The First Artificial Satellite
Year: 1957. The Soviet Union's Sputnik 1 became the first human-made object to orbit Earth, marking the start of the Space Race.
The First Human Spaceflight
Year: 1961. The Soviet Union's Yuri Gagarin became the first human in space, orbiting Earth aboard Vostok 1.
The First Moon Landing
Year: 1969. The United States' Apollo 11 mission landed the first humans on the Moon, with Neil Armstrong becoming the first person to set foot on the lunar surface.
The First Woman in Space
Year: 1963. The Soviet Union's Valentina Tereshkova became the first woman in space, flying aboard Vostok 6.
Construction of the International Space Station (ISS)
Year: 1998–present. Jointly built by the US, Russia, Europe, Japan, Canada, and other nations, the ISS is a flagship example of international cooperation, hosting continuous human activity in low Earth orbit.
The Voyager Program
Year: launched 1977. Voyager 1 and 2 explored the outer planets of the solar system and are now humanity's most distant spacecraft, currently flying through interstellar space beyond the solar system.
The Hubble Space Telescope
Year: launched 1990. Observing from beyond Earth's atmosphere, Hubble has contributed enormously to astronomy through stunning images and measurements like the rate of the universe's expansion.
Mars Exploration Rovers
Year: 1997–present. A series of robotic rovers — Pathfinder, Spirit and Opportunity, Curiosity, and Perseverance — have explored the Martian surface, studying geology and searching for signs of past life.
The James Webb Space Telescope
Year: launched 2021. Hubble's successor, JWST uses infrared observation to precisely study early-universe galaxies and the atmospheres of exoplanets.
The Rise of Private Space Companies
Year: 2020–present. Private companies like SpaceX have developed reusable rockets, dramatically lowering launch costs and ushering in an era of private crewed spaceflight.