|Source: Hubble/NASA - Click to Enlarge|
Jupiter's trademark Great Red Spot — a swirling storm feature larger than Earth — is shrinking. This downsizing, which is changing the shape of the spot from an oval into a circle, has been known about since the 1930s, but now these striking new NASA/ESA Hubble Space Telescope images capture the spot at a smaller size than ever before.
Jupiter's Great Red Spot is a churning anticyclonic
. It shows up in images of the giant planet as a conspicuous deep red eye embedded in swirling layers of pale yellow, orange and white. Winds inside this Jovian storm rage at immense speeds, reaching several hundreds of kilometres per hour.
Historic observations as far back as the late 1800s 
gauged this turbulent spot to span about 41 000 kilometres at its widest point — wide enough to fit three Earths comfortably side by side. In 1979 and 1980 the NASA Voyager fly-bys measured the spot at a shrunken 23 335 kilometres across. Now, Hubble has spied this feature to be smaller than ever before.
"Recent Hubble Space Telescope observations confirm that the spot is now just under 16 500 kilometres across, the smallest diameter we've ever measured," said Amy Simon of NASA's Goddard Space Flight Center in Maryland, USA.
Amateur observations starting in 2012 revealed a noticeable increase in the spot's shrinkage rate. The spot's "waistline" is getting smaller by just under 1000 kilometres per year. The cause of this shrinkage is not yet known.
"In our new observations it is apparent that very small eddies are feeding into the storm," said Simon. "We hypothesised that these may be responsible for the accelerated change by altering the internal dynamics of the Great Red Spot."
Simon's team plan to study the motions of these eddies, and also the internal dynamics of the spot, to determine how the stormy vortex is fed with or sapped of momentum.
This full-disc image of Jupiter was taken on 21 April 2014 with Hubble's Wide Field Camera 3 (WFC3).
Regarding its reddish color, Wikipedia clues us in
It is not known exactly what causes the Great Red Spot's reddish color. Theories supported by laboratory experiments suppose that the color may be caused by complex organic molecules, red phosphorus, or yet another sulfur compound. The GRS varies greatly in hue, from almost brick-red to pale salmon, or even white. The higher temperature of the reddest central region is the first evidence that the Spot's color is affected by environmental factors. The spot occasionally disappears from the visible spectrum, becoming evident only through the Red Spot Hollow, which is its niche in the South Equatorial Belt (SEB). The visibility of GRS is apparently coupled to the appearance of the SEB; when the belt is bright white, the spot tends to be dark, and when it is dark, the spot is usually light. The periods when the spot is dark or light occur at irregular intervals; as of 1997, during the preceding 50 years, the spot was darkest in the periods 1961–1966, 1968–1975, 1989–1990, and 1992–1993.
(What happened in 1967 that the spot became lighter??? But I digress...)
Edom is often compared to Mars for various reasons. Besides the fact that the word Edom is related to Adom - red, the color of Mars, Mars is named for the Roman (Edomite) god of war.
However, there is another strong comparison. If you take the concept of the שבעה כוכבי לכת (loosely, seven heavenly bodies), you have the following list, using the Rambam's order
|No.||Hebrew Name||English Name|
We see that מאדים - Mars is 5th in the order while צדק - Jupiter is 6th in the order. We could possibly say that they correspond to millennia and Sefirot. Mars corresponds to הוד (Hod), which corresponds to the 5th millennium (כל היום דוה, as Sefarim say). The 5th millennium was when Edom was at its greatest power. Jupiter corresponds to יסוד (Yesod), which corresponds to the current 6th millennium, and that is why it's called צדק, similar to צדיק, as in צדיק יסוד עולם.
Perhaps, when we entered the 6th millennium, Mars became irrelevant and Jupiter took over in relevancy. At that time, perhaps the Great Red Spot was formed on Jupiter, showing that Edom is still around and powerful in gas form. And it was massive then. The recent shrinkage of the Great Red Spot is then perhaps a sign that Edom is losing its grip in the world and will soon shrink to nothingness.
, talking about Edom:
אִם-תַּגְבִּיהַּ כַּנֶּשֶׁר, וְאִם-בֵּין כּוֹכָבִים שִׂים קִנֶּךָ--מִשָּׁם אוֹרִידְךָ, נְאֻם-יְהוָהThough thou make thy nest as high as the eagle, and though thou set it among the stars, I will bring thee down from thence, saith the LORD.
May it happen speedily in our days.