Light can exert a force

Energy is carried from the sun to the earth or from an open fire to hand by electromagnetic waves. More surprisingly is the fact   that electromagnetic waves also transport linear momentum. This means that it is possible for electromagnetic waves to exert a force, and hence a radiation pressure, on an object, e.g. by shining light on it. Such forces must be small as we do not, after all, get pushed backwards when we raise a window blind and let in the sunlight. Radiation pressure is partly responsible for the way the tails of comets stream away from the Sun.

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Ball lightning

Ball lightning is the rarest form of lightning and looks like glowing globes .The  globes can range from size of a ping-pong ball to a sphere several feet in diameter.Ball lightning lets  out a strange hissing sound followed by (not always) a particularly loud thunder clap when the lightning disappears.Hydroelectric plants can often be visited rolling ball lightning if other atmospheric conditions are right.

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James Edgar

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New RASC Website Now On-line

On behalf of the Webteam and the IT Committee I'm pleased to inform you that our new website is now up and running. We've successfully migrated a great deal of content from our old CMS version to the latest and greatest. While there is still some work to be done we are ready to "go public" with our new site. Here are the highlights:

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Explore the Universe Certificate Recipient

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Charles Ennis

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Christopher Gainor

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Denis Grey

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History

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Certificate Programs

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