As of now, there is no way to directly purchase Terra Luna on Coinbase. However, there are a few workarounds that may be of use to those looking to invest in this altcoin.
No, you cannot purchase Terra Luna on Coinbase. Terra Luna is not currently listed on Coinbase, and there is no indication that it will be in the near future. Please do not purchase any products or services related to Terra Luna from any source other than an official Terra Luna website or authorized third-party store. There are many online scams claiming to offer Terra Luna for sale, so please be sure to research any website before making a purchase.
Perhaps the most straightforward method would be to first purchase another cryptocurrency that is available on Coinbase, such as Bitcoin or Ethereum. Once you have done so, you can then use this currency to purchase Terra Luna on a different exchange.
While this may not be the most convenient option, it is certainly doable and may be the best option for those looking to invest in Terra Luna at this time. Hopefully in the future there will be a way to directly purchase this altcoin on Coinbase, but for now, this workaround will have to suffice.