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• Ball Lightning & Tesla's Electric Fireballs
  | name = Ball Lightning & Tesla\'s Electric Fireballs | image = Ball Lightning Teslas Electric Fireballs 838.jpg
  2 KB (366 words) - 13:33, 9 May 2018
• Hubble Deep Field
  ...lionth of the whole sky, which is equivalent in angular size to a [[tennis ball]] at a distance of 100&nbsp;metres.<ref>{{cite book |title=The Big Question
  33 KB (4,612 words) - 12:32, 5 February 2018