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EFL B1 Upper D31

  •  English    10     Public
    Q&A
  •   Study   Slideshow
  • When do you use a satellite in daily life?
    watch TV, make long- distance phone calls
  •  15
  • Who realized the probability of a collision between two or more orbit?
    former NASA scientist Donald Kessler in the 1970s
  •  10
  • What would happen after a collision?
    hundreds of small pieces of metal would be in the orbit instead of 2 large satellites
  •  20
  • What could shattered pieces of metal from a collision cause next?
    more collisions until the space around the earth was full of pieces of metal
  •  20
  • What happened on Feb 10th, 2009?
    a large communications satellite collided with another one, adding 200 pieces of space garbage.....
  •  25
  • What did people do after the collision in Feb, 2009?
    An international conference about how to reduce objects in orbit took place
  •  20
  • How did UN support the world's space agencies? What was it about?
    gave some sensible advice about collision prevention
  •  15
  • How to prevent collisions according to UN?
    countries shouldn't use old satellite for missile target practice
  •  25
  • What did scientists discuss at the conference?
    how to get rid of old satellites and metal pieces
  •  10
  • What will happen to space garbage until a garbage collector satellite is launched?
    remain a danger to travel in space
  •  10