Explosive news of life on Jupiter’s erupting moon, and in Indonesia

While volcanic eruptions disrupt life in Indonesia, elsewhere in our solar system they might be making it interesting.

This column won’t be of much comfort to the thousands displaced by volcanic eruptions in Indonesia. Lava flows are reaching as far as five kilometres from Mount Sinabung, which has been erupting since September, and the Indonesian government has said that any settlements within three kilometres of the mountainside will be relocated permanently. But even if there is no human habitation in the area, we know that there will be much new life emerging in the shadow of the volcano.

This is what happened on the Japanese island of Nishinoshima. Created by a volcanic eruption 40 years ago, it is now home to four species of plant and plenty of insects.

Volcanoes are a great boon to biology. According to a paper published in this month’s edition of the journal Geology, volcanic eruptions and other side effects of the earth having a hot, molten interior are responsible for the vast range of life on our planet.

The evidence comes from zircons, crystals that are formed only in volcanic eruptions. Geologists have found a glut of zircons in rocks that formed just before the period biologists call the Cambrian Explosion. The Cambrian Explosion occurred 540 million years ago, when a huge number of new animals suddenly appeared. Most of the body forms of today were formed in this ten-million-year evolutionary spurt – after the zircons appeared. The conclusion? Volcanic eruptions are one of the earth’s vital signs: an indication that life is about to get interesting.

That is largely because eruptions throw huge amounts of carbon dioxide into the atmosphere. The warming effect this produces affects the climate and provides a change in conditions that favours the emergence of diversity. Put simply, the organisms that were suited to the old earth fall by the wayside, creating space for new life experiments.

That is especially fascinating given observations of one of Jupiter’s moons. The ice-world Europa has long been seen as a good potential home for extraterrestrial life. That candidacy just got much stronger: it was reported last month that astronomers using the Hubble Space Telescope to keep an eye on Europa have spotted evidence of volcanic activity.

Europa’s ice crust, which is thought to be a few kilometres thick, covers a watery ocean over 100 kilometres deep. Nobody knows whether life exists in that ocean, but if it does it would require a source of energy. As so little sunlight penetrates the ice crust, that would have to come from within. That is why the signs of intermittent plumes of vapour erupting from the ice have so excited hunters of extraterrestrial life: it suggests that some kind of life-giving volcanic energy is at work inside the icy moon.

We won’t find life on Europa any time soon. Though the plumes rise high enough that passing spacecraft could sample the vapour spurting from the ocean – and perhaps detect life within it – the next scheduled flyby of Europa will take place in 2031.

It is sobering to think that, if the astronomers’ conclusion is right, Europa is only the fourth body in the solar system to exhibit volcanism. The other three are its neighbouring moon Io, Saturn’s moon Enceladus and, of course, Planet Earth. These are very special places: volcanoes bring misery and death but they also usher in the possibility of complex biology. While volcanic eruptions disrupt life in Indonesia, elsewhere in our solar system they might be making it interesting.
 

More than 25,000 people have fled their homes following a series of eruptions and lava flows from Sinabung volcano in North Sumatra. Photo: AFP/Sutanta Aditya/Getty Images.

Michael Brooks holds a PhD in quantum physics. He writes a weekly science column for the New Statesman, and his most recent book is At the Edge of Uncertainty: 11 Discoveries Taking Science by Surprise.

This article first appeared in the 21 January 2014 issue of the New Statesman, The radicalism of fools

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PMQs review: Jeremy Corbyn bids for the NHS to rescue Labour

Ahead of tomorrow's by-elections, Corbyn damned Theresa May for putting the service in a "state of emergency".

Whenever Labour leaders are in trouble, they seek political refuge in the NHS. Jeremy Corbyn, whose party faces potential defeat in tomorrow’s Copeland and Stoke by-elections, upheld this iron law today. In the case of the former, Labour has already warned that “babies will die” as a result of the downgrading of the hospital. It is crude but it may yet prove effective (it worked for No to AV, after all).

In the chamber, Corbyn assailed May for cutting the number of hospital beds, worsening waiting times, under-funding social care and abolishing nursing bursaries. The Labour leader rose to a crescendo, damning the Prime Minister for putting the service in a “a state of emergency”. But his scattergun attack was too unfocused to much trouble May.

The Prime Minister came armed with attack lines, brandishing a quote from former health secretary Andy Burnham on cutting hospital beds and reminding Corbyn that Labour promised to spend less on the NHS at the last election (only Nixon can go to China). May was able to boast that the Tories were providing “more money” for the service (this is not, of course, the same as “enough”). Just as Corbyn echoed his predecessors, so the Prime Minister sounded like David Cameron circa 2013, declaring that she would not “take lessons” from the party that presided over the Mid-Staffs scandal and warning that Labour would “borrow and bankrupt” the economy.

It was a dubious charge from the party that has racked up ever-higher debt but a reliably potent one. Labour, however, will be satisfied that May was more comfortable debating the economy or attacking the Brown government, than she was defending the state of the NHS. In Copeland and Stoke, where Corbyn’s party has held power since 1935 and 1950, Labour must hope that the electorate are as respectful of tradition as its leader.

George Eaton is political editor of the New Statesman.