Meteor shower particles that are quickly blown away by solar radiation pressure). Recently, Peter Jenniskens has argued that most of our short-period meteor showers are not from the normal water vapor drag of active comets, but the product of infrequent disintegrations, when large chunks break off a mostly dormant comet. Examples are the Quadrantids and Geminids, which originated from a breakup of asteroid-looking objects, 2003 EH1 and 3200 Phaethon, respectively, about 500 and 1000 years ago. The fragments tend to fall apart quickly into dust, sand, and pebbles, and spread out along the orbit of the comet to form a dense meteoroid
December Festival Hurdle December Festival Hurdle The December Festival Hurdle, currently known by its sponsored title of the Ryanair Hurdle, is a Grade 1 National Hunt hurdle race in Ireland which is open to horses aged four years or older. It is run at Leopardstown over a distance of about 2 miles , and during its running there are eight hurdles to be jumped. The race is scheduled to take place each year during the Christmas Festival meeting in late December. Prior to 2013 the race was named the Istabraq Festival Hurdle in honour of Istabraq, who won it four times. The race