Berg had been watched by astronomers since before Uranus' 2007 equinox and it may have even dated back to the Voyager 2 visit. After migrating around the planet and changing in size and strength several times, Berg dissipated in 2009.
NEWS: Trojan Ahoy! Uranus Has a Plus-One
The biggest of the new storms is even larger than Berg, likely extending high into the planet's troposphere, and could become a similarly long-lived feature on Uranus.
"Even after years of observing, a new picture of Uranus from Keck Observatory can stop me in my tracks and make me say Wow!," said Heidi Hammel, a member of the observing team.
So even though it doesn't get mentioned all that often, Uranus can still hold a few surprises! (And please re-read the first sentence.)
Discovered in 1781, Uranus is the seventh planet in our solar system. At the time of the Keck observations Uranus was 19.51 AU away, which equates to a little over 1.813 billion miles (2.9 billion km). It orbits the sun once every 84 years.