Here's how human space exploration has evolved.
With private enterprise leading the way out into the solar system, the next few decades could see Amazon-ordered satellites, a lunar economic zone and the moon becoming a launchpad for Mars.
SpaceX plans to launch two paying passengers on a tourist trip around the moon next year.
India's space agency says it has set a record in launching 104 satellites at once.
Astronauts’ brains compress and expand in space, MRIs show.