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Practice Reading: Fill in the Blanks (Dropdown) ID: #52184 Newton's law
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Newton's  law  of  gravity  unveiled  a    truth  about  comets:  their  orbits  can  take  any  shape,  like  elliptical  orbits,  parabolic  paths,  or  even  hyperbolic  form.  But  among  the  hundreds  of  known  comet  paths,  none  exhibit  a  clear-cut  hyperbolic  form  distinguishable  from  a  parabola  to  our  eyes.  Even  more  intriguing,  all  observed  ellipses  are  remarkably  elongated,  unlike  the  relatively  round  closed,  circular  tracks  of  planets.  This  has  led  astronomers  to  regard  the  parabola  as  the  typical  comet  orbit  and  view  deviations  from  it  as  unusual,  requiring  special  explanation.  The    of  parabolic  or  near-parabolic  orbits  explains  why  comets  are  like  temporary  guests  in  our  solar  system.  Unlike  planets  confined  to  closed,  circular  tracks,  comets  travel  on  open  curves,  like  parabolas.  Once  they  brush  past  Earth  and  the  Sun,  their  journey  continues  ever  onward,    disappearing  from  view.  Their  dramatic  transformations  during  their  brief  visibility,  with  tails  and  nuclei  forming  and  fading,  are  directly  tied  to  their  changing  distance  from  the  Sun,  reaching  peak  complexity  when  closest.  Imagine  a  comet's  path  as  a  stretched-out  slingshot,  propelling  it  towards  the  Sun  and  then  flinging  it  back  out  to  the  edges  of  our  cosmic  system.  This  explains  why  these  celestial  visitors  are  fleeting:  their  parabolic  paths  offer  just  a    glimpse  before  taking  them  on  journeys  beyond  our  visible  realm.  In  essence,  comets  are  temporary  members  of  our  solar  system,  their  grand  spectacle  a  brief    of  their  unique,  elongated  trajectories.  We  may  marvel  at  their  fleeting  beauty,  but  it  is  precisely  their  parabolic  paths  that  dictate  their  impermanence,  carrying  them  on  journeys  beyond  our  gaze.

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