What are the most massive and luminous stars in the universe?

2023 Jan 20

The most massive and luminous known star is R136a1, which is located in the Tarantula Nebula in the Large Magellanic Cloud. It has a mass of around 265 times that of the Sun and a luminosity of about 8.7 million times that of the Sun. Another example is Eta Carinae, which has a mass of around 120 times that of the sun and a luminosity of about 5 million times that of the Sun.