Hi\u00ea\u0323n nay, chu\u0301ng ta kh\u00f4ng nh\u01b0\u0303ng \u0111\u01b0\u01a1\u0323c xem ca\u0301c ch\u01b0\u01a1ng tri\u0300nh truy\u00ea\u0300n hi\u0300nh trong n\u01b0\u01a1\u0301c ma\u0300 chu\u0301ng ta co\u0300n co\u0301 th\u00ea\u0309 xem ca\u0301c ch\u01b0\u01a1ng tri\u0300nh truy\u00ea\u0300n hi\u0300nh cu\u0309a ca\u0301c \u0111a\u0300i truy\u00ea\u0300n hi\u0300nh n\u01b0\u01a1\u0301c ngoa\u0300i b\u0103\u0300ng truy\u00ea\u0300n hi\u0300nh v\u00ea\u0323 tinh.<\/p>\n\n\n\n
T\u01b0\u0300 khoa\u0309ng ca\u0301ch ha\u0300ng ch\u01b0\u0323c nghi\u0300n km so v\u01a1\u0301i m\u0103\u0323t \u0111\u00e2\u0301t, ca\u0301c v\u00ea\u0323 tinh truy\u00ea\u0300n hi\u0300nh thu va\u0300 pha\u0301t ti\u0301n hi\u00ea\u0323u nh\u01b0 th\u00ea\u0301 na\u0300o? N\u0103m 1946 ng\u01b0\u01a1\u0300i My\u0303 \u0111a\u0303 th\u01b0\u0309 nghi\u00ea\u0323m tha\u0300nh c\u00f4ng truy\u00ea\u0300n hi\u0300nh v\u00ea\u0323 tinh b\u0103\u0300ng ca\u0301ch, ho\u0323 du\u0300ng m\u00f4\u0323t ra\u0111a pha\u0301t ti\u0301n hi\u00ea\u0323u l\u00ean m\u0103\u0323t tr\u0103ng, ngay l\u00e2\u0323p t\u01b0\u0301c ho\u0323 \u0111a\u0303 thu \u0111\u01b0\u01a1\u0323c so\u0301ng pha\u0309n h\u00f4\u0300i quay tr\u01a1\u0309 la\u0323i m\u0103\u0323t \u0111\u00e2\u0301t. \u0110i\u00ea\u0300u \u0111o\u0301 cho th\u00e2\u0301y t\u01b0\u0300 m\u00f4\u0323t ha\u0300nh tinh ca\u0301ch xa Tra\u0301i \u0111\u00e2\u0301t, so\u0301ng vi ba mang ti\u0301n hi\u00ea\u0323u truy\u00ea\u0300n hi\u0300nh co\u0301 th\u00ea\u0309 xuy\u00ean qua t\u00e2\u0300ng khi\u0301 quy\u00ea\u0309n pha\u0309n h\u00f4\u0300i tr\u01a1\u0309 la\u0323i m\u0103\u0323t \u0111\u00e2\u0301t. Tr\u00ean c\u01a1 s\u01a1\u0309 \u0111o\u0301 ca\u0301c nha\u0300 khoa ho\u0323c b\u0103\u0301t \u0111\u00e2\u0300u nghi\u00ean c\u01b0\u0301u th\u00f4ng tin v\u00ea\u0323 tinh. Va\u0300o nh\u01b0\u0303ng n\u0103m 60 cu\u0309a th\u00ea\u0301 ki\u0309 XX ng\u01b0\u01a1\u0300i ta \u0111a\u0303 ch\u00ea\u0301 ta\u0323o ra v\u00ea\u0323 tinh nh\u00e2n ta\u0323o va\u0300 ho\u0323 \u0111a\u0303 pho\u0301ng tha\u0300nh c\u00f4ng l\u00ean quy\u0303 \u0111a\u0323o ca\u0301ch Tra\u0301i \u0111\u00e2\u0301t 36.000 km, v\u00ea\u0323 tinh na\u0300y quay quanh \u0111i\u0323a c\u00e2\u0300u, t\u00f4\u0301c \u0111\u00f4\u0323 quay cu\u0309a no\u0301 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u01a1\u0301i t\u00f4\u0301c \u0111\u00f4\u0323 quay cu\u0309a Tra\u0301i \u0111\u00e2\u0301t, do \u0111o\u0301 so v\u01a1\u0301i Tra\u0301i \u0111\u00e2\u0301t v\u00ea\u0323 tinh na\u0300y lu\u00f4n hoa\u0323t \u0111\u00f4\u0323ng. Vi\u0301 du\u0323, ti\u0301n hi\u00ea\u0323u \u0111\u01b0\u01a1\u0323c truy\u00ea\u0300n \u0111i t\u01b0\u0300 m\u00f4\u0323t trung t\u00e2m pha\u0301t so\u0301ng na\u0300o \u0111o\u0301 tr\u00ean Tra\u0301i \u0111\u00e2\u0301t, tr\u01b0\u01a1\u0301c h\u00ea\u0301t ti\u0301n hi\u00ea\u0323u \u0111o\u0301 \u0111\u01b0\u01a1\u0323c \u0111\u01b0a t\u01a1\u0301i c\u01b0\u0309a tra\u0323m v\u00ea\u0323 tinh m\u0103\u0323t \u0111\u00e2\u0301t b\u0103\u0300ng \u0111\u01b0\u01a1\u0300ng d\u00e2y ca\u0301p, \u01a1\u0309 \u0111o\u0301 ti\u0301n hi\u00ea\u0323u \u0111\u01b0\u01a1\u0323c x\u01b0\u0309 ly\u0301, va\u0300 \u0111\u01b0\u01a1\u0323c chuy\u00ea\u0309n pha\u0301t \u0111\u00ea\u0301n v\u00ea\u0323 tinh nh\u00e2n ta\u0323o th\u00f4ng qua \u0103ngten m\u0103\u0323t \u0111\u00e2\u0301t, v\u00ea\u0323 tinh na\u0300y co\u0301 vai tro\u0300 nh\u01b0 m\u00f4\u0323t tra\u0323m thu pha\u0301t so\u0301ng tr\u00ean kh\u00f4ng. \u0110\u00f4\u0300ng th\u01a1\u0300i v\u01a1\u0301i vi\u00ea\u0323c thu ti\u0301n hi\u00ea\u0323u, v\u00ea\u0323 tinh ma\u0303 ho\u0301a ca\u0301c ti\u0301n hi\u00ea\u0323u d\u01b0\u01a1\u0301i da\u0323ng so\u0301ng \u0111i\u00ea\u0323n t\u01b0\u0300 va\u0300 pha\u0301t quay tr\u01a1\u0309 la\u0323i m\u0103\u0323t \u0111\u00e2\u0301t, \u0103ngten pha\u0301t so\u0301ng cu\u0309a tra\u0323m thu pha\u0301t so\u0301ng tr\u00ean m\u0103\u0323t \u0111\u00e2\u0301t se\u0303 thu ti\u0301n hi\u00ea\u0323u \u0111o\u0301 va\u0300 khu\u00ea\u0301ch \u0111a\u0323i l\u00ean, sau \u0111o\u0301 chuy\u00ea\u0309n va\u0300o tivi va\u0300 \u0111\u01b0\u01a1\u0323c ta\u0301i ta\u0323o la\u0323i tha\u0300nh hi\u0300nh a\u0309nh va\u0300 \u00e2m thanh.<\/p>\n\n\n\n
N\u0103m 1956, My\u0303 l\u00e2\u0300n \u0111\u00e2\u0300u ti\u00ean pho\u0301ng tha\u0300nh c\u00f4ng “V\u00ea\u0323 tinh th\u00f4ng tin qu\u00f4\u0301c t\u00ea\u0301” va\u0300 b\u0103\u0301t \u0111\u00e2\u0300u pha\u0301t th\u01b0\u0309 nghi\u00ea\u0323m tr\u01b0\u0323c ti\u00ea\u0301p ca\u0301c ch\u01b0\u01a1ng tri\u0300nh truy\u00ea\u0300n hi\u0300nh t\u01a1\u0301i \u0103ngten cu\u0309a ca\u0301c h\u00f4\u0323 gia \u0111i\u0300nh. Ca\u0301c h\u00f4\u0323 gia \u0111i\u0300nh chi\u0309 c\u00e2\u0300n l\u0103\u0301p \u0111\u0103\u0323t m\u00f4\u0323t \u0103ngten ti\u00ea\u0301p so\u0301ng v\u00ea\u0323 tinh la\u0300 co\u0301 th\u00ea\u0309 xem \u0111\u01b0\u01a1\u0323c ca\u0301c ch\u01b0\u01a1ng tri\u0300nh cu\u0309a truy\u00ea\u0300n hi\u0300nh v\u00ea\u0323 tinh. Truy\u00ea\u0300n hi\u0300nh v\u00ea\u0323 tinh chuy\u00ea\u0309n ta\u0309i m\u00f4\u0323t l\u01b0\u01a1\u0323ng th\u00f4ng tin r\u00e2\u0301t l\u01a1\u0301n, \u0111\u00f4\u0323 nhi\u00ea\u0303u so\u0301ng kh\u00f4ng \u0111a\u0301ng k\u00ea\u0309, ch\u00e2\u0301t l\u01b0\u01a1\u0323ng \u00e2m thanh va\u0300 hi\u0300nh a\u0309nh t\u00f4\u0301t.<\/p>\n\n\n\n
Hi\u00ea\u0323n nay \u01a1\u0309 n\u01b0\u01a1\u0301c ta ch\u01b0a co\u0301 truy\u00ea\u0300n hi\u0300nh v\u00ea\u0323 tinh, s\u01a1\u0309 di\u0303 ba\u0323n co\u0301 th\u00ea\u0309 xem tr\u01b0\u0323c ti\u00ea\u0301p ca\u0301c tr\u00e2\u0323n bo\u0301ng \u0111a\u0301 th\u00ea\u0301 gi\u01a1\u0301i la\u0300 nh\u01a1\u0300 qua\u0301 tri\u0300nh chuy\u00ea\u0309n ti\u00ea\u0301p cu\u0309a \u0110a\u0300i truy\u00ea\u0300n hi\u0300nh Trung \u01b0\u01a1ng. \u0110a\u0300i truy\u00ea\u0300n hi\u0300nh Trung \u01b0\u01a1ng thu so\u0301ng t\u01b0\u0300 v\u00ea\u0323 tinh va\u0300 gia\u0309i ma\u0303 ca\u0301c ti\u0301n hi\u00ea\u0323u sau \u0111o\u0301 chuy\u00ea\u0309n pha\u0301t t\u01a1\u0301i ca\u0301c \u0111a\u0300i truy\u00ea\u0300n hi\u0300nh ca\u0301c ti\u0309nh va\u0300 chuy\u00ea\u0309n t\u01a1\u0301i \u0103ngten tivi cu\u0309a ca\u0301c h\u00f4\u0323 gia \u0111i\u0300nh.<\/p>\n","protected":false},"excerpt":{"rendered":"
Hi\u00ea\u0323n nay, chu\u0301ng ta kh\u00f4ng nh\u01b0\u0303ng \u0111\u01b0\u01a1\u0323c xem ca\u0301c ch\u01b0\u01a1ng tri\u0300nh truy\u00ea\u0300n hi\u0300nh trong n\u01b0\u01a1\u0301c ma\u0300 chu\u0301ng ta co\u0300n co\u0301 th\u00ea\u0309 xem ca\u0301c ch\u01b0\u01a1ng tri\u0300nh truy\u00ea\u0300n hi\u0300nh cu\u0309a ca\u0301c \u0111a\u0300i truy\u00ea\u0300n hi\u0300nh n\u01b0\u01a1\u0301c ngoa\u0300i b\u0103\u0300ng truy\u00ea\u0300n hi\u0300nh v\u00ea\u0323 tinh. T\u01b0\u0300 khoa\u0309ng ca\u0301ch ha\u0300ng ch\u01b0\u0323c nghi\u0300n km so v\u01a1\u0301i m\u0103\u0323t \u0111\u00e2\u0301t, ca\u0301c v\u00ea\u0323 tinh truy\u00ea\u0300n hi\u0300nh […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[1,15],"tags":[],"class_list":["post-11280","post","type-post","status-publish","format-standard","hentry","category-general","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/11280","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=11280"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/11280\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=11280"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=11280"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=11280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}