8- Mir space station- $4.2 billion
Mir was a space station owned by Soviet Union and later by Russia. The space station operated the low Earth orbit from 1986 to 2001.
It was the first modular space station with greater mass than any previous spacecraft. And until 2001, Mir was the largest satellite in orbit.
The station served as a microgravity search laboratory in which crews conducted experiments in biology, human biology, astronomy and many others.
Mir also was the first continuously inhabited long-term research station in orbit and it set the record for the longest human presence in space at 3.644 days.
The costs estimated by Yuri Koptev (the director of the Russian Federal Space Agency at that time) were at $4.2 billion.
