Maximizing Roth Contributions: Spouse Contribution to Roth IRA for Prior and Current Years

Is it possible to contribute more than the $6,000 limit to the same Roth IRA by having my spouse and I both contribute?

 

We are filing jointly.

 

Is it possible for both of us to contribute in the prior year and the current year, making a total contribution of $24,000 in one tax year filing?