Hmm I dont know, I too tried the numerals first, but I think it is better to accept the word otherwise it is just easy scoring.. I failed five, I really should remember my moons better, cause missed two.. And never heard off enceladus and I knew which storm was referred too just not its name. Tbh the name is more of a description than a name, I did think of spot, but thought there might be an english name for it.
'Jupiter red spot' should be enough for the storm, I entered giant red spot etc. and missed out.
As mentioned '4' should be as good as 'four'