How did the passion flower get its name? When the first Christian missionaries landed in South America in the sixteenth century, they found a plant which seemed to be a very good omen for the success of their mission. They called it the passion flower because they thought that it symbolised the death of Christ.
Astronauts actually grow 2 to 3 inches taller (5 to 8 centimeters) when they are in space! The stretching can cause them some pain; many astronauts have back pain while they are in space and the stretching can potentially injure nerves. Expedition 10 Crewmembers onboard the International Space Station.
Humans traveling in space are also at great risk for barotrauma, decompression sickness (also known as 'the bends'), and immune system issues. The atmosphere on Earth provides a large amount of protection from cosmic radiation, but without an atmosphere surrounding us, we are much more susceptible to this danger. This is one reason that space travel by humans to places like Mars would be very dangerous to our health. Astronauts traveling this far would be at a much greater risk for dangerous radiation exposure, which can lead to various diseases like cancer.