Asteroid Hunting

Many of you will have seen the video of the meteor that exploded into the atmosphere above Russia last week, and I would just like to offer an overview of the event from a practical scientific prespective.

The meteor was about 15 metres across, and as such too small to detect. As we all saw though a meteor of this size can do extensive damage. It weighed about 7000 metric tonnes, travelling at 18 Km per second and exploded at a height of between 15 and 20 Km. This is pretty close to the ground if you think that an aeroplane flies at about 10Km and we are certainly not dealing with somewhere where nothing happens.

The force of the explosion was about 30 times that of the Hiroshima bomb, a pretty devastating blow by all counts. We should think ourselves lucky that it did not happen over a major city.

Trees blown over after the 1908 impact

Trees blown over after the 1908 meteor impact

In 1908 in Tunguska also in Russia a much larger meteor hit. This one was about the size of the DA14 meteor that flew past Earth later on the same day last week, and it blew trees down over an area of about 2000 square Km. Once again it hit over Siberia so less damage than could have occurred, but if you think that the event of last week over Russia only threw out about 5% of the force of this one than we don’t need much imagination to envisage the possible catastrophe. Several photos are available around the net and I offer one above. There are also plenty of huge craters to see.

NASA have the Near Earth Program, and they have the mission of monitoring the many things that fly close to Earth.

It is not an easy job though as you might imagine, they use ground based telescopes so can only see something that is big enough to reflect enough light, and last week’s hit came directly in line with the sun, so practically impossible to see.

NASA has managed to identify 90% of near Earth asteroids that are more than 1 Km across, and something of this size might threaten life on Earth itself if it hit. There are more than a million near Earth asteroids however that are 20 metres across or more but  very few of these have been identified and mapped.

The B612 Project is hoping to put a telescope into Space before 2018 that will be able to spot something of that size, but until then they will go largely unseen.

Keeping on a related topic last May I put a post up about asteroid mining, and recently the BBC has carried some updates on this project.

It is currently a 2 horse race, but it seems very speculative. And I remember a song about horses of this type.

Advances in Computer Cooling Systems

A few months ago I wrote an article about electricity use in data storage centres, and I want to continue on that theme today. This week Intel announced the results of a year long experiment that involves immersing computers in mineral oil to cool them.

It turns out that the reason these centres use so much electricity is the need to cool the machinery. As this article points out some companies have had the brilliant idea of building their facilities in cold places, so that they can just leave the doors open or use cold seawater to cool the plants, but obviously this does not suit all business plans.

Intel have been immersing their machinery in mineral oil in an attempt to save on electricity. Oil is a better conductor of heat than air so works more efficiently. You just have to remove the fans from the casings and drop the machines in. At the end of this 1 year experiment they found no problems in the machinery due to the immersion. Report in the article linked above.

Computers submerged in mineral oil which acts as a cooling agent

Intel’s experimental oil cooling system

This certainly gives a whole new meaning to the idea of a think-tank.

An organization called Sandia have another idea called a fan-less heat sink. This is a rotating wheel covered in fins that cuts out the use of the fan. They claim that this system is also much more efficient than the old fan system and is not affected by dust as the centrifugal force generated during its use throws it all out. There is an article explaining it here and for a technical explanation see their company website.

If you want to go one step further how about laser cooling? Researchers at Nanyang Technological University have been working on this idea in the hope that they will be able to build microchips that actually cool themselves. Their press release talks about the end of compressors in fridges and air conditioners, a dramatic advantage in energy waste and an end to noisy fans. All published in this month’s Nature science journal.

If all of this has wet your appetite you could try to convert your old computer to a water cooling system. Rather expensive commercially available solutions are available but this blog demonstrates how you can do it all in your own home using just a few things you can buy at your local hardware store. I would recommend that you do not use the computer you are using now though and that you save anything you might want to see again onto another hard drive!

I take no responsibility for damage incurred.

Hackathon Season is Upon Us

The use of the term hacker used to be derogatory, conjuring up images of someone cackling like a Witch, hunched over a computer as they steal some poor unsuspecting fool’s bank details. This is changing though, and the present use of the word is much broader and less critical.

A couple of weeks ago I wrote a post about Aaron Swartz, and many see him as “a hacker for good”. He was greatly revered and respected in the Internet world and considered a programming genius by many.

Also today many Internet companies offer prizes to hackers who can break their security systems, so that they can then repair the weaknesses, all done more or less in secrecy obviously.

Here last week in Cambridge Massachusetts MIT held a Hackathon. The prize for the best “hack” was $1500 dollars, with plenty of runner’s up prizes too. And it is sponsored by Techfair, who organize a large business fair.

People from tech companies are invited to the hackathon to meet the ‘contestants’. It is in fact a job fair too, but as the website says don’t bring a CV, we just watch to see what you can do. There are tech talks and mini lectures, all above board as you can see from the website here.

A Hackathon

Inside a Hackathon

And this 20 hour marathon is neither the only nor the biggest hackathon in the USA. In January the Foursquare hackathon took place in New York City. The website has a link to all of the submitted hacks, and they are possibly nothing like you imagine. They are websites that can tell you how long you might have to wait in a certain restaurant, tell you NASDAQ values or help you influence the choice in music played around you, and that is to name just a few.

All this is organized with the help of Hacker League, as they say on the website you can “trust Hacker League to handle hackathon planning and organization” because they “power Hackathons”.

The biggest is in Pensylvania and is called PennApps (presumably after the University). Their January event attracted more than 450 students from 40 universities from all over the world, their prize being $4000 and a visit to Google HQ to demonstrate their work.

So the use of the word “hack” has clearly taken on a different meaning.

As many of you might know my work at the Bassetti Foundation is all about responsible innovation.  If we take case 1, writing code to steal bank details or destroy somebody’s reputation by getting into their email account, we might see this as irresponsible. But case 2, improving security, breeding entrepreneurs and innovation using the same skills and through the same actions by the same people, might be seen as much more responsible and in fact is promoted by organizations, businesses and universities.

It doesn’t look much like hacking to me though.