What are the major milestones in human space exploration?

Human space exploration has achieved many major milestones over the years, starting with the first human spaceflight by Yuri Gagarin in 1961. Here are some of the major milestones in human space exploration:

• 1961: Yuri Gagarin becomes the first human to travel to space.
• 1969: Neil Armstrong and Buzz Aldrin become the first humans to walk on the moon as part of the Apollo 11 mission.
• 1971: The Soviet Union launches the first space station, Salyut 1.
• 1986: The space shuttle Challenger explodes, killing all seven crew members on board.
• 1998: The first components of the International Space Station (ISS) are launched.
• 2003: China becomes the third country to send a human to space.
• 2012: SpaceX becomes the first privately-funded company to send a spacecraft to the ISS.
• 2020: NASA's Perseverance rover successfully lands on Mars.

These major milestones in human space exploration have helped to expand our knowledge of the universe and have led to many technological advancements.