Since this flyby was the Solar Orbiter's first tryst with Venus, the team wasn't what to expect and will take a few days to dig into the data the instruments gathered.
Voyager 1 entered interstellar space in 2012, while Voyager 2 finally crossed the boundary marking the beginning of outer space in November 2018.
To study the boundary of interstellar space, scientists studied cosmic rays moving towards Earth from different parts of the galaxy.
The planet was named Ultima Thule after a mythical European land that is beyond the borders of the known world.
The Voyagers spacecrafts are still going strong, although both will run out of power and fall silent within five years.
NASA is prepping an additional mission, IMAP, for launch in 2024 to capitalise on Voyagers’ findings.
NASA will launch a new mission to learn more about the cosmic rays in the heliosphere, a magnetic bubble surrounding and protecting our solar system.