“The results of this remarkable sale, with more than 400 registered bidders from 30 different countries, demonstrate the enormous admiration and affection with which Stephen Hawking was viewed around the world,” according to a statement from Thomas Venning, the head of books and manuscripts for Christie’s, and James Hyslop, the head of science and natural history.

Altogether, the items auctioned, which also included possessions of Sir Isaac Newton, Charles Darwin and Albert Einstein, were sold for more than $2.3 million.

The red wheelchair was used by Dr. Hawking during the late 1980s and early ’90s; he stopped using it when he could no longer steer it with his hands. The physicist spent most of his life steadily losing control over his muscles because of amyotrophic lateral sclerosis, or Lou Gehrig’s disease.