In the early days of space travel, two large space telescopes werde installed in Earth's orbit - the Hubble Space Telescope (HST) and the James Webb Space Telescope (JWST). Both telescopes have changed the look of humanity to the universe crucial and made many new discoveries possible. Most important is the HST image of the "Pillars of Creation" in 1995, the "Hubble eXtreme Deep Field" in 2012 and of course the first actual image of an Earthlike Planet by the JWST in 2025.
The Voyager program was a famous American scientific program that employed two robotic probes, Voyager 1 and Voyager 2, to study the outer Solar System. They were launched in 1977 to take advantage of a favorable alignment of Jupiter, Saturn, Uranus, and Neptune, and were exploring the outer boundary of the heliosphere.
Pioneer 10 was an American space probe that completed the first mission to the planet Jupiter. Thereafter, Pioneer 10 became the first spacecraft to achieve escape velocity from the Solar System. It was launched on March 2, 1972. Between 1972-1973, it became the first spacecraft to traverse the asteroid belt.
The Arecibo message was broadcast into space a single time via frequency modulated radio waves at a ceremony to mark the remodeling of the Arecibo radio telescope in Puerto Rico on 16 November 1974.
The Wow! signal is the name given to a strong narrowband radio signal detected by Jerry R. Ehman on August 15, 1977, while he was working on a SETI project at the Big Ear radio telescope of The Ohio State University.