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
The two types of stars that end with supernovae are white dwarfs and massive stars that are at least eight times the mass of the sun. Each of these types of stars undergoes a thermonuclear reaction at the end of its life.Full Answer >
Stars have different sizes due to their mass and their individual stages during their evolutions, according to the Nova Celestia. Giant stars are particularly varied in size, as they have reached a stage wherein they start fusing helium — once the hydrogen runs out — into heavier elements in their core, causing them to grow larger.Full Answer >
The observable universe contains an estimated 6.8 x 10^24, or 6.8 septillion, stars. To reach this estimate, astronomers conducted an exhaustive inventory of the stars in the Milky Way galaxy, made reasonable inferences regarding the stars that cannot be seen from Earth and applied that model to the other galaxies within the universal horizon.Full Answer >
Stars appear bright based on their distance from Earth and their stellar classification. The measurement used to indicate the brightness of a star as seen from Earth is called the apparent magnitude.Full Answer >