has anyone been lost in space

Has anyone lost in space yes many of thea astronautshas been died in space. 

How much people died are lost in space?

Has anyone lost in space yes many of the astronaut has been died in space. 

A total of 18 people have lost their lives either while in space or in preparation for a space mission, in four separate incidents. Given the risks involved in space flight, this number is surprisingly low.

This is big disaster form NASA's space shuttle crashing in landing time.

The two worst disasters both involved NASA’s space shuttle. On 28 January 1986 the Challenger space shuttle blew up 73 seconds after take-off, owing to a failure on a sealant ring that allowed hot gas from the boosters used to lift the craft in the first two minutes of flight to hit the huge main external tanks containing hydrogen-oxygen fuel. 

All seven crew members died, including Christa McAuliffe, a teacher from New Hampshire selected on a special NASA programme to bring civilians into space. 

The Challenger disaster remains perhaps the most notorious in the history of spaceflight, owing to the number of people, many of them schoolchildren, who saw it live on TV.

How much astronauts died in training and testing for the spaceflight?

A further 13 astronauts and cosmonauts have died during training and testing for spaceflight. 

Perhaps the most notorious incident was a fire on the launch pad of the Apollo 1 mission in January 1967. 

The three victims were Roger Chaffee, Gus Grissom, who had been the second American ever in space, and Ed White, who in 1965 had become the first American to walk in space.