Hot gases don’t produce a continuous emission spectrum. Black hydrogen absorption lines are at the same wavelength as the bright hydrogen emission lines. Key fact Line emission spectra are ...

One of the largest structures in the sky, as seen from our perspective, has only just been discovered. It’s an enormous cloud ...

Named Eos, the cloud of gas would appear huge in the night sky if visible to the naked eye and could shed light on solar ...

Scientists have uncovered a colossal, previously hidden hydrogen cloud, named Eos, just 300 light-years from Earth — the ...