On 5 March 1979, Voyager 1 made its closest approach to Jupiter. What it discovered astounded navigators at the Jet Propulsion Laboratory in California. Not least of all astronomer Linda Morabito, who had been analysing an image taken by the spacecraft and saw a puzzling feature that turned out to be a volcanic plume off the limb of Io. It was 270 kilometres (170 miles) tall, spewing sulphur into the airless sky with great ferocity. This volcano came to be known as Pele, after the Hawaiian fire goddess, and its discovery was hugely significant: it was the first time that an erupting volcano had been found anywhere other than Earth.
It wasn’t the first time that alien volcanoes had caught the imagination. Missions to the Moon had uncovered basalt samples some 3.3 billion years old, and Apollo 15 landed close to Hadley Rille, an immense groove on the Moon 1.5 kilometres (0.9 miles) wide and 300 metres (984 feet) deep. This groove likely originated as a lava tube whose roof collapsed. The unmanned Mariner 9 highlighted a varied Martian terrain in 1977 which had huge volcanoes, including the mammoth Olympic Mons. Yet these discoveries were all completely extinct.
Io proved to be a swirl of colours thanks to a thin atmosphere laden with sulphur, and was showing signs of being the most geologically active body in the Solar System: more than 150 active volcanoes – of more than 400 in total – have been discovered there. Moons Enceladus and Triton also have active volcanoes. Venus, too, as well as the Jovian moon Europa. “Although we have volcanoes on Earth, you have to study somewhere different to understand the big picture,” says Dr Rosaly Lopes of NASA’s Jet Propulsion Laboratory.
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Denne historien er fra Issue 134-utgaven av All About Space UK.
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15 AUTUMN STARGAZING TARGETS
Go on a night-sky treasure hunt as the brighter evenings give way to the cooler months
MYSTERIES OF THE UNIVERSE WHY IS VENUS SO DRY?
A new study reckons the answer lies high in the Venusian atmosphere
WHEN BLACK HOLES TURN WHITE
Can bouncing black holes help physicists find the ultimate theory of everything?
THE MOON'S THIN ATMOSPHERE IS MADE BY CONSTANT METEORITE BOMBARDMENT
While the solar wind also contributes to the atmosphere, meteorites are the main culprit
INTERSTELLAR TRAVEL AND HOW TO BECOME A SPACE TOURIST
Having explored much of the Solar System, attention is now turning to the stars beyond
NASA'S PERSEVERANCE ROVER FINDS POSSIBLE SIGNS OF ANCIENT RED PLANET LIFE
Further analysis is needed, but a rock contains potential evidence that life once existed on Mars in the distant past
A NASA TELESCOPE MAY HAVE FOUND ANTIMATTER ANNIHILATING IN POSSIBLY THE BIGGEST EXPLOSION SINCE THE BIG BANG
The massive explosion was captured in 2022
Jameel Janjua "This is how we get to Mach 3”
Jameel Janjua made it to the bitter end in a Canadian government astronaut selection in 2009, but wasn't chosen. He found a different path to space through Virgin Galactic
BOEING NEEDS TO IMPROVE QUALITY CONTROL ON THE SLS MOON ROCKET
The NASA Inspector General's report finds serious quality-control issues affecting the upgraded version and expects cost overruns and delays
DARK ENERGY
THE MOST DOMINANT FORCE IN THE UNIVERSE IS ALSO ITS MOST MYSTERIOUS AND MOST UNANTICIPATED