B

Beijing’s sky watchers will see with their own eyes a bright com- et (彗星) all night long. Comet e/1996 b2(Hyakutake) was first observed by Hyakutake, a Japanese (业余的) astronomer (天文学家) , on January 30, 1996. It can be seen with the naked eyes (肉眼) over China, Europe and other northern areas at night through the last week of March and first ten days of April. On march 25, it was closed to the earth and the sun. What is more exciting is that there will be two more rare s in the sky, it is predicted (预言) that another comet, HaleBopp, found on July 23, 1995, by Americans Alan Hale and Thomas Bopp, is expected to pass over the northern part of Heilongjiang province in March 1997. The comet, estimated to be 10×15 kilometres in size, will not return for 3 000 years. What is even more rare is that a total solar eclipse (日蚀) is expected to occur on March 9, 1997, over Mongolia, Siberia and northern Heilongjiang province. When the sky turns dark, people should be able to see the eclipse and the bright comet HaleBopp at the same time. An observation (观察,评论) trip to Mohe, Heilongjiang Province, is being organized for the March 1997 sky s, as well as a nationwide astrophoto competition (竞赛).

Beijing sky watchers will be excited because ______.