The year 1999 CE in science and technology included many events, including those below.

See also: 1998 in science, other events of 1999, 2000 in science and the list of years in science.

Table of contents
1 Aeronautics
2 Astronomy and space exploration
3 Biology
4 Computer science
5 Geology
6 Awards
7 Births
8 Deaths

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 a hot air balloon for 233 hours and 55 minutes.
  • March 3 - Bertrand Piccard and Brian Jones begin their attempt to circumnavigate the world in a hot air balloon without stopping. Their journey ended in success on March 20.

Astronomy and space exploration

Biology

Computer science

Geology

Awards

Births

Deaths