May 25

240 BC – First recorded perihelion passage of Halley's Comet.
1961 – US President John F. Kennedy announces his goal to initiate a project to put a "man on the moon" before the end of the decade.
1977 – Star Wars (retroactively titled Star Wars: Episode IV – A New Hope) is released in theaters.
2008 – NASA's Phoenix lander touches down on Mars to search for environments suitable for water and microbial life.
2012 – The SpaceX Dragon 1 becomes the first commercial spacecraft to successfully rendezvous and berth with the International Space Station.