Not exactly, some compounds absorb and reflect different parts of the electromagnetic spectrum. In paticular, titanium dioxide: "Some compounds, like titanium

Not exactly, some compounds absorb and reflect different parts of the electromagnetic spectrum. In paticular, titanium dioxide: "Some compounds, like titanium oxide, only appear in the spectra of very cool stars." [1] Obviously this wasn't a star, so it must be a manmade object. [1] From http://skyserver.sdss.org/dr1/en/proj/advanced/spectraltypes/lines.asp http://skyserver.sdss.org/dr1/en/proj/advanced/spectraltypes...