Mathematics is the queen of the sciences and arithmetic the queen of mathematics.
Carl Friedrich Gauss
Each generation has its few great mathematicians...and [the others'] research harms no one.
Python version: 3.5.1 (x86_64-linux-gnu)
A cookie is a small piece of data that a website asks your browser to store on your computer or mobile device. The cookie allows the website to "remember" your actions or preferences over time. learn more
Proxima Centauri, closest system (4,3 light-year). Three stars (G2, K1, M5). Component A is similar to the Sun (a G2 star).
On August 24, 2016, the discovery of an Earth-size exoplanet orbiting in the habitable zone of Proxima Centauri was announced.
The fastest outward-bound spacecraft yet sent, Voyager 1,
has covered 1/600th of a light-year in 30 years and is currently moving at 1/18,000th the speed of light.
At this rate, a journey to Proxima Centauri would take 80,000 years.
The troposphere is the lowest portion of Earth's atmosphere. The average depths of the troposphere are 20 km (12 mi) in the tropics,
17 km (11 mi) in the mid latitudes, and 7 km (4.3 mi) in the polar regions in winter. At middle latitudes,
tropospheric temperatures decrease from an average of 15 °C at sea level to about −55 °C at the tropopause.