Tuesday, March 21, 2017

Uranus and Neptune

I received this nice postcard with views of two planets:  Uranus and Neptune.

Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. Uranus is similar in composition to Neptune, and both have different bulk chemical composition from that of the larger gas giants Jupiter and Saturn. For this reason, scientists often classify Uranus and Neptune as "ice giants" to distinguish them from the gas giants.  It is the coldest planetary atmosphere in the Solar System, with a minimum temperature of −224 °C. The interior of Uranus is mainly composed of ices and rock.

Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth and slightly larger than Neptune. Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 astronomical units (4.50×109 km).

Marianne, issued on 15.07.2013.
Joint issue with Republic of Korea, issued on 06.06.2016.

Thank you Alexia!

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