ViscountTinew t1_iub3gg1 wrote on October 29, 2022 at 11:33 PM

Reply to comment by PM_Me_Frosted_Tits in Is dark matter orbiting galaxies with the same speed as normal matter? by taracus

Because whatever the mass is, it isn't emitting any light or blocking any light. Everything has a temperature and normal matter should be detectable in some wavelength or another, especially in the amount needed to create the lensing effects. A cloud of dust and gas massive enough to cause the lensing would be easily visible in the radio/far-infrared spectrums.

PM_Me_Frosted_Tits t1_iubbkah wrote on October 30, 2022 at 12:38 AM

I figured there was some reaction I just wasn't aware of that they've used, I didn't even think of things like friction between molecules as being enough to detect against the background of space at that distance.

I appreciate it, this is what I was hoping someone would be able to explain.

Natural_Pressure6329 t1_iubfq4w wrote on October 30, 2022 at 1:12 AM

This brings a question to my mind. There is a “neutral” point between two masses, it’s the point at which the two gravitational forces sort of level out (I forgot the proper name), could this be the cause of the lensing being centered there?

ryry1237 t1_iubg437 wrote on October 30, 2022 at 1:15 AM

Presumably any earlier calculations would already be done with this in mind and the math doesn't add up with just ordinary matter.