♡사는 하루하루가 기적(奇跡)

♡사는 하루하루가 기적(奇跡)

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오늘은 우리가 살아가고 있는 지구라는 것 을 살펴보면서 이 속에 어떤 기적을 숨겨 두셨는지를 살펴보려 합니다.

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만약 섭씨 한 1000도가넘는 철판 위에 개미를 한 마리 올려놓는다면 어떻게 될 것 같습니까? 아마 순식간에 타죽고 말 것입니다.

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만약 그렇게 뜨거운 철판 위에서도 죽지 않고 멀쩡히 살아서 기어 다닌다면 사람들은 야, 기적이 일어났다 할 것입니다. 그런데 바로 이런 기적 속에서 우리는 매일을 살아가고 있는데 우리가 사는 지구의 모습이 그렇습니다.

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우리가 사는 지구는 지표면에서 중심까지 약 6400km 랍니다. 그 중에서 지표면 흙의 두께는 15~35km 정도, 지구 전체 깊이에서 본다면 지표면은 불판 위에 올려진 철판 두께처럼 얇습니다.

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지구 중심 내핵(內核)의 온도는 약 4500도이고, 지표면은 15도 정도입니다. 그러니까 아래에서는 4500도가 넘는 불덩이가 있고, 그 위에 아주 얇은 지표면 위에서 우리가 죽지 않고 살아가고 있는 것입니다.

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우리가 사는 땅속뿐만 아니라 땅 위의 상황도 마찬가지입니다. 사람이 숨을 쉴 수 있는 공기층, 그러니까 사람이 숨을 쉬며 살아가고 날씨 변화가 일어나는 대기권은 지상에서 대략 10km 정도라고 합니다. 그런데 10km라고는 해도 실제로 2000m 정도의 높은 산에만 올라가도 호흡이 곤란한 것을 생각하면 실제로 인간이 자유롭게 숨을 쉬며 생활 할 수 있는 공기 두께는 지구 전체 크기나 우주에서 본다면, 마치 아주 얇은 비닐 막 정도에 불과합니다.

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밑은 수 천도의 뜨거운 불덩이, 위는 아주 얇은 공기층, 바로 그사이 좁은 공간에서 80억의 인구가 모여 사는 것입니다.

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그러니 지금 우리가 살아 움직이고 있는 이 자체가 기적인 것입니다.

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코를 꼭 잡고 입을 열지 않은 채 얼마쯤 숨을 쉬지 않을 수 있는지 참아보십시오. 30초를 넘기기가 쉽지 않습니다.

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숨을 쉬지 않고 참아보면그제야 비로소 내가 숨 쉬고 있다는 걸 알게 됩니다. 그런데 여러분은 숨을 쉬려고 노력했습니까?

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훗날 병원에 입원해서 산소호흡기를 끼고 숨을 쉴 때야 비로소 숨 쉬는게 참으로 행복했다는 걸 알게 된다면 이미 행복을 놓친 것입니다.

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뛰는 맥박을 손가락 끝으로 느껴보십시오 심장의 박동으로 온몸 구석구석 실핏줄 끝까지 피가 돌고 있다는 증거입니다.

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그런데도 우리는 날마다무수히 신비롭게 박동하고 있는 심장을 고마워했습니까?

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우리는 날마다 기적을 일구고 있습니다. 심장이 멈추지 않고 숨이 끊기지 않는 기적을 매일매일 일으키고 있는 것입니다.

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이제부터는 아침에 눈을 뜨면 벌떡 일어나지 말고 20초 정도만 자신의 가슴에 손을 얹고 읊조리듯 말하십시오.

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첫째, 오늘도 살아있게 해주어 고맙습니다.

둘째, 오늘 하루도 즐겁게 웃으며 건강하게 살겠습니다.

셋째, 오늘 하루 남을 기쁘게 하고 세상에 조금이라도 보탬이 되겠습니다.

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그렇게 서너 달만 해보면자신이 놀랍도록 긍정적으로 변했음을 발견할 것입니다. 물론 말로만 하면 자신에게 거짓말한 것과다르지 않습니다. 가능하면 말한대로 실행하십시오.

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그러면 잔병치레도 하지 않게 됩니다. 아픈 곳에 손을 대고 읊조리면 쉽게 낫거나 통증이 약해지기도 합니다.

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당신은 1년 후에 살아있을 수 있습니까? 1년 후에 우리 모두 살아있다면 그것이 바로 기적입니다. 그러나 반드시 살아있어야 합니다.

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살던 대로 대충, 그냥 그렇게 사는 것이 아니라 잘 웃고, 재미있게, 건강하게, 행복하게, 신나게 세상에 보탬이 되는 사람으로 살아있어야 합니다.

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지금의 자신을 면밀히 살펴보십시오. 내 육신을 학대하지는 않았는가, 마음을 들쑤시지는 않았는가 돌아보아야 합니다.

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몸이 원하는 것 이상의 음식을 먹는 것도 학대이며, 몸이 요구하는 편안함을 거부하는 것도 학대이며, 몸을 부지런히 움직이지 않는 것도 학대입니다.

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ㅡ김홍신 < 인생사용 설명서 > 중에서

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추가정보 : 창백한 푸른점(Pale Blue Dot)

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But at farther distances, continents and oceans blur together, and all that is left is

a pale blue dot.

그러나 먼 거리에서 보면, 대륙과 바다들이 흐릿하게 하나로 보여서, 창백한 푸른 점으로 보인다.

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From Wikipedia, the free encyclopedia

This article is about the photograph. For other uses, see Pale Blue Dot (disambiguation).

Seen from about 6 billion kilometers (3.7 billion miles), Earth appears as a tiny dot within deep space: the blueish-white speck almost halfway up the rightmost band of light.

Pale Blue Dot is a photograph of planet Earth taken on February 14, 1990, by the Voyager 1 space probe from a record distance of about 6 billion kilometers (3.7 billion miles, 40.5 AU), as part of that day's Family Portrait series of images of the Solar System.

In the photograph, Earth's apparent size is less than a pixel; the planet appears as a tiny dot against the vastness of space, among bands of sunlight reflected by the camera.[1]

Voyager 1, which had completed its primary mission and was leaving the Solar System, was commanded by NASA to turn its camera around and take one last photograph of Earth across a great expanse of space, at the request of astronomer and author Carl Sagan.[2] The phrase "Pale Blue Dot" was coined by Sagan in his reflections on the photograph's significance, documented in his 1994 book of the same name.[1]

Background[edit]

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In September 1977, NASA launched Voyager 1, a 722-kilogram (1,592 lb) robotic spacecraft on a mission to study the outer Solar System and eventually interstellar space.[3][4] After the encounter with the Jovian system in 1979 and the Saturnian system in 1980, the primary mission was declared complete in November of the same year. Voyager 1 was the first space probe to provide detailed images of the two largest planets and their major moons.

The Voyager 1 spacecraft

The spacecraft, still travelling at 64,000 km/h (40,000 mph), is the most distant human-made object from Earth and the first one to leave the Solar System.[5] Its mission has been extended and continues to this day, with the aim of investigating the boundaries of the Solar System, including the Kuiper belt, the heliosphere and interstellar space. Operating for 45 years, 10 months and 21 days as of 26 July 2023, it receives routine commands and transmits data back to the Deep Space Network.[3][6][7]

Voyager 1 was expected to work only through the Saturn encounter. When the spacecraft passed the planet in 1980, Sagan proposed the idea of the space probe taking one last picture of Earth.[8] He acknowledged that such a picture would not have had much scientific value, as the Earth would appear too small for Voyager's cameras to make out any detail, but it would be meaningful as a perspective on humanity's place in the universe.[8]

Although many in NASA's Voyager program were supportive of the idea, there were concerns that taking a picture of Earth so close to the Sun risked damaging the spacecraft's imaging system irreparably. It was not until 1989 that Sagan's idea was put in motion, but then instrument calibrations delayed the operation further, and the personnel who devised and transmitted the radio commands to Voyager 1 were also being laid off or transferred to other projects. Finally, NASA Administrator Richard Truly interceded to ensure that the photograph was taken.[5][9][10] A proposal to continue to photograph Earth as it orbited the Sun was rejected.[11]

Camera[edit]

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Voyager 1's Imaging Science Subsystem (ISS) consists of two cameras: a 200 mm focal length, low-resolution wide-angle camera (WA), used for spatially extended imaging, and a 1500 mm high-resolution narrow-angle camera (NA) – the one that took Pale Blue Dot – intended for detailed imaging of specific targets. Both cameras are of the slow-scan vidicon tube type and were fitted with eight colored filters, mounted on a filter wheel placed in front of the tube.[12][13]

The challenge was that, as the mission progressed, the objects to be photographed would increasingly be farther away and would appear fainter, requiring longer exposures and slewing (panning) of the cameras to achieve acceptable quality. The telecommunication capability also diminished with distance, limiting the number of data modes that could be used by the imaging system.[14]

After taking the Family Portrait series of images, which included Pale Blue Dot, NASA mission managers commanded Voyager 1 to power its cameras down, as the spacecraft was not going to fly near anything else of significance for the rest of its mission, while other instruments that were still collecting data needed power for the long journey to interstellar space.[15]

Photograph[edit]

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Position of Voyager 1 on February 14, 1990. The vertical bars are spaced one year apart and indicate the probe's distance above the ecliptic.

The design of the command sequence to be relayed to the spacecraft and the calculations for each photograph's exposure time were developed by space scientists Candy Hansen of NASA's Jet Propulsion Laboratory and Carolyn Porco of the University of Arizona.[9] The command sequence was then compiled and sent to Voyager 1, with the images taken at 04:48 GMT on February 14, 1990.[16] At that time, the distance between the spacecraft and Earth was 40.47 astronomical units (6,055 million kilometers, 3,762 million miles).[17]

The data from the camera was stored initially in an on-board tape recorder. Transmission to Earth was also delayed by the Magellan and Galileo missions being given priority use of the Deep Space Network. Then, between March and May 1990, Voyager 1 returned 60 frames back to Earth, with the radio signal travelling at the speed of light for nearly five and a half hours to cover the distance.[5]

Three of the frames received showed the Earth as a tiny point of light in empty space. Each frame had been taken using a different color filter: blue, green and violet, with exposure times of 0.72, 0.48 and 0.72 seconds respectively. The three frames were then recombined to produce the image that became Pale Blue Dot.[18][19]

The wide-angle photograph of the Sun and inner planets (not visible), with Pale Blue Dot superimposed on the left, Venus to its right

Of the 640,000 individual pixels that compose each frame, Earth takes up less than one (0.12 of a pixel, according to NASA). The light bands across the photograph are an artifact, the result of sunlight reflecting off parts of the camera and its sunshade, due to the relative proximity between the Sun and the Earth.[5][20] Voyager's point of view was approximately 32° above the ecliptic. Detailed analysis suggested that the camera also detected the Moon, although it is too faint to be visible without special processing.[19]

Pale Blue Dot, which was taken with the narrow-angle camera, was also published as part of a composite picture created from a wide-angle camera photograph showing the Sun and the region of space containing the Earth and Venus. The wide-angle image was inset with two narrow-angle pictures: Pale Blue Dot and a similar photograph of Venus. The wide-angle photograph was taken with the darkest filter (a methane absorption band) and the shortest possible exposure (5 milliseconds), to avoid saturating the camera's vidicon tube with scattered sunlight. Even so, the result was a bright burned-out image with multiple reflections from the optics in the camera and the Sun that appears far larger than the actual dimension of the solar disk. The rays around the Sun are a diffraction pattern of the calibration lamp which is mounted in front of the wide-angle lens.[19]

Pale blue color[edit]

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Earth appears as a blue dot in the photograph primarily because of Rayleigh scattering of sunlight in its atmosphere. In Earth's air, short-wavelength visible light such as blue light is scattered to a greater extent than longer wavelength light such as red light, which is the reason why the sky appears blue from Earth.[21][22] (The ocean also contributes to Earth's blueness, but to a lesser degree than scattering.[21]) Earth is a pale blue dot, rather than dark blue, because white light reflected by clouds combines with the scattered blue light.[22]

Earth's reflectance spectrum from the far-ultraviolet to the near-infrared is unlike that of any other observed planet and is partially due to the presence of life on Earth.[22] Rayleigh scattering, which causes Earth's blueness, is enhanced in an atmosphere that does not substantially absorb visible light, unlike, for example, the orange-brown color of Titan, where organic haze particles absorb strongly at blue visible wavelengths.[23] Earth's plentiful atmospheric oxygen, which is produced by photosynthetic life forms, causes the atmosphere to be transparent to visible light, which allows for substantial Rayleigh scattering and hence stronger reflectance of blue light.

Reflections[edit]

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In his 1994 book, Pale Blue Dot, Carl Sagan comments on what he sees as the greater significance of the photograph, writing:

From this distant vantage point, the Earth might not seem of any particular interest. But for us, it's different. Consider again that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there – on a mote of dust suspended in a sunbeam.

— Carl Sagan[24][25]​

Anniversaries[edit]

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Pale Blue Dot Revisited, 2020

In 2015, NASA acknowledged the 25th anniversary of the photograph. Ed Stone, Voyager project scientist, commented: "Twenty-five years ago, Voyager 1 looked back toward Earth and saw a "pale blue dot", an image that continues to inspire wonderment about the spot we call home."[26]

In 2020, for the image's 30th anniversary, NASA published a new version of the original Voyager photo: Pale Blue Dot Revisited, obtained using modern image processing techniques "while attempting to respect the original data and intent of those who planned the images." Brightness levels and colors were rebalanced to enhance the area containing the Earth, and the image was enlarged, appearing brighter and less grainy than the original. The direction of the Sun is toward the bottom, where the image is brightest.[16][27]

To celebrate the same occasion, the Carl Sagan Institute released a video with several noted astronomers reciting Sagan's "Pale Blue Dot" speech.[28]