You may not know this, but today is the first anniversary since we discovered the planet Neptune. That’s right, Neptune was discovered exactly one year ago today…
One Neptunian year that is – one complete orbit around the Sun by the planet – which takes 164.79 Earth years. The planet was discovered on September 23, 1846, and today it is back in the same location with respect to the Sun for the first time.
Neptune is the eighth and farthest planet from the Sun (now that Pluto has been taken out back and hit on the head), the fourth-largest planet (by diameter), and orbits the Sun at a distance 30 times that of Earth.
The image above was taken in 1989 by More at io9.
