How many people have been in space?
After the launch of STS-127 (Space Shuttle Endeavour) to the ISS, there will have been 500 people who have flown to space. (The launch will be around July.) So as of now, 499 people have been to space.
As of 6 July 2016, there have been 536 individuals who have visited space.
Total Number of People Who Have Been in Space (USAF definition) - 474 Total Number of People Who Have Been in Space (FAI definition) - 468 Total Number of People Who Have Been in Earth Orbit - 465 Of these, 47 have been women. I found all this information at http://www.worldspaceflight.com/bios/stats.php
It's impossible to know the answer to this. Evidence of space studies date back thousands of years, before telescopes were even invented. The Ancient Egyptians, Ancient Babylonians and Ancient Greeks all studied space. As far as we can tell, mankind has been studying the stars/space for over 6,500 years. Possibly longer.
There have been humans living in space since the late 1980's. NASA had a few people aboard the Spacelab back in the 80's, and the Russians had people aboard Mir starting in 1989 until it was abandoned in 1999. The International Space Station has been continuously occupied since November 2000, so there have been people living in space for most of the last 20 years. Living in space takes care and technology, but there is…