Using the 8.1-metre Gemini South telescope in Chile, astronomers were able to take the clearest picture of R136a1, the largest known star in the universe. This discovery, led by Venu M. Kalari, is also important in terms of revealing that big stars are not as big as thought. How massive stars with masses at least 100 times that of the Sun arose is still a mystery to astronomers. Previous observations have shown that the mass of R136a1 is 250-300 times that of the Sun, but the latest discovery suggests that the number may be 170-230. Even with estimates falling, R136a1 still remains the largest known star on record.
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