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 ...

The study found that the early spectra of SN 2024jlf showcase flash ionization features in hydrogen-alpha, carbon and helium emission lines, which persist for about 1.3–1.8 days. The photometric ...

Hydrogen fuel cell vehicles bring together the power of combustion and the efficiency of electric propulsion while addressing the limitations of both. Ahh, hydrogen—the simplest and most ...