Massive main-sequence stars

These stars belong to spectral classes O, B, A, and F and represent the giants of the universe, much larger and hotter than our Sun. If you imagine the Sun as a family car, these stars are like powerful rocket engines. They have masses many times that of the Sun and emit blue or white light due to extreme temperatures. In their cores, fusion occurs much more aggressively, meaning that although they have more fuel, they consume it very quickly—in millions of years rather than billions. They are crucial for the origin of life because they forge heavy elements in their interiors, which, after their explosion (supernova), become the building blocks for new planets.