Martian meteorites are rocks that originated from the planet Mars and landed on Earth after being ejected into space by impacts. These meteorites provide valuable insights into the geology and history of Mars, as they contain minerals and gases that are similar to those found on the planet's surface. Scientists study Martian meteorites to learn about past conditions on Mars, including the presence of water and potential habitability. By analyzing their composition, researchers can better understand the planet's climate and geological processes, contributing to our knowledge of Mars and the possibility of life beyond Earth.