absense of better sources, such as comets.

chaxor 4y ago
Is your argument that translational symmetry in physics is wrong?

dvh 4y ago

*cough* phosphine gas in Venus atmosphere