Why can't I buy celestia on Coinbase?

Could you please clarify why Coinbase doesn't currently support the purchase of Celestia? Is there a specific reason for this? I'm interested in investing in this cryptocurrency but I'm unable to find it on the Coinbase platform. Could you provide some insight into why this is the case and if there are any plans for Coinbase to add Celestia in the future? Additionally, are there any alternative platforms where I can buy Celestia? Thank you.