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| Skywatchers set for meteor shower | Skywatchers set for meteor shower |
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| Skygazers are preparing for the high point of the annual Perseid meteor shower. | Skygazers are preparing for the high point of the annual Perseid meteor shower. |
| The shower, which reaches its peak on Wednesday, occurs when the Earth passes through a stream of dusty debris from the comet Swift-Tuttle. | The shower, which reaches its peak on Wednesday, occurs when the Earth passes through a stream of dusty debris from the comet Swift-Tuttle. |
| As this cometary "grit" strikes our atmosphere, it burns up, often creating streaks of light across the sky. | As this cometary "grit" strikes our atmosphere, it burns up, often creating streaks of light across the sky. |
| The meteors appear to come from a point called a "radiant" in the constellation of Perseus - hence the name Perseid. | The meteors appear to come from a point called a "radiant" in the constellation of Perseus - hence the name Perseid. |
| "Earth passes through the densest part of the debris stream sometime on 12 August. Then, you could see dozens of meteors per hour," said Bill Cooke of Nasa's meteoroid environment office. | "Earth passes through the densest part of the debris stream sometime on 12 August. Then, you could see dozens of meteors per hour," said Bill Cooke of Nasa's meteoroid environment office. |
| No special equipment is required to watch the sky show. Astronomers say binoculars might help, but will also restrict the view to a small part of the sky. | No special equipment is required to watch the sky show. Astronomers say binoculars might help, but will also restrict the view to a small part of the sky. |
| The Perseids can appear in any part of the sky, but their tails all point back to the radiant in the constellation Perseus. | The Perseids can appear in any part of the sky, but their tails all point back to the radiant in the constellation Perseus. |
| Stargazers are advised to lie on a blanket or a reclining chair to get the best view. | Stargazers are advised to lie on a blanket or a reclining chair to get the best view. |
| PERSEID METEOR SHOWER The tails of the Perseids point back to a "radiant" in the constellation PerseusThey can appear anywhere in the skyComposed of dusty debris from Comet Swift-Tuttle | |
| Budding astronomers are being urged to take part in the first "Twitter Meteorwatch". Astronomers from around the world will be live-tweeting images of the meteors, as well as pictures of the Moon, Jupiter and other celestial objects. | Budding astronomers are being urged to take part in the first "Twitter Meteorwatch". Astronomers from around the world will be live-tweeting images of the meteors, as well as pictures of the Moon, Jupiter and other celestial objects. |
| The "48-hour Twitter marathon" will form part of the International Year of Astronomy 2009 (IYA2009). | The "48-hour Twitter marathon" will form part of the International Year of Astronomy 2009 (IYA2009). |
| NATIONAL TRUST'S SEVEN BEST UK SITES Black Down in SussexTeign Valley in DevonPenbryn Beach in WalesStonehenge Landscape in WiltshireWicken Fen National Nature Reserve in CambridgeshireMam Tor in DerbyshireFriar's Crag in Cumbria | |
| 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. | 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. |
| This year, light from the last quarter Moon will interfere significantly with the view. | This year, light from the last quarter Moon will interfere significantly with the view. |
| The UK's National Trust has published online guides to seven top Perseid viewing sites, including coastal spots, nature reserves and national parks. | |
| Jo Burgon, head of access and recreation at the Trust, said: "Light pollution from our towns and cities has increased so much in recent years, but head out to the countryside for the perfect place to explore the beauty of the night sky, away from the intrusive glow." | |
| The rock and dust fragments which cause the shower were left behind by Comet Swift-Tuttle when it last came near the Sun. | The rock and dust fragments which cause the shower were left behind by Comet Swift-Tuttle when it last came near the Sun. |
| The comet orbits the Sun once every 130 years and last swept through the inner Solar System in 1992. | The comet orbits the Sun once every 130 years and last swept through the inner Solar System in 1992. |
| Are you getting ready to watch the Perseid meteor shower? Send us your comments using the form below: | Are you getting ready to watch the Perseid meteor shower? Send us your comments using the form below: |
| Send your pictures to yourpics@bbc.co.uk or text them to 61124. If you have a large file you can upload here. | Send your pictures to yourpics@bbc.co.uk or text them to 61124. If you have a large file you can upload here. |
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