While a tomato left to rot on Earth isn’t a pleasant thing to come across, Rubio’s tomatoes just look a bit dried out. “Other than some discoloration, it had no visible microbial or fungal growth,” NASA wrote in a blog post.

NASA has for years been experimenting with ways to grow food on the ISS and studying how the space environment affects plant growth. The red dwarf tomatoes were grown as part of a program called the eXposed Root On-Orbit Test System, or XROOTS, which uses a combination of hydroponic and aeroponic techniques instead of soil. Rubio, who was on the ISS for a record-breaking 371 days before his return in September 2023, harvested a batch of the tomatoes in March to be sent back to Earth and examined for the VEG-05 study.

As for the sample Rubio hung onto, which he intended to show to schoolkids in an event a crewmember had planned, the astronaut said the tomatoes simply disappeared. “I was pretty confident that I Velcroed it where I was supposed to Velcro it, and then I came back and it was gone,” he said. Rubio said he spent “eight to 20 hours” looking for it, to no avail. They were eventually found behind the Earth-facing hatch of the ISS’s Harmony module, a NASA spokesperson told Engadget.

The Harmony module, pictured above in 2021 with astronaut Megan McArthur inside, acts like a crossroads, port and “utility hub” on the orbiting station. Its hatch provides access to the pressurized mating adapter, where spacecraft carrying cargo or crews, like SpaceX’s Dragon, dock to the ISS. The months-old tomatoes were discarded after being discovered.

Update, December 20 2023, 11:28AM ET: This story has been updated to include new information from NASA on where the missing tomatoes were found.

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Cross-flights involve putting crews from multiple countries onto the same spacecraft. Roscosmos intends always to have at least one of its own representatives in the Russia section of the ISS and at least one NASA representative in the US section. The agency added that the decision was made "to maintain the reliability of the ISS as a whole." The ISS, launched in 1998, is a symbol of US-Russia cooperation after the Cold War and the space race ended.

The news follows NASA's April 2023 announcement that Russia will remain aboard the ISS until 2028. The Director General of Roscosmos, Yuri Borisov, had previously said Russia would pull out of the ISS "after 2024" to focus on creating its own space station. NASA had been preparing for Russia's departure with plans ranging from pulling astronauts from the ISS to figuring out how to control the ISS if Russia took away its thrusters. The US agency has committed to maintaining the ISS until at least 2030.

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