Recently, NASA conducted a twin study that lasted for an entire year. The study saw astronaut Scott Kelly go into space for one year (the longest continuous stay in orbit) while his identical twin brother Mark, stayed on Earth. Using the information from the link, answer the following questions. https://goo.gl/uesR0o
1. Why did NASA want to keep the astronauts in space for an entire year when most stay no longer than six months for safety reasons?
2. Why did NASA do this study with identical twins?