As part of its plan to send the first woman and next man to the Moon by 2024, NASA is looking to acquire some dirt. Today, the agency confirmed that it will pay private companies to “collect a small amount of Moon ‘dirt’ or rocks from the lunar surface.”

NASA put out a call asking companies to submit their proposals and says it’s open to working with companies outside of the US. NASA will require that they provide imagery of the collection and collected materials, plus location data. The collected material will become the sole property of NASA, and the agency is hoping to secure samples by 2024.