Betelgeuse (α Orionis) is the bright reddish star located in the shoulder of the Orion constellation and can be seen by the naked eye in the night sky. From October 2019 to March 2020, Betelgeuse demonstrated a mysterious dimming, capturing the attention and imagination of both astronomers and the public. While being a variable star that exhibits periodic and sometimes irregular light change, this dimming is the most significant observed in the last 50 years. It became fainter by more than