Since a comet loses matter on each pass by the Sun, eventually it will be depleted to the point where it is no longer visible. Comets that approach the Sun have finite lifetimes. Given the typical sizes of comets and the typical rates at which they lose matter, astronomers have concluded ...
4.According to paragraph 3, the tails of a comet A. flow in the same direction as the radiation that produces them B. become straighter as the comet moves away from the Sun C. are pulled toward the Sun D. can become detached from the comet head if the solar winds are strong enough ...
像“the tail of a plane”(飞机的尾部),我们坐飞机的时候,从窗户看出去,就能看到飞机的尾巴那部分啦。还有“the tail of a comet”(彗星的尾部),彗星拖着长长的尾巴划过夜空,那景象简直太壮观了。 3、在一些习语里,“tail”也有独特的含义呢。比如“turn tail”,它的意思是“逃跑、溜走”。就像“ When ...
The meaning of TAIL is the rear end or a process or prolongation of the rear end of the body of an animal. How to use tail in a sentence.
Each ridge may be traced to a single stream, or 'jet' of disintegrating materials emanating from shifting areas on a comet's nucleus. A band of these jets, captured into planetary orbit, will land its debris in a unique manner. All debris will be laid down in a sheet perpendicular to ...
a.A long thin part on some kites that hangs down below the part that catches the wind to provide stability. b.The long stream of gas and dust that is illuminated and directed away from the head of a comet when it is close to the sun. ...
Tail end, the latter end; the termination; as, the tail end of a contest. [Colloq.] Tail joist. (Arch.) Same as Tailpiece. Tail of a comet (Astron.), a luminous train extending from the nucleus or body, often to a great distance, and usually in a direction opposite to the sun....
And its also worth noting that as comet A1 Siding Spring (see below) makes a close physical pass by Mars on October 19th, Comet Oukaïmeden makes a close apparent pass by Saturn as seen from our Earthly vantage point the evening before! To be sure, the dusk apparition of Comet Ouka...
It can be inferred from the passage that the nucleus of a comet is made up ofA.( dust and gasB.( ice and dustC.( hydrogen gasD.( electrically charged atoms 答案解析与讨论:点击查看 第2题:rEADing 5 "spEECh AnD writing" it is A wiDEly hElD misConCEption thAt writing is morE pErFECt ...
The Motion of Dust and Gas in the Heads of Comets with Type II Tails Photographs of Comet Bennett 1969i taken in the dust-scattered continuum reveal that the dust particles, leading to the formation of the type II tail, leav... K Wurm,A Mammano - 《Astrophysics & Space Science》 被引...