If you’re looking for an out-of-this-world gift for Mother’s Day this year, you could always name a Martian crater for Mom.

The space-funding company Uwingu, which sells naming rights to each of the nearly 600,000 identified Mars craters that don’t already have a moniker, is offering a special deal: Name a crater from now through Sunday (May 10), and you get a Mother’s Day certificate.

In addition, the people who buy the 50 largest craters will get an Uwingu gift certificate of equal value to their purchase, which they can use to name other Red Planet craters. (Prices are based on crater size and start at $5 for the smallest ones.)