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www.space.com/23017-weightlessness.html

Astronauts, however, experience weightlessness for much longer periods. The longest sustained time spent in space took place in 1994-95, when Valeri Polyakov spent almost 438 days in space.

www.nasa.gov/mission_pages/station/research/subregional...

How Long Does It Take to Rebuild Bone Lost During Space Flight? ... How Long Does It Take to Rebuild Bone Lost During Space Flight? 02.26.07. ... and studies of bone loss and recovery in healthy astronauts in space. Each area of study complements the other." The research, formally named the Subregional Bone Assessment, was one of the first ...

en.wikipedia.org/wiki/Effect_of_spaceflight_on_the_human_body

Space medicine is a developing medical practice that studies the health of astronauts living in outer space. The main purpose of this academic pursuit is to discover how well and for how long people can survive the extreme conditions in space, and how fast they can re-adapt to the Earth's environment after returning from space.

www.space.com/25452-zero-gravity-affects-astronauts-hearts...

When astronauts spend long periods of time at zero gravity in space, their hearts become more spherical and lose muscle mass, a new study finds, which could lead to cardiac problems. The ...

www.quora.com/How-long-can-humans-live-in-space-and-what...

A bit more on the bone loss - it varies from astronaut to astronaut, and takes some years to recover after a long mission. Valeri Polyakov did a lot of exercise every day, and was ill towards the end of the mission - you have to exercise a lot in space to try to keep at health levels equivalent to someone who spends the same time in bed rest on Earth- and even so - you deteriorate compared to ...

www.quora.com/What-is-the-longest-time-an-astronaut-can...

Over long periods of time that takes its toll on the human body. SURGERY IN SPACE. In a long duration flight there is also a chance that one of the members needs surgery. If there is no possibility of an emergency return to Earth, it has to be done on the spot. It's probably only possible to do minor surgery.

www.youtube.com/watch?v=YNMkmydj1IA

***I've got a PATREON PAGE! Want to listen to a Vintage Space Podcast!? Consider becoming a patron! I've set up a Patreon account so I can raise money to buy the gear I'll need to make an awesome ...

en.wikipedia.org/wiki/Soviet_space_dogs

During the 1950s and 1960s the Soviet space program used dogs for sub-orbital and orbital space flights to determine whether human spaceflight was feasible. In this period, the Soviet Union launched missions with passenger slots for at least 57 dogs. The number of dogs in space is smaller, as some dogs flew more than once.

ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20030052739.pdf

RECOVERY AFTER PROLONGED BED-REST DECONDITIONING John E. Greenleaf’ and David T. Quach’ Ames Research Center SUMMARY Recovery data were analyzed from normal, healthy test subjects maintained in the horizontal or head-down body position in well-controlled bed rest (BR) studies in which adherence to the well-designed protocol was monitored.

www.sciencealert.com/what-happens-when-you-get-your-period...

We Need to Talk About What Happens When You Get Your Period in Space . AMY LYNN . 17 FEB 2018 . Since NASA's early days, periods in space have been a strange and mysterious topic for engineers. Countless things go into planning a launch and until Sally Ride became the first American woman in space in 1983, tampons and sanitary napkins were ...