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| Unknown | 1992-09-25 | 40.3 KB |
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|00000050| 44 65 63 65 6d 62 65 72 | 20 31 36 2c 20 31 39 38 |December| 16, 198|
|00000060| 35 01 01 53 43 49 45 4e | 43 45 01 01 47 72 65 65 |5..SCIEN|CE..Gree|
|00000070| 74 69 6e 67 20 48 61 6c | 6c 65 79 27 73 20 43 6f |ting Hal|ley's Co|
|00000080| 6d 65 74 0d 0a 0d 0a 0d | 0a 41 6c 6c 20 65 79 65 |met.....|.All eye|
|00000090| 73 20 61 6e 64 20 61 20 | 66 6c 6f 74 69 6c 6c 61 |s and a |flotilla|
|000000a0| 20 6f 66 20 73 70 61 63 | 65 63 72 61 66 74 20 66 | of spac|ecraft f|
|000000b0| 6f 63 75 73 20 6f 6e 20 | 74 68 65 20 63 65 6c 65 |ocus on |the cele|
|000000c0| 73 74 69 61 6c 0d 0a 63 | 65 6c 65 62 72 69 74 79 |stial..c|elebrity|
|000000d0| 0d 0a 0d 0a 0d 0a 46 6f | 72 20 6d 6f 72 65 20 74 |......Fo|r more t|
|000000e0| 68 61 6e 20 74 68 72 65 | 65 20 64 65 63 61 64 65 |han thre|e decade|
|000000f0| 73 2c 20 61 73 20 74 68 | 65 20 66 72 6f 7a 65 6e |s, as th|e frozen|
|00000100| 20 6d 61 73 73 20 68 75 | 72 74 6c 65 64 20 61 6c | mass hu|rtled al|
|00000110| 6f 6e 67 0d 0a 69 74 73 | 20 6c 6f 6e 65 6c 79 20 |ong..its| lonely |
|00000120| 70 61 74 68 2c 20 74 68 | 65 20 64 69 73 74 61 6e |path, th|e distan|
|00000130| 74 20 73 74 61 72 20 68 | 61 64 20 67 72 6f 77 6e |t star h|ad grown|
|00000140| 20 62 69 67 67 65 72 20 | 61 6e 64 20 62 72 69 67 | bigger |and brig|
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|00000160| 63 6b 6e 65 73 73 20 6f | 66 20 73 70 61 63 65 2e |ckness o|f space.|
|00000170| 20 4e 6f 77 20 74 68 65 | 20 69 63 79 20 77 61 79 | Now the| icy way|
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|00000220| 68 65 20 73 74 61 72 2c | 20 74 68 65 20 61 70 70 |he star,| the app|
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|000002b0| 74 6f 20 67 6c 6f 77 2e | 0d 0a 0d 0a 46 6f 72 20 |to glow.|....For |
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|000003c0| 4f 62 73 65 72 76 61 74 | 6f 72 79 20 6e 65 61 72 |Observat|ory near|
|000003d0| 20 54 75 63 73 6f 6e 20 | 6f 6e 65 20 6e 69 67 68 | Tucson |one nigh|
|000003e0| 74 20 6c 61 73 74 20 6d | 6f 6e 74 68 2c 20 73 65 |t last m|onth, se|
|000003f0| 76 65 72 61 6c 0d 0a 6c | 61 72 67 65 20 74 65 6c |veral..l|arge tel|
|00000400| 65 73 63 6f 70 65 73 20 | 74 72 61 63 6b 65 64 20 |escopes |tracked |
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|00000570| 61 20 70 61 74 63 68 20 | 6f 66 20 73 6b 79 2e 0d |a patch |of sky..|
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|000037b0| 20 61 6e 64 20 74 68 65 | 20 72 65 73 74 20 61 20 | and the| rest a |
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|000039e0| 20 74 6f 20 74 68 65 20 | 73 75 6e 20 77 69 6c 6c | to the |sun will|
|000039f0| 0d 0a 64 65 74 65 72 6d | 69 6e 65 20 69 74 73 20 |..determ|ine its |
|00003a00| 6c 69 66 65 2d 73 70 61 | 6e 2e 20 41 73 74 72 6f |life-spa|n. Astro|
|00003a10| 6e 6f 6d 65 72 73 20 65 | 73 74 69 6d 61 74 65 20 |nomers e|stimate |
|00003a20| 74 68 61 74 20 48 61 6c | 6c 65 79 27 73 2c 0d 0a |that Hal|ley's,..|
|00003a30| 77 68 69 63 68 20 68 61 | 73 20 61 20 72 65 6c 61 |which ha|s a rela|
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|00003a50| 69 6f 64 2c 20 77 69 6c | 6c 20 70 72 6f 62 61 62 |iod, wil|l probab|
|00003a60| 6c 79 20 6c 61 73 74 20 | 61 6e 6f 74 68 65 72 0d |ly last |another.|
|00003a70| 0a 32 32 35 2c 30 30 30 | 20 79 65 61 72 73 2c 20 |.225,000| years, |
|00003a80| 61 20 6d 65 72 65 20 77 | 69 6e 6b 20 6f 66 20 61 |a mere w|ink of a|
|00003a90| 73 74 72 6f 6e 6f 6d 69 | 63 61 6c 20 74 69 6d 65 |stronomi|cal time|
|00003aa0| 2e 0d 0a 0d 0a 53 63 69 | 65 6e 74 69 73 74 73 20 |.....Sci|entists |
|00003ab0| 6c 6f 6e 67 20 61 67 6f | 20 72 65 63 6f 67 6e 69 |long ago| recogni|
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|00003ad0| 6f 6d 65 74 20 68 61 73 | 20 6e 6f 74 20 6f 6e 65 |omet has| not one|
|00003ae0| 20 62 75 74 0d 0a 74 77 | 6f 20 74 61 69 6c 73 2c | but..tw|o tails,|
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|00003b20| 6c 69 6f 6e 73 0d 0a 6f | 66 20 6d 69 6c 65 73 20 |lions..o|f miles |
|00003b30| 62 79 20 74 68 65 20 74 | 69 6d 65 20 74 68 65 20 |by the t|ime the |
|00003b40| 63 6f 6d 65 74 20 68 61 | 73 20 6d 6f 76 65 64 20 |comet ha|s moved |
|00003b50| 63 6c 6f 73 65 20 74 6f | 20 74 68 65 20 73 75 6e |close to| the sun|
|00003b60| 2e 20 54 68 65 79 0d 0a | 6e 6f 77 20 6b 6e 6f 77 |. They..|now know|
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|00003c00| 66 20 73 6f 6c 61 72 20 | 72 61 64 69 61 74 69 6f |f solar |radiatio|
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|00003c30| 74 61 69 6c 20 70 72 6f | 64 75 63 65 73 20 74 68 |tail pro|duces th|
|00003c40| 65 20 66 69 65 72 79 20 | 65 66 66 65 63 74 2e 20 |e fiery |effect. |
|00003c50| 54 68 65 20 73 65 63 6f | 6e 64 2c 20 62 6c 75 69 |The seco|nd, blui|
|00003c60| 73 68 0d 0a 61 70 70 65 | 6e 64 61 67 65 20 69 73 |sh..appe|ndage is|
|00003c70| 20 63 61 6c 6c 65 64 20 | 74 68 65 20 70 6c 61 73 | called |the plas|
|00003c80| 6d 61 20 6f 72 20 69 6f | 6e 20 74 61 69 6c 2e 20 |ma or io|n tail. |
|00003c90| 49 74 20 69 73 20 66 6f | 72 6d 65 64 20 77 68 65 |It is fo|rmed whe|
|00003ca0| 6e 0d 0a 67 61 73 65 73 | 20 66 72 6f 6d 20 74 68 |n..gases| from th|
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|00003d00| 61 72 20 77 69 6e 64 2c | 20 77 68 69 63 68 20 69 |ar wind,| which i|
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|00003d20| 65 61 6d 0d 0a 6f 66 20 | 63 68 61 72 67 65 64 20 |eam..of |charged |
|00003d30| 70 61 72 74 69 63 6c 65 | 73 20 74 68 61 74 20 65 |particle|s that e|
|00003d40| 6d 61 6e 61 74 65 20 66 | 72 6f 6d 20 74 68 65 20 |manate f|rom the |
|00003d50| 73 75 6e 20 61 6e 64 20 | 63 61 72 72 79 20 69 74 |sun and |carry it|
|00003d60| 73 0d 0a 6d 61 67 6e 65 | 74 69 63 20 66 69 65 6c |s..magne|tic fiel|
|00003d70| 64 2e 20 57 68 69 6c 65 | 20 74 68 65 20 70 6c 61 |d. While| the pla|
|00003d80| 73 6d 61 20 74 61 69 6c | 20 64 6f 65 73 20 6e 6f |sma tail| does no|
|00003d90| 74 20 72 65 66 6c 65 63 | 74 0d 0a 73 75 6e 6c 69 |t reflec|t..sunli|
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|00003db0| 6c 65 20 62 65 63 61 75 | 73 65 20 6f 66 20 74 68 |le becau|se of th|
|00003dc0| 65 20 6c 69 67 68 74 20 | 65 6d 69 74 74 65 64 20 |e light |emitted |
|00003dd0| 62 79 20 73 6f 6d 65 20 | 6f 66 0d 0a 69 74 73 20 |by some |of..its |
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|00003e60| 27 73 20 6f 72 0d 0a 61 | 6e 79 20 6f 74 68 65 72 |'s or..a|ny other|
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|00003ee0| 0d 0a 43 65 6e 74 65 72 | 20 69 6e 20 47 72 65 65 |..Center| in Gree|
|00003ef0| 6e 62 65 6c 74 2c 20 4d | 64 2e 20 22 57 65 20 64 |nbelt, M|d. "We d|
|00003f00| 6f 6e 27 74 20 65 76 65 | 6e 20 6b 6e 6f 77 20 77 |on't eve|n know w|
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|00004080| 73 79 73 74 65 6d 20 69 | 73 20 6d 6f 73 74 0d 0a |system i|s most..|
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|00004170| 20 72 6f 75 67 68 6c 79 | 20 68 61 6c 66 77 61 79 | roughly| halfway|
|00004180| 20 62 65 74 77 65 65 6e | 20 4e 65 70 74 75 6e 65 | between| Neptune|
|00004190| 27 73 0d 0a 61 6e 64 20 | 50 6c 75 74 6f 27 73 20 |'s..and |Pluto's |
|000041a0| 6f 72 62 69 74 61 6c 20 | 70 61 74 68 73 2c 20 74 |orbital |paths, t|
|000041b0| 6f 20 77 69 74 68 69 6e | 20 36 30 20 6d 69 6c 6c |o within| 60 mill|
|000041c0| 69 6f 6e 20 6d 69 6c 65 | 73 20 6f 66 20 74 68 65 |ion mile|s of the|
|000041d0| 0d 0a 73 6f 6c 61 72 20 | 73 75 72 66 61 63 65 2e |..solar |surface.|
|000041e0| 20 53 75 73 61 6e 20 57 | 79 63 6b 6f 66 66 27 73 | Susan W|yckoff's|
|000041f0| 20 68 75 73 62 61 6e 64 | 2c 20 41 72 69 7a 6f 6e | husband|, Arizon|
|00004200| 61 20 53 74 61 74 65 27 | 73 20 50 65 74 65 72 0d |a State'|s Peter.|
|00004210| 0a 57 65 68 69 6e 67 65 | 72 2c 20 61 20 71 75 61 |.Wehinge|r, a qua|
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|00004290| 65 20 73 63 68 65 6d 65 | 20 74 6f 20 6d 6f 75 6e |e scheme| to moun|
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|000042b0| 69 74 68 20 48 61 6c 6c | 65 79 27 73 20 66 69 72 |ith Hall|ey's fir|
|000042c0| 73 74 20 63 61 6d 65 20 | 75 70 20 69 6e 0d 0a 74 |st came |up in..t|
|000042d0| 68 65 20 6d 69 64 2d 27 | 37 30 73 2c 20 77 68 65 |he mid-'|70s, whe|
|000042e0| 6e 20 4e 41 53 41 20 61 | 6e 64 20 45 53 41 20 62 |n NASA a|nd ESA b|
|000042f0| 65 67 61 6e 20 64 69 73 | 63 75 73 73 69 6e 67 20 |egan dis|cussing |
|00004300| 61 0d 0a 64 6f 75 62 6c | 65 2d 62 61 72 72 65 6c |a..doubl|e-barrel|
|00004310| 65 64 20 6d 69 73 73 69 | 6f 6e 20 74 68 61 74 20 |ed missi|on that |
|00004320| 77 6f 75 6c 64 20 69 6e | 76 6f 6c 76 65 20 65 6e |would in|volve en|
|00004330| 63 6f 75 6e 74 65 72 73 | 20 77 69 74 68 20 74 77 |counters| with tw|
|00004340| 6f 0d 0a 63 6f 6d 65 74 | 73 2c 20 69 6e 63 6c 75 |o..comet|s, inclu|
|00004350| 64 69 6e 67 20 48 61 6c | 6c 65 79 27 73 2e 20 49 |ding Hal|ley's. I|
|00004360| 6e 20 4a 61 6e 75 61 72 | 79 20 31 39 38 30 2c 20 |n Januar|y 1980, |
|00004370| 68 6f 77 65 76 65 72 2c | 20 74 68 65 20 55 2e 53 |however,| the U.S|
|00004380| 2e 0d 0a 64 72 6f 70 70 | 65 64 20 6f 75 74 20 6f |...dropp|ed out o|
|00004390| 66 20 74 68 65 20 70 72 | 6f 6a 65 63 74 2c 20 6c |f the pr|oject, l|
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|000043b0| 68 65 20 62 69 6c 6c 69 | 6f 6e 2d 64 6f 6c 6c 61 |he billi|on-dolla|
|000043c0| 72 0d 0a 70 72 69 63 65 | 20 74 61 67 20 77 61 73 |r..price| tag was|
|000043d0| 20 6a 75 73 74 20 74 6f | 6f 20 68 69 67 68 2e 20 | just to|o high. |
|000043e0| 41 6d 65 72 69 63 61 6e | 20 73 63 69 65 6e 74 69 |American| scienti|
|000043f0| 73 74 73 20 77 65 72 65 | 20 6f 75 74 72 61 67 65 |sts were| outrage|
|00004400| 64 2c 0d 0a 61 6e 64 20 | 74 68 65 20 45 75 72 6f |d,..and |the Euro|
|00004410| 70 65 61 6e 73 20 77 65 | 72 65 20 64 69 73 6d 61 |peans we|re disma|
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|00004430| 45 75 72 6f 70 65 61 6e | 20 73 70 61 63 65 0d 0a |European| space..|
|00004440| 6f 66 66 69 63 69 61 6c | 73 20 77 68 6f 20 73 75 |official|s who su|
|00004450| 70 70 6f 72 74 65 64 20 | 74 68 65 20 48 61 6c 6c |pported |the Hall|
|00004460| 65 79 27 73 20 65 6e 63 | 6f 75 6e 74 65 72 20 68 |ey's enc|ounter h|
|00004470| 61 64 20 77 6f 72 6b 65 | 64 20 68 61 72 64 0d 0a |ad worke|d hard..|
|00004480| 74 6f 20 73 77 61 79 20 | 74 68 6f 73 65 20 77 68 |to sway |those wh|
|00004490| 6f 20 77 6f 75 6c 64 20 | 68 61 76 65 20 70 72 65 |o would |have pre|
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|000044b0| 45 53 41 20 66 75 6e 64 | 73 20 6f 6e 20 61 0d 0a |ESA fund|s on a..|
|000044c0| 6c 75 6e 61 72 20 6c 61 | 6e 64 69 6e 67 2e 20 22 |lunar la|nding. "|
|000044d0| 57 65 27 64 20 66 69 6e | 61 6c 6c 79 20 63 6f 6e |We'd fin|ally con|
|000044e0| 76 69 6e 63 65 64 20 65 | 76 65 72 79 6f 6e 65 20 |vinced e|veryone |
|000044f0| 74 6f 20 64 6f 20 74 68 | 65 20 63 6f 6d 65 74 0d |to do th|e comet.|
|00004500| 0a 6d 69 73 73 69 6f 6e | 2c 22 20 73 61 79 73 20 |.mission|," says |
|00004510| 52 6f 67 65 72 20 42 6f | 6e 6e 65 74 2c 20 6e 6f |Roger Bo|nnet, no|
|00004520| 77 20 64 69 72 65 63 74 | 6f 72 20 6f 66 20 45 53 |w direct|or of ES|
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|000054a0| 27 73 0d 0a 70 61 74 68 | 20 77 69 6c 6c 20 62 65 |'s..path| will be|
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|000061a0| 20 62 79 20 74 68 65 20 | 65 78 68 61 75 73 74 20 | by the |exhaust |
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