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In 1977, the twin spacecraft Voyager 1 and Voyager 2 
left the Earth for their bold mission of discovery.

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“The Grand Tour” program gave humanity 
its first close-up view of the outer planets...

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Jupiter
Its Great Red Spot is a storm
that’s been churning for centuries.

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Saturn
Its rings are made of particles as 
small as sand to as big as a house.

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Uranus
It’s the only planet that 
rotates on its side.

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Neptune
Its winds blow as fast as
1,300 miles per hour.

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Four decades later, the Hubble Space Telescope
is working on a “grand tour” of its own.

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Hubble’s Outer Planets Atmospheres 
Legacy program is looking closely at
these gas giants every year.

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Hubble's yearly observations track subtle changes 
in their atmospheres over a regular time period...

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...giving us a better understanding of how they evolve.

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Even at nearly 3 billion miles from the outer planets,
Hubble captured their images in great detail…

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…enough to see variations in their atmospheres.

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JUPITER
Hubble’s 2021 images of Jupiter track the 
ever-changing landscape of its turbulent atmosphere, 
where several new storms are making their mark.

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SATURN
This new look at Saturn shows rapid 
and extreme color changes in the bands 
of the planet’s northern hemisphere.

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URANUS
The increase in ultraviolet radiation 
absorbed from the Sun seems to be 
causing the polar region to brighten.

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NEPTUNE
A storm discovered on Neptune in 2018 has reversed 
direction and is moving north. This new “dark spot” is visible
in this image, along with a darkened northern hemisphere.

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Thanks to Hubble’s watchful eye, these gas giants 
will continue to provide us with clues to their evolution.

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