Scott Kelly (astronaut)
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Scott Joseph Kelly is an American engineer, retired astronaut, and naval aviator. A veteran of four space flights, Kelly commanded the International Space Station on Expeditions 26, 45, and 46.
Kelly at the Johnson Space Center in 2019
Scott Kelly (r) with his twin brother Mark in 2015 ahead of the Year in Space mission.
Kelly on STS-103 in a partial-pressure suit for reentry and landing (1999)
The crew of STS-118 (2007)
Twin
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Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic, meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic, meaning that each
Scott Kelly (astronaut)
…44, 45, and 46. The mission ended on March 1, 2016, with the departure of Soyuz TMA-18M from the station. Kelly retired from NASA on April 1, 2016. His identical twin brother, Mark Kelly, is also a retired astronaut, and the senior U.S. senator from Arizona. Scott Kelly was born, along with his identical twin brother…
Identical twins can be difficult to visually distinguish especially when young, as demonstrated by brothers Billy and Bobby Mauch.
Adult fraternal twins
Fraternal twin brothers as young babies
Austrian TV host Mirjam Weichselbraun (right) and her fraternal twin Melanie look very similar but with a significant difference in height.