Helium followed a very different path. It first emerged not from a rock, a gas sample or a chemical experiment, but from a ...

A hybrid matter—an antimatter helium atom containing an antiproton, the proton's antimatter equivalent in place of an electron, has an unexpected response to laser light when immersed in superfluid ...

A complementary approach is to swap the helium gas for liquid helium, which has a much higher density. Sótér and colleagues found that this method could be used to measure very narrow lines in the ...

Researchers from the Yunnan Observatories of the Chinese Academy of Sciences and their collaborators reproduced the observed transmission spectra of the exoplanet WASP-52b at different wavelength ...

IN the course of an examination of the properties of the electron discharge in an atmosphere of helium we have made some observations of the conditions affecting the excitation of the lines of the ...