Is Mina decentralized?

Could you please elaborate on the question, "Is Mina decentralized?"? I'm interested in understanding the characteristics and architecture of Mina that contribute to its decentralization, if any. Additionally, I'm curious about the consensus mechanisms Mina employs and how they support a decentralized network. Could you provide insights into Mina's governance structure and how it ensures decentralization? Furthermore, are there any known challenges or limitations to Mina's decentralization that I should be aware of? Thank you for your assistance in clarifying this matter.