<P>"상대속도"는 "속도합성"과는 다른 개념입니다.</P> <P>그런데 대부분의 과학서적에서는 이 둘을 같은 공식으로 나타내고 있죠.</P> <P> </P> <P>예를 들어서 </P> <P>고전역학에서는 V=v1±v2,</P> <P>상대론에서는 V=(v1±v2)/(1+v1v2/c^2) 입니다.</P> <P> </P> <P><SPAN style="COLOR: #ff0000"><STRONG>그러나 상대속도는 이 공식으로 구하는게 아닙니다.</STRONG></SPAN></P> <P> </P> <P>이것 때문에 학계에서도 혼란스러운 사건이 있었습니다.</P> <P>대표적인 사례로 "Superluminal motion"이라는 게 있습니다.</P> <P>이건 간단하게 말하자면, <SPAN style="COLOR: #ff0000">천체 관측을 하다보면 </SPAN><SPAN style="COLOR: #ff0000">빛보다 빠른 물체의 움직임</SPAN><SPAN style="COLOR: #ff0000">을 심심치 않게 관측한다는 것.</SPAN> 입니다.</P> <P> </P> <P>몇가지 예를 보여드리면,</P> <P> </P> <P style="TEXT-ALIGN: center"><IMG style="FLOAT: none; CLEAR: none" class=txc-image src="http://thimg.todayhumor.co.kr/upfile/201211/daf29adc82be7233932777f769d49024.jpg"></P> <P style="TEXT-ALIGN: center"> <SPAN style="FONT-SIZE: 28pt"><SPAN style="FONT-FAMILY: Wingdings; COLOR: #00007d; FONT-SIZE: 12pt; mso-special-format: bullet; mso-color-index: 2">n</SPAN></SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">퀘이사 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">3C279</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">의 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">Jet</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">를 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">3</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">년 동안 관찰한 자료</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">. </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">Jet</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">의 이동속도는 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">4c(</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">광속의 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">4</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">배</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">)</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">로 측정되었다</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">.</SPAN></P> <P style="TEXT-ALIGN: center"> </P> <P style="TEXT-ALIGN: center"><IMG style="FLOAT: none; CLEAR: none" class=txc-image src="http://thimg.todayhumor.co.kr/upfile/201211/f32fbb938a91c77cb250582a7f3d2869.jpg"></P> <P style="TEXT-ALIGN: center"> <SPAN style="FONT-SIZE: 28pt"><SPAN style="FONT-FAMILY: Wingdings; COLOR: #00007d; FONT-SIZE: 12pt; mso-special-format: bullet; mso-color-index: 2">n</SPAN></SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">퀘이사 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">3C345</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">의 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">Jet</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">의 모습을 시간별로 나타낸 것이다</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">. Jet</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">의 이동속도는 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">7c(</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">광속의 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">7</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">배</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">) </SPAN></P> <P style="TEXT-ALIGN: center"> </P> <P style="TEXT-ALIGN: center"><IMG style="FLOAT: none; CLEAR: none" class=txc-image src="http://thimg.todayhumor.co.kr/upfile/201211/8bf9084120f35a6fa20cc6f54ddaa471.jpg"></P> <P style="TEXT-ALIGN: center"><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 11pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"><SPAN style="FONT-SIZE: 28pt"><SPAN style="FONT-FAMILY: Wingdings; COLOR: #00007d; FONT-SIZE: 12pt; mso-special-format: bullet; mso-color-index: 2">n</SPAN></SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">활동성 은하 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">M87</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">의 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">Jet</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">의 이동 모습이다</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">. </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">속도는 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">6c(</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">광속 </SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">6</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: ko; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">배</SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">)</SPAN></SPAN></P> <P style="TEXT-ALIGN: center"><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 11pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"></SPAN> </P> <P style="TEXT-ALIGN: left"><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 11pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"><SPAN style="FONT-SIZE: 10pt">이게 특수상대성이론에 위배되는 증거자료일까요? </SPAN></SPAN></SPAN></P> <P style="TEXT-ALIGN: left"><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 11pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"><SPAN style="FONT-SIZE: 10pt">답은 <SPAN style="COLOR: #0900ff">"아닙니다."</SPAN></SPAN></SPAN></SPAN></P> <P style="TEXT-ALIGN: left"><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 11pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"><SPAN style="FONT-SIZE: 10pt"></SPAN></SPAN></SPAN> </P> <P style="TEXT-ALIGN: left"><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 11pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 12pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"><SPAN style="FONT-SIZE: 10pt"></SPAN></SPAN></SPAN><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 11pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"><SPAN style="FONT-FAMILY: 굴림; COLOR: #000000; FONT-SIZE: 10pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">이것은 우리가 "상대속도"라는 개념에 대해서 잘못 알고 있었기 때문입니다. </SPAN></SPAN></P> <P style="TEXT-ALIGN: left"><SPAN style="FONT-FAMILY: 굴림; COLOR: black; FONT-SIZE: 11pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters"><SPAN style="FONT-FAMILY: 굴림; COLOR: #000000; FONT-SIZE: 10pt; language: en-US; mso-color-index: 1; mso-ascii-font-family: 굴림; mso-fareast-font-family: 굴림; mso-bidi-font-family: +mn-cs; text-combine: letters">그렇다면 여러분이 생각하는 올바른 <STRONG>상대속도</STRONG>는 무엇인가요?</SPAN></P></SPAN>