Astronomers have discovered a charming coincidence of mathematics in the heavens: An exoplanet that orbits its star every 3.14 days. The Earth-sized planet has been dubbed the “pi Earth” due to its orbiting period being close to the mathematical constant of pi (π).
Technically known as K2-315b, the planet has a radius 95% that of Earth’s and orbits a cool star that is much smaller than our sun, at about one-fifth of the size. A year there lasts only a few days as it orbits very close to its star, moving at a wild speed of 181,000 miles per hour.
“The planet moves like clockwork,” said lead author Prajwal Niraula, a graduate student at the Massachusetts Institute of Technology, in a statement.