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How was helium first discovered?
mining of the radioactive element uranium
using spectral analysis of the Suns' emission spectra
o hubble obtaining samples from explosions off the surface of the sun
deep sea mining off the coast of Texas

Respuesta :

ariel6074
I think it’s the third one idk tho
sarinapayne26

Answer:

It's the second one I had it on a test :)

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