Saturn’s lightning 10,000 times more powerful than Earth’s


I love being in the middle of a thunderstorm – being in the center of the light, noise and heavy rain is a really exhilarating experience. But new research from NASA’s Cassini probe makes me think that maybe Saturn would be an even better place to experience a massive storm.

Why? Saturn’s storms not only have thunderbolts thousands of times more powerful than Earth’s measly zaps of electricity, but the storms can also last for months on end. The current storm being observed by Cassini has been going on for over five months now – a record for the ringed planet.

Wikipedia Saturn’s huge size obviously explains why thunderstorms are so much bigger there than on Earth, but is that the only reason? Saturn, Jupiter and the other gassy planets are actually always bound to have more huge storms like this, because unlike our planet, their atmosphere is the planet, not just a thin layer on top of loads of rock.

Cassini’s discovered some other cool things about Saturn too – a 2000-mile wide storm near the South Pole that looked like a hurricane was discovered back in 2006, and of course Saturn’s many moons are proving to even more interesting than the giant planet itself.

That’s why it’s great news that NASA recently announced that funding for Cassini will continue until at least 2010 – hopefully even longer. Go Cassini!

Scientists discover how to make on-demand lightning

Wikipedia Back in the days of ancient Greece or Rome, if someone could magically generate lightning-on-demand they’d probably be hailed as a god. Until not too many years ago most people believed that lightning and the roaring thunder that follows were some sort of warning or punishment from the heavens.

Well now scientists in New Mexico have put an end to those theories – or at least they nearly have. By firing lasers into a thundercloud they just about managed to generate a bolt of lightning. They didn’t actually manage it because their techniques aren’t yet well enough developed, but they say they should be ready before too long.

It sounds pretty cool doesn’t it, lightning whenever and wherever you want it (although obviously it only works when you’ve got a thundercloud). So how did they do it? It sounds almost like science fiction: they shot laser beams up into thunderclouds, which caused a line of gas in the cloud to become ionized – that means it was given a charge.

Wikipedia Because lightning is essentially just a huge stream of charged particles, the line of particles that the laser created acted much like a lightning rod, and it directed the flash of lightning downward. It didn’t hit the ground in this experiment because the technique used was not powerful enough, but before long scientists should have mastered the technology.

Wikipedia It’s all very well being able to generate lightning, but as with so many experiments like this you just have to wonder, well, why? Actually, it could have some good uses. By knowing exactly when and where lightning is going to strike, scientists can do their research into this deadly killer a lot more easily. It’s also going to be useful for testing how lightning-resistant new planes and power lines are.

We’ve already discovered how to create rain (well at least sort-of), and now we can make lightning. It’ll be interesting to see where weather research takes us next in the decades ahead. I bet those scientists wish they lived in Ancient Rome – think of all the special treatment they’d get now as gods!

National Geographic has an excellent interactive page showing how lightning works.

Snowstorms in China… what about global warming?

Snow blankets a forest in China | Image: National Geographic

Beautiful yet deadly. China’s worst snow in 50 years has already killed more than 65 people and delayed hundreds of thousands who wanted to get back for their only holiday of the year, the Lunar New Year. But it has also created beautiful scenes like the one above – evidence of the extraordinary power of nature to both kill and amaze.

The obvious question is “I thought the climate was getting hotter – why so much snow?” Climate change is a highly complex process, and ‘global warming’ can sometimes be a misleading term for this. (Click here for an interactive map of global warming effects)

One of the most noticeable effects of global warming will be more extreme weather – think of 2007: the California wildfires, the worst flooding in England since the 18th century, the water shortage in the southern US… it’s rapidly becoming clear that we ourselves will be the ones affected as the effects of climate change unfold before our eyes.

So although this individual storm in China is probably not climate change-related, events like this are likely to become far more common throughout this century. Hurricanes, tornadoes, floods, wildfires – even without wanting to be too much of a scaremonger, I think it’s safe to say we’re in for one wild century.

Just some of the hundreds of thousands who have been trapped by the snowstorms | Image: National Geographic