Vega is located roughly 25 light-years from us, so it doesn't look quite as bright as some stars, but it is still one of the brightest stars in the cosmos. It is of interest to astronomers because it is relatively young — Vega is around 450 million years old, which is less than a tenth of the age of the Sun. Vega is visible in the Northern Hemisphere in summer among a group of three bright stars (the other two being Altair and Deneb) that comprise the "summer triangle."