In 1997 three men from Yemen filed a lawsuit against Nasa for invading Mars. Adam Ismail, Mustafa Khalil and Abdullah al-Umari claimed they inherited the red planet from their ancestors 3,000 years ago. The three men provided the court in Yemen with documents, supposedly, proving their claim. However, it was never clarified whether the claimants had paid the appropriate inheritance taxes.
NASA has disregarded the Yemenis’ claim as ridiculous, pointing out that according to a 1967 international treaty “everything in the solar system, except for the Earth, is a property of everyone in the world and not just one country in particular”. Therefore, NASA’s landing on Mars doesn’t automatically turn it into American property as it is out there for everyone to explore, also stated the NASA’s spokesperson. The court in Yemen dismissed the claim as invalid.