Does the majority of astronauts (and cosmonauts) experience nausea, or symptoms of space sickness while adapting to micro-gravitational conditions? How severe are their symptoms and how much they vary by individual, e.g. does the majority throw up during the weightlessness adaptation period?

Canadian astronaut Chris Hadfield explains from the ISS that space sickness does occur and how astronauts experiencing it deal with it in this YouTube video.

Do the majority of astronauts (and cosmonauts) experience nausea, or symptoms of space sickness while adapting to micro-gravitational conditions? How severe are their symptoms and how much they vary by individual, e.g. does the majority throw up during the weightlessness adaptation period?

Canadian astronaut Chris Hadfield explains from the ISS that space sickness does occur and how astronauts experiencing it deal with it in this YouTube video.

Do the majority of astronauts (and cosmonauts) vomit during the weightlessness adaptation period?

It is well known they do vomit.

Does the majority of astronauts (and cosmonauts) experience nausea, or symptoms of space sickness while adapting to micro-gravitational conditions? How severe are their symptoms and how much they vary by individual, e.g. does the majority throw up during the weightlessness adaptation period?

Canadian astronaut Chris Hadfield explains from the ISS that space sickness does occur and how astronauts experiencing it deal with it in this YouTube video.