A B-type main-sequence star is a type of star that is hotter and more massive than the Sun. These stars typically have surface temperatures ranging from 10,000 to 30,000 Kelvin and are known for their blue-white color. They burn hydrogen in their cores at a much faster rate than cooler stars, leading to a shorter lifespan of about 10 million years. B-type stars are often found in young star clusters and are important for studying stellar evolution. Their strong ultraviolet radiation influences the surrounding interstellar medium, contributing to the formation of new stars. Examples of B-type stars include Sirius B and Altair.