Editing 1999 in science (section)

==Astronomy and space exploration==
[[File:Solar eclipse 1999 4.jpg|thumb|Total solar eclipse of August 11, viewed from France]]
* January 31 – [[January 1999 lunar eclipse|A total penumbral lunar eclipse]].
* February 7 – ''[[Stardust (spacecraft)|Stardust]]'' is launched on a mission to collect samples of a [[comet]] [[coma (cometary)|coma]], and return them to Earth.
* February 16 – [[Solar eclipse of February 16, 1999|Annular solar eclipse]], visible from Australia.
* July 20 – [[Mercury program]]: ''[[Liberty Bell 7]]'' is raised from the Atlantic Ocean.
* July 28 – [[July 1999 lunar eclipse|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 – [[Solar eclipse of August 11, 1999|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 (telescope)|Subaru]] 8.3 m and [[Gemini telescope|Gemini North]] 8.1 m [[reflecting telescope]]s open at the [[Mauna Kea Observatory]] in Hawaii.
* The [[Cetus Dwarf]] galaxy is discovered.
* [[M–sigma relation]] first presented.<ref>{{cite book|first=David|last=Merritt|author-link=David Merritt|editor1-first=F.|editor1-last=Combes|editor2-first=G. A.|editor2-last=Mamon|editor3-first=V.|editor3-last=Charmandaris|chapter=Black holes and galaxy evolution|title=Dynamics of Galaxies: From the Early Universe to the Present|volume=197|series=Publications of the [[Astronomical Society of the Pacific]]|pages=[https://archive.org/details/xvthiapmeetingdy0197iapm/page/221 221–232]|year=1999|isbn=978-1-58381-024-8|bibcode=2000ASPC..197..221M|arxiv=astro-ph/9910546|chapter-url=https://archive.org/details/xvthiapmeetingdy0197iapm/page/221}}</ref>