Since 2013, a Dutch researcher has successfully been cultivating crops and wild plant varieties in a soil that closely resembles that from the red planet and the moon. Now lab results have shown that four of his crops are safe for human consumption.

Wieger Wamelink, an ecologist at the Wageningen University in the Netherlands initially wanted to grow a garden in a computer simulation using the scientific data he had on Martian and moon soil. However, when he discovered that NASA sold “Mars soil”—soil that is found on Earth but shares similar chemical properties to Martian soil—Wamelink knew he had to try it out for real.

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