erich karkoschka

Evidence of the great journey of Cassini
The recent Cassini spacecraft officially closed its 20-year journey of exploring the universe by crashing into Saturn's atmosphere and burning.
Discovering new features of Neptune
Erich Karkoschka, a scientist from the University of Arizona, USA, accurately calculated the self-motion time within a week of this giant planet is 15 hours 57 minutes 59 seconds,