Space Exploration
From the first satellite to the first steps on the Moon, and the next steps beyond.
🛰️ Sputnik and the Space Race
The USSR launched Sputnik 1 on October 4, 1957, the first artificial satellite. This shocked the USA and triggered the Space Race. The USSR also launched the first human (Yuri Gagarin, 1961) and first spacewalk (Alexei Leonov, 1965). NASA responded with the Apollo program.
🌙 Moon Landings
Apollo 11 landed on the Moon on July 20, 1969. Neil Armstrong and Buzz Aldrin walked the surface while Michael Collins orbited. A total of 12 astronauts walked on the Moon across six missions (Apollo 11, 12, 14, 15, 16, 17) before the program ended in 1972. No human has returned since.
🔭 Hubble Space Telescope
Launched in 1990 with a flawed mirror (corrected in 1993), Hubble has been one of the most productive scientific instruments ever built. The Hubble Deep Field image revealed thousands of galaxies in a tiny patch of seemingly empty sky. Replaced as flagship telescope by the James Webb Space Telescope in 2021.
🔴 Mars Exploration
Over 50 missions have been sent to Mars. Rovers include Sojourner (1997), Spirit and Opportunity (2004), Curiosity (2012, still active), and Perseverance (2021). Perseverance collected rock samples for future return to Earth and carried the Ingenuity helicopter, the first powered flight on another planet.
🌍 International Space Station
The ISS has been continuously inhabited since November 2, 2000, a joint project involving NASA, Roscosmos, ESA, JAXA, and CSA. It orbits at 400 km altitude at 7.7 km/s, completing 15.5 orbits per day. It is the largest structure humans have ever put in space.
🚀 Commercial Space and the Future
SpaceX has revolutionized launch costs with reusable rockets. The Falcon 9 booster lands itself. Starship aims to be fully reusable and transport humans to Mars. Artemis program targets a return of humans to the Moon. China aims for crewed Moon landing by 2030. Private space stations are under development to succeed the ISS.