While the sun is a star, not all stars are considered suns. In order to be classified as a sun, any given star must have planets orbiting around it, and not all stars do. However, the sun is not the only star that has planets orbiting it.
In the early 1990s, astronomers discovered that there were planetary systems orbiting around other stars, essentially making them suns. While only a few were found at first, scientists now know that many such systems exist. These discovered planets are now referred to as exoplanets so that they aren't confused with the planets in this solar system.Learn More
After stars like the Sun expand to become red giants, they will end their lives as a white dwarf star, until finally dimming to become a black dwarf. White dwarf stars are made from the collapsed cores of red giants, once the outer layers of the star have been expelled.Full Answer >
Stars can go through two red giant phases. After stars burn up hydrogen and become red giants, the core may shrink and allow helium to be used for fuel, returning them to main sequence stage. When the new fuel is burned up, the star may return to a red giant.Full Answer >
The North Star, Polaris, is found by mentally drawing and extending a line between the two stars at the end of the Big Dipper's bowl. Polaris can be seen from anywhere in the Northern Hemisphere, provided there isn't too much light.Full Answer >
The emission spectra of gases can be used to study stars because the absorption spectra of stars are the exact opposite of the emission spectra of the gases that compose the stars. When the light from a star is split into its component colors, it creates a continuous spectrum except for specific missing colors. These missing colors are the same ones emitted by heated gases in laboratory settings.Full Answer >