We are 
From 0°C to infinity, heat is the source of all movement. From the Sun’s core to the bowels of the Earth, as well as in the blazing hearts of our engines, it infuses its energy, allowing us to exceed our limitations and to explore the Universe. #ArianeGrouppic.twitter.com/rnrl8mLE43
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And the maximum isn't infinity, there is theories, like Plank temperature or Hagedorn temperature but not infinity.
