* Space has always existed: The universe and the vast emptiness we call space have been around for billions of years.
* Early observations: Humans have been looking up at the stars and planets for millennia, but those were early observations, not "discoveries" in the modern sense.
* The scientific revolution: The idea of space as a vast, empty expanse beyond Earth's atmosphere developed gradually throughout history, with contributions from scientists like Copernicus, Galileo, and Newton.
* Spaceflight: The first human-made object to reach outer space was Sputnik 1 in 1957, a major milestone.
So, while there isn't a single "discovery" year for space, 1957 marks a crucial point in our understanding and exploration of it.
