Orbiting Saturn lies a quiet enigma - Rhea, the second-largest of its moons. Discovered in 1672 by Giovanni Cassini, Rhea has ice cliffs, bizarre internal structures, and an unexplained absence ...

Astronomers concluded it is not the same and that Cassini's spot disappeared in 1708. Jennifer Ouellette – Jun 24, 2024 1:36 pm | 81 Enhanced Juno image of Jupiter’s Great Red Spot in 2018.

Researchers studying the origin of Jupiter's Great Red Spot suspect it's not the same storm observed by Cassini in 1665. Instead, this Great Red Spot likely formed at least 190 years ago.

In 1665, Italian astronomer Giovanni Cassini observed a giant dark spot on Jupiter, which he called the "Permanent Spot." (English scientist Robert Hooke might've discovered it a year earlier, in ...