Vacuum spheres at NASA's Langley Research Center in Virginia have been dusted by a light fall of snow in this 1969 photo. The spheres housed wind tunnels that were part of Langley's Hypersonic Facilities Complex.
Vacuum spheres at NASA’s Langley Research Center in Virginia have been dusted by a light fall of snow in this 1969 photo. The spheres housed wind tunnels that were part of Langley’s Hypersonic Facilities Complex.Image credit: NASA