a space probe can orbit / land on other planets & mars is a kind of planet ->  a space probe can land on mars  a space probe can land on mars & a space probe is used for collecting / analyzing materials / samples / information ->  a space probe can land on mars and collect and analyze samples  a space probe can land on mars and collect and analyze samples & the viking i lander was sent to mars and analyze atmospheric gases and soil samples -> the viking i lander is a kind of space probe