They are images from the golden age of space exploration: thousands of rare photographs recording the early days of manned flight into space. The collection, to be sold at auction this month, is the largest on the subject ever offered on the open market.
The photographs were amassed by a European collector. They are to be sold in just two large lots in Vienna and have an estimate of €400,000-€600,000 (£320,000-£480,000).
The images shed fresh light on the extraordinary period of technological advance and human achievement that sprang from the struggle between the US and the former Soviet Union.