WorldofScience

science

Carl Anderson, discoverer of positrons (anti-electrons), lecturing on elementary particles. The positron was the first evidence of antimatter and was discovered when Anderson allowed cosmic rays to pass through a cloud chamber and a lead plate.

![](https://m.stacker.news/66306)

Carl Anderson, discoverer of positrons (anti-electrons)

Construction_and_Engineering

Nikola Tesla holding a gas-filled phosphor-coated wireless light bulb which he developed in the 1890s, half a century before fluorescent lamps came into use. Published on the cover of the "Electrical Experimenter" in 1919.

![](https://m.stacker.news/66303)

Nikola Tesla with a wirele gasfilled light bulb decades before fluorescents 1919

Galileo's first moon drawings, 1609, after observing through his telescope.

Dr. Willem de Sitter and Albert Einstein discussing equations that provide the best available language for describing the universe seen as a whole, on a CalTech blackboard, Pasadena, c. 1932.

![](https://m.stacker.news/66282)

Dr. Willem de Sitter and Albert Einstein discussing equations

Marie Curie and Irène Joliot-Curie at the Radium Institute Paris France, in 1921

Pluto: 1994 vs 2019

The temperature in space is close to absolute zero.

PS Absolute zero is the lowest limit of the thermodynamic temperature scale, a state when enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvins 0 K (−273.15 °C; −459.67 °F).
![](https://m.stacker.news/65373)