There is a possibility of catching a dazzling treat on Tuesday and Wednesday, (11th and 12th August, 2009), with the peak of the annual Perseid meteor shower if weather permits. Meteors are bits of dust or rock that collide with Earth's atmosphere and heat up gas particles to produce a glowing trail. A handful of meteors can be seen each hour on any clear night, but during a meteor shower dozens may be visible.
The Perseid shower occurs each year when the Earth passes through a stream of debris shed by the comet Swift-Tuttle, which orbits the sun once every 130 years or so and last passed through the inner solar system in 1992.
The best time to catch the shower may be around 4:00 a.m. on August 12, when meteor numbers may get a slight boost as the Earth passes by an additional stream of debris left by the comet in 1610. On a clear night, an average of 60 meteors can be seen per hour close to the Perseids' peak. This year, the number may be lower because the moon, which is approaching its last quarter, will rise at about the same time as the shower is expected to begin. Every evening this week, the shower should start around 11 p.m. local time as the Perseus constellation rises, and the number of visible meteors should increase as the evening progresses to peak before dawn.
The meteors will appear all over the sky, so the best strategy for viewing the shower is to lie down and stare at as large a patch of sky as possible. Observers will want to point their gaze away from the moon to reduce its effect on night vision.
Although the best Perseid viewing is in the northern hemisphere, some viewers just south of the equator may also be able to catch a glimpse.
In the UK, the best times to see the Perseids are likely to be on the morning of 12 August before dawn and from late evening on the 12th through to the early hours of the 13 August.
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