MUSHBALLS BY NUMBERS

one

Weight in kilograms

two-thirds

The amount of water contained in a mushball

one-third

The amount of ammonia contained in a mushball

10cm

Diameter of a mushball – roughly the size of a baseball

1989

When Voyager 2 flew by Neptune and Uranus

-90°C

Temperature at which mushballs start to form

50km

The extent the troposphere extends above the surface of Jupiter

Four

All of the Solar System’s gas giants are thought to experience mushballs

2016

Year Juno began orbiting Jupiter

Zero

Missions planned for Neptune and Uranus