2019 in science

revised definitions of the SI base units, adopted at the 26th General Conference on Weights and Measures (CGPM), that came into force on 20 May 2019

solar eclipse

solar eclipse

lunar eclipse

solar eclipse

overview of scientific achievements (including inventions and discoveries) of the year 2019

GW190521 (initially S190521g) was a gravitational wave signal resulting from the merger of two black holes. It was possibly associated with a coincident flash of light; if this association is correct, the merger would have occurred near a third supermassive black hole. The event was observed by the LIGO and Virgo detectors on 21 May 2019 at 03:02:29 UTC, and published on 2 September 2020. The event had a Luminosity distance of 17 billion light years away from Earth, within a 765 deg2 area towards one of two roughly antipodal areas of the sky, one centered around Coma Berenices and the oth

island in Tonga

small meteor that exploded near the Kamchatka Peninsula on December 2018

Lunar Eclipse in July 2019

2019 report by the United Nations on mass extinction

intergovernmental report on climate change

IPCC 2019 report

overview of the events of 2019 in climate change

In particle physics, the odderon corresponds to an elusive family of odd-gluon states, dominated by a three-gluon state. When protons collide elastically with other protons or with anti-protons at high energies, gluons are exchanged. Exchanging an even number of gluons is a crossing-even part of elastic proton–proton and proton–antiproton scattering, while odderon exchange (i.e. exchange of odd number of gluons) corresponds to a crossing-odd term in the elastic scattering amplitude. In turn, the odderon's crossing-odd counterpart is the pomeron.

star in the constellation Scorpius

Wikipedia list article