Question: Where was a mission to study the dynamics of the region between 50 km and 100 km above the Earth's surface launched from on December 7, 2001
Sentence (from "Mesosphere"): The exact upper and lower boundaries of the mesosphere vary with latitude and with season, but the lower boundary of the mesosphere is usually located at heights of about 50 km above the Earth's surface and the mesopause is usually at heights near 100 km , except at middle and high latitudes in summer where it descends to heights of about 85 km .
Relevant evidence: Yes