Page 54 - 東華三院辛亥年總理中學(40周年校慶特刊)
P. 54

th th
                                    to 40
          From 35
          From 35  to 40                          th th


          Physics  Mr. Kwok Chun Yeung




              In 2019, the first ever real black hole image was
          published.

              A black hole is a celestial object so massive that
          even light could not escape. Once any objects fall into
          a black hole, they can never escape from it. No lights,
          no other signals come from a black hole. Detecting a       In 2019, the first ever real black hole image was
          black hole was a “mission impossible” to scientists for   published.
          hundreds of years.
                                                                  The scheme called Event Horizon Telescope (EHT)
              The idea of black holes was first proposed by an   made use of an array of telescopes spread across the
          English astronomer John Michell in 1784, simply based   Earth. Collecting data from different telescopes, analyzing
          on the fact of gravitational pull. That was a preliminary   data, simulating with computer, a black hole image was
          hypothesis. The model of a black hole is still far from   produced after hundreds of years of efforts of scientists
          our current understanding. In 1915, Albert Einstein   around the world.
          developed the theory of general relativity. It gave the
          world a new interpretation to gravity. As a consequence,       When challenges arise, the solution is out there for
          the physics of black holes was formulated by scientists in   people with determination.
                                              th
                    th
          the early 20  century. Throughout the 20  century, more
                                                                                th
                                                                         th
          predictions and analysis had been made about black      From 35  to 40 , Sun Hoi had encountered various
          holes. However, neither visiting nor directly observing a   changes and challenges. The solution is out there. The
          black hole was feasible to most scientists.         future is in our hands. Anniversary cheers!















                                                               Black hole image (the center of galaxy M87)
                                                               Black hole image (the center of galaxy M87)





















           The image of the moon captured in astronomy camp.   Astronomy camp (Februar y 2019)
           The image of the moon captured in astronomy camp.
                                                               Astronomy camp (February 2019)
    52
   49   50   51   52   53   54   55   56   57   58   59