Space

Stunning snaps from Hubble's latest grand tour of the outer solar system

Stunning snaps from Hubble's l...
Hubble has snapped stunning new images of the outer solar system planets as part of the annual OPAL program
Hubble has snapped stunning new images of the outer solar system planets as part of the annual OPAL program
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Hubble has snapped stunning new images of the outer solar system planets as part of the annual OPAL program
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Hubble has snapped stunning new images of the outer solar system planets as part of the annual OPAL program
Hubble's new image of Jupiter, taken as part of the OPAL program for 2021
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Hubble's new image of Jupiter, taken as part of the OPAL program for 2021
Hubble's new image of Saturn, taken as part of the OPAL program for 2021
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Hubble's new image of Saturn, taken as part of the OPAL program for 2021
Hubble's new image of Uranus, taken as part of the OPAL program for 2021
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Hubble's new image of Uranus, taken as part of the OPAL program for 2021
Hubble's new image of Neptune, taken as part of the OPAL program for 2021
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Hubble's new image of Neptune, taken as part of the OPAL program for 2021
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Every year, the Hubble Space Telescope conducts a grand tour of the outer solar system planets, checking their turbulent atmospheres for changes in weather, storms, clouds and colors. This year’s shots are now in, revealing a few surprises.

Jupiter, Saturn, Uranus and Neptune are the giant planets that lurk in the solar system’s suburbs. As big soupy balls of gas and ice, the colors and patterns on their surfaces constantly change, driven by dynamic forces that aren’t entirely understood.

So Hubble takes new snaps every year, as part of the Outer Planets Atmospheres Legacy (OPAL) program, to watch how things evolve over time. NASA has now released the 2021 images, taken in September and October, showing some intriguing evolution since last year’s visit.

As usual, the most striking feature of Jupiter is the Great Red Spot, a storm bigger than Earth that’s been raging for centuries. But what caught the attention of astronomers is the deep orange band around the equator, which is normally a cloudy white but for the last few years has appeared darker. The team had expected it to be fading back to white by now, but it’s more vibrant than ever.

Hubble's new image of Jupiter, taken as part of the OPAL program for 2021
Hubble's new image of Jupiter, taken as part of the OPAL program for 2021

North of that, several brand new storms are brewing, visible as deep red dots within a pale band of clouds. The team says that cloud structures from deep within the planet can be seen in these spots.

Over on Saturn, the huge hexagonal storm at the north pole is once again visible, after being tricky to spot in 2020’s photo. As fall descends in the planet’s northern hemisphere, the colors are changing rapidly, with clear bands circling the gaseous world.

Hubble's new image of Saturn, taken as part of the OPAL program for 2021
Hubble's new image of Saturn, taken as part of the OPAL program for 2021

The southern hemisphere is emerging from winter, which can still be seen as a pale blue region peeking out from beneath the rings.

Uranus is a marvelous marble this year, sporting a bright white cap on the north pole and a sharp ring of blue around the middle. The strange effect seems to be due to increased ultraviolet radiation from sunlight as the northern hemisphere enjoys its springtime, but the astronomers aren’t sure if that’s changing the opacity of the methane in the atmosphere or if there’s some other variation in the aerosol particles there.

Hubble's new image of Uranus, taken as part of the OPAL program for 2021
Hubble's new image of Uranus, taken as part of the OPAL program for 2021

The border between the blue and white regions has remained stable at a latitude of 43 degrees for a few years, which may suggest a strong jetstream has formed there.

And the final stop on the grand tour is Neptune. This year’s weather shows clear-blue skies with very few white clouds visible. There is however a huge, dark storm visible in the northern hemisphere, towards the upper left of the image.

Hubble's new image of Neptune, taken as part of the OPAL program for 2021
Hubble's new image of Neptune, taken as part of the OPAL program for 2021

Discovered in 2018, this storm had been moving towards the equator for the last few years, but has recently reversed course. Another dark circle can be seen around the south pole of the planet.

Studying how these worlds evolve over the years can not only tell astronomers a lot about them, but can also inform interpretations of newfound planets around distant stars.

A closer look at each planet can be seen in the video below.

Hubble’s Grand Tour of the Outer Solar System

Source: NASA

View gallery - 5 images
3 comments
3 comments
annevance
These pictures are really stunning. But I always wonder what we are looking at as far as shape.
Is the perfect circle the result of the shape of the lens zoomed in on the surface and do we see only a part of the total surface or do we see the whole body in the universe?Cause that would mean that all the planets would have the same ball like shape.
Dan_of_Reason
Significantly low Sunspot activity could account for some of these phenomenon, particularly to cooling.
eMacPaul
@annevance, these planets are hundreds of millions of miles away, so it's basically a parallel view. These picture shows pretty much a straight on view of half of each planet, there's no zoom distortion here.