2005...
January 5 – Eris, the most massive known dwarf planet in the Solar System, is discovered by a team led by Michael E. Brown using images originally taken on October 21, 2003, at the Palomar Observatory.
January 12 – Deep Impact is launched from Cape Canaveral with the purpose of studying the comet Tempel 1.
January 14 – The Huygens spacecraft lands on Titan, the largest moon of Saturn.
January 20 – George W. Bush is inaugurated for a second term as President of the United States.
February 10 – North Korea announces that it possesses nuclear weapons as a protection against the hostility it feels from the United States.
April 23 – The first ever YouTube video is uploaded, titled Me at the zoo.
https://www.youtube.com/watch?v=jNQXAC9IVRwAugust 29 – Hurricane Katrina makes landfall along the U.S. Gulf Coast, causing severe damage and killing over a thousand people and dealing an estimated $108 billion in damage.
October 24 – Hurricane Wilma made landfall near Cape Romano.
December 31 – Another second is added, 23:59:60, to end the year 2005, the first time since 1998.