Because the one scientist was using feet, and the other scientist was using meters, in their calculations.
Beagle 2
The Mars Climate Orbiter disappeared in 1999 due to a navigation error that caused it to enter Mars' atmosphere at the wrong angle and burn up.
The Russian space probe Mars 2 went to space in the year of 1973.
The Mars satellite that crashed on Mars was the Mars Climate Orbiter. It crashed in 1999 due to a navigational error caused by a mix-up of imperial and metric unit systems during the spacecraft's mission.
No, a probe is a robot, so it's not really living.
Mars
The NASA space probe Pathfinder landed on Mars in July 1997.
The current US Mars probe is called Perseverance. It landed on Mars in February 2021 with the primary goal of searching for signs of past microbial life and collecting samples for future return to Earth.
The first Mars space probe expeditions that did not land on Mars were the Mariner missions, specifically Mariner 4, Mariner 6, and Mariner 7. These missions provided the first close-up images of Mars and valuable data about the planet's environment.
The US landed the Viking probe.
NO.
Mars.