Passage Two: Questions 23-30
Hailey's comet has become the best 23 comet in history, but the information that has been gathered is only the beginning of what is needed to understand this comer, one of the most primitive bodies in the 24 system. During the recent appearance of Hailey’s comet, a research corps of over 1000 professional 25 gathered data around the world. The data revealed 26 new information. For the first time ever, European and Soviet spacecraft have photographed the comet’s 27. . The photographs now show the mass of dirty ice
and gas that makes up the comet’s center.
In spite of close-up photos revealing one of the oddest-Iooking objects in the solar system, comet scientists still can’t decide how fast Hailey’s nucleus spins. Some experts believe it spins once every 2.2 days, some determine the spin to be once in 7.4 days, and other scientists suggest
that the comet 28 both motions superimposed together.
Astronomers 29 Hailey each time it comes close enough to the earth, so that we can see the bright cloud of 30 dust and gas that forms its tail. It is easiest to get a clear look at the comet when it is far away from the sun so that its activity dies down.
【Group】24. (A) singular (B) solar (C) lunar (D) stellar