On: New dark matter map reveals cosmic mystery

[interestica]

> 'ether of the 21st century'

Or 'caloric' or 'phlogiston'

https://en.wikipedia.org/wiki/Superseded_theories_in_science

[tigerlily → interestica]

Phlogiston, now there's a word I haven't seen in a while. A lot of big names on that list of superseded theories by the way :)

[kiba → interestica]

Dark matter is not a theory, it's a name for an unexplained phenomena.