BAMOS Vol 32 No.3 September 2019 | 页面 21

The first photograph of Earth from the V‑2 rocket flight of October 24, 1946. Source: White Sands Missile Range/ Applied Physics Laboratory The second flight took place on November 11 1935, this time with a crew of two, and using helium as the lifting gas in place of hydrogen. The mission was a tremendous success. They ascended well into the stratosphere, eventually reaching a height of 22,066 m (13.7 miles)—easily a world altitude record for manned flight up until that time. The mission gathered a wealth of scientific data, including information on cosmic rays, ozone concentrations and the chemical composition of the stratosphere. Perhaps even more significantly, a series of photographs was taken that clearly showed the curvature of the Earth and the visible curved top of the troposphere far below. After successfully descending, the flight was globally celebrated and the crew, dubbed “aeronauts”, became national heroes. Captain Albert Stevens and Captain Orvil Anderson were invited to an audience with the US President Franklin D Roosevelt and received numerous bravery and scientific awards. The crew capsule from this landmark aerial expedition is today on display at the Smithsonian Institution’s National Air and Space Museum. The V‑2 rocket flights, 1946–1950 Even greater heights were reached during the mid 1940s when an experimental series of high‑altitude rocket flights carrying cameras provided stunning views of our planet from the verges of space. BAMOS Sep 2019 Soon after the War’s end, the United States used modified German V‑2 rockets to investigate the atmosphere at high altitudes, in particular using cameras to capture images of the Earth from above 100 km (62 miles). On 24 October 1946, scientists attached a 35 mm motion picture camera to a V‑2 rocket that was launched into the atmosphere above the White Sands missile range in New Mexico, USA. The camera took photographs every five seconds from launch up until an altitude of 105 km (65 miles) above the Earth, and these were later retrieved from the wreckage of the V‑2 after it had crashed back to Earth. These images were the highest altitude from which photographs had ever been taken, finally beating the record set by the Explorer II balloon back in 1935. They showed stunning views of the Earth and various cloud formations far below. More than 1000 Earth pictures were taken from V‑2 rocket flights between 1946 and 1950 at altitudes ranging from 105 to 160 km (65 to 100 miles) above the surface. Clyde Holliday, the engineer who designed the camera used in the flights, later wrote in National Geographic that the V‑2 photos showed for the first time "how our Earth would look to visitors from another planet coming in on a spaceship." 21