1999 in science

The year 1999 in science and technology involved some significant events.

Aeronautics

February 27 – While trying to circumnavigate the world in a hot air balloon, Colin Prescot and Andy Elson set a new endurance record after being in their balloon for 233 hours and 55 minutes.
March 3-20 – Bertrand Piccard and Brian Jones successfully complete a non-stop circumnavigation of the world in a hot air balloon.

January 31 – A total penumbral lunar eclipse.
February 7 – Stardust is launched on a mission to collect samples of a comet coma, and return them to Earth.
February 11 – Pluto moves outside the orbit of Neptune, remaining there until 2231.
February 16 – Annular solar eclipse, visible from Australia.
July 20 – Mercury program: Liberty Bell 7 is raised from the Atlantic Ocean.
July 28 – Partial lunar eclipse, visible from Australia, eastern Asia, and western North America.
July 31 – NASA intentionally crashes the Lunar Prospector spacecraft into the Moon, thus ending its mission to detect frozen water on the Moon's surface.
August 11 – Total solar eclipse, visible from Europe, across the Middle East, and ending in India.
December 16 – The Beethoven Burst (GRB 991216) is one of the most powerful detected Gamma-ray bursts.
NASA loses two Mars probes, the Mars Climate Orbiter and the Mars Polar Lander.
The Subaru 8.3 m and Gemini North 8.1 m reflecting telescopes open at the Mauna Kea Observatory in Hawaii.
The Cetus Dwarf galaxy is discovered.
M–sigma relation first presented.

Elements 118 and 116 are claimed to be made for the first time; later retracted when results cannot be replicated.

March 26 – The Melissa worm attacks the Internet.
June – defines HTTP/1.1, the version of Hypertext Transfer Protocol in common use.
September 21 – David Bowie's Hours becomes the first complete music album by a major artist available to download over the Internet in advance of the physical release.
First working 3-qubit NMR computer demonstrated at IBM's Almaden Research Center. First execution of Grover's algorithm.
The term 'Web 2.0' is coined by Darcy DiNucci.
Probable date – First emojis introduced, in Japan.

January 25 – A 6.0 Richter scale earthquake hits western Colombia, killing at least 1,000.
August 17 – The 7.6 İzmit earthquake shakes northwestern Turkey with a maximum Mercalli intensity of IX, leaving 17,118–17,127 dead and 43,953–50,000 injured.

Boris Chertok publishes «Ракеты и люди», a history of the Soviet rocket program.

April 16 – Russell Foster and his team at Imperial College London publish their discovery of the non-rod, non-cone, intrinsically photosensitive retinal ganglion cells in the mammalian eye which provide input to the circadian rhythm system.
October – Huda Zoghbi demonstrates that Rett syndrome is caused by mutations in the gene MECP2.

January 19 – The first BlackBerry is released, using the same hardware as the Inter@ctive pager 950, and running on the Mobitex network.