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.
All stars begin as dust and tiny particles in a cloud of gas called nebulae. They develop into stars by passing through several stages over a period of millions of years. Once a star is born, it emits heat, light, x-rays, ultraviolet rays, gamma rays and other forms of radiation.