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Thursday, August 12, 1999 Published at 09:44 GMT 10:44 UK

Meteors to shower Earth


Meteors to shower Earth
By BBC News Online Science Editor Dr David Whitehouse

For most skywatchers outside the path of Wednesday's total solar eclipse, the best astronomical show should occur a day and a half later, on Thursday, 12 August, and Friday, 13 August.

That is when the annual Perseid meteor shower reaches its peak with 50 to 150 shooting stars burning up in the Earth's atmosphere every hour.


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In recent years, the spectacular October Leonid meteors have attracted considerable attention, but historically the Perseids are the best known, and usually the most rewarding, of all meteor showers.

This year should be a good one for viewing Perseids. The shower's maximum takes place on 12 August, just one day after the new moon. This means the sky will be dark and the meteors easier to spot.

Like most meteor showers, the Perseids are caused by comet debris. Comets are flying mountains of rock and ice and traverse the inner Solar System.

Comet tails

They are warmed by the Sun that causes ice to evaporate and produces their familiar tails.

Comet tails are made of tiny pieces of unmelted ice, dust and rock ejected from the comet's nucleus. When Earth encounters these particles on its journey around the Sun, they strike the atmosphere and burn up. These show up as bright streaks across the sky that can last for several seconds.

Most of these shooting stars are caused by meteoroids about the size of a grain of sand, but much less dense.

The meteors radiate from the constellation of Perseus. For northern-hemisphere observers at latitudes higher than about 35 degrees, the constellation never sets below the horizon.

Unfortunately the Perseids are not a good shower for skywatchers south of the equator.


Sci/Tech Contents

Relevant Stories

Sound of shooting stars (12 Aug 99 | Sci/Tech)
Clouds ruin meteor night (09 Oct 98 | Sci/Tech)
Scientists warn of meteor storm (10 Jun 98 | Sci/Tech)

Internet Links

Perseids background
International Meteor Organisation
Wally Pacholka's astropics
The Leonids
Perseids Live.com

The BBC is not responsible for the content of external internet sites.

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