Aurora on Uranus
This is a composite image of Uranus by Voyager 2 and two different observations made by Hubble -- one for the ring and one for the auroras. Credit: ESA/Hubble & NASA, L. Lamy / Observatoire de Paris

A stunning composite of planet Uranus created using images captured by Hubble and Voyager 2 has been released recently.

The first ever auroras on Uranus were spotted in 2011 using the NASA/ESA Hubble Space Telescope. Subsequently in 2012 and 2014, a team led by an astronomer from Paris Observatory took a second look at the auroras using the ultraviolet capabilities of the Space Telescope Imaging Spectrograph (STIS) installed on Hubble.

Astronomers tracked the interplanetary shocks caused by two powerful bursts of solar wind traveling from the sun to Uranus, then used Hubble to capture their effect on Uranus’ auroras — and found themselves observing the most intense auroras ever seen on the planet.

By watching the auroras over time, they collected the first direct evidence that these powerful shimmering regions rotate with the planet. They also re-discovered Uranus’ long-lost magnetic poles, which were lost shortly after their discovery by Voyager 2 in 1986 due to uncertainties in measurements and the featureless planet surface.

The image embedded above is a composite image of Uranus created using images captured by Voyager 2 and two different observations made by Hubble — one for the ring and one for the auroras.

Ever since Voyager 2 beamed home spectacular images of the planets in the 1980s, planet-lovers have been hooked on auroras on other planets. Auroras are caused by streams of charged particles like electrons that come from various origins such as solar winds, the planetary ionosphere, and moon volcanism. They become caught in powerful magnetic fields and are channeled into the upper atmosphere, where their interactions with gas particles, such as oxygen or nitrogen, set off spectacular bursts of light.

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