Type O stars are among the hottest and most massive stars in the universe, with surface temperatures exceeding 30,000 degrees Celsius (54,000 degrees Fahrenheit). They are typically blue in color and can be up to 100 times more massive than our Sun. Due to their immense energy output, they shine brightly and are often found in young star clusters. These stars have short lifespans, usually lasting only a few million years before exhausting their nuclear fuel. When they die, they can explode as supernovae, leaving behind remnants like neutron stars or black holes. Their intense radiation also influences the formation of nearby stars and planets.