If you visit the Google home page, you will see a special doodle representing the Perseid meteor shower. The special meteor shower is expected to pass by earth today with about a 100 meteors per hour flying by and burning up in Earth's atmosphere. Very cool and exciting, which is why Google has a Perseids doodle for the special day.
Here is the Perseids Google Doodle:
Wikipedia explains the nature of such a shower:
The Perseids (pronounced /per-si-dis) are a prolific meteor shower associated with the comet Swift-Tuttle. The Perseids are so called because the point they appear to come from, called the radiant, lies in the constellation Perseus. The stream in this case is called the Perseid cloud and it stretches along the orbit of the Comet Swift-Tuttle. The cloud consists of particles ejected by the comet as it passes by the Sun.
I am a bit surprised to see Microsoft's Bing not doing something special with their home page today. Perhaps we will see a Perseids Meteor Shower background later today?