A B-Class star is a type of massive star that falls within the spectral classification of B. These stars are known for their blue-white color and high temperatures, typically ranging from 10,000 to 30,000 degrees Celsius. They are much larger than our Sun and can be several times more massive, often leading to a shorter lifespan due to their rapid consumption of nuclear fuel. B-Class stars are often found in young star clusters and are significant in the study of stellar evolution. Their intense radiation can influence the formation of nearby stars and the surrounding interstellar medium. Examples of B-Class stars include Sirius B and Altair.