About the Mahavidyas
Mahavidyas are a group of ten aspects of Adi Parashakti in Hinduism. After the decline of Buddhism in India, Sakta and Buddhist goddesses were combined to form this list of ten. In a story from the Shakta Maha-Bhagavata Purana, which narrates the creation of all the Mahavidyas, Sati, the daughter of Daksha and first wife of god Shiva, feels insulted that she and Shiva are not invited to Daksha's yagna ("fire sacrifice") and insists on going there, despite Shiva's protests. After futile attempts to convince Shiva, the enraged Sati transforms into the Mahavidyas, who surround Shiva from the ten cardinal directions.
Kali for Saturn, Tara for Jupiter, Maha Tripura Sundari (or Shodasi-Sri Vidya) for Mercury, Bhuvaneshvari for Moon, Chinnamasta for Rahu, Bhairavi for Lagna, Dhumavati for Ketu, Bagalamukhi for Mars, Matangi for Sun, and Kamala for Venus.