Warum ist Pluto kein Planet mehr?
Quellen & Links:
Definition of a planet in the Solar System (IAU.org)
What is a planet? (NASA.gov)
Pluto-Daten (ESA.int)
Astronomers Expel Pluto From The Planetary Club (TheGuardian.com)
SolarStory.net
First Image of A Black Hole (ESO.org)
NASA Makes History With Closest Flyby of Pluto (ScienceAlert.com)
Gravitational Waves Have Been Detected, Einstein Was Right (ScienceAlert.com)