One reason JUUL and vape pens are so popular among teens currently might be that they can be used indoors without attracting unwanted attention or creating a stench, Morean says. On Twitter, teens post about their usage in school.
What is a star's emission spectrum? It is the same as the HR diagram and gives the same information. It is the fingerprint of all of the colors of light emitted by a star. It is a graph of all the pollution given off by a star. It is a graph of the starâs solar flares.
Others, like helium, appear only in the spectra of very hot stars. The sequence of spectral types, OBAFGKM, is actually a temperature sequence with O representing the hottest stars and M representing the coolest stars. The table below shows some of the characteristic absorption and emission lines of each star.