The mesosphere was first identified in the early 20th century, primarily through observations of meteor trails and radio waves. The credit for its discovery is often given to Leonid Aleksandrovich "Leo" Běhounek (1895–1964), a Czech physicist, who used radio waves to study the upper atmosphere in the 1930s. He also proposed the name "mesosphere".
Albert Einstein was a brilliant theoretical physicist who made groundbreaking contributions to physics, particularly in the areas of relativity, the photoelectric effect, and Brownian motion. He wasn't involved in the study of the Earth's atmosphere or the discovery of the mesosphere.