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.
An object with a surface temperature of, for example, 10000 K emits its peak radiation at a wavelength that corresponds to blue; a star with a surface temperature of 4000 K has its peak emission in red. That's why hotter stars appear bluer and cooler stars redder.