Today, in space records we have the first ever discovered pulsar. For those who don’t know, pulsars are stars. Stars emit radio signals and astronomers can spot these radio signals.
Today, in space records we have the first Earth-like planet ever discovered. People were looking for Earth-like planets since they first invented the telescope (maybe even earlier). But only in 2011 (December 5th) the discovery of such a planet was first announced.