Dark Energy UPSC NOTE


  • The basic truth about space that Albert Einstein taught us is that it is not a state of ‘nothingness’. Instead, it is a bendable, stretchable medium that we occupy, much like water is for fish. 

  • Each form of energy tells the universe how to expand in its own way

  • This is much like how you can inflate a balloon with air, water or sand, and in each case it will have a characteristic look and feel.

  • Since dark energy dominates the energy budget of the universe, it also dictates the rate at which space expands. 

  • We can reverse-engineer this fact to estimate how much dark energy is present in any volume

of space, by considering the size and age of the universe

  • Add too much positive energy and the cosmos would expand too fast.

  • Galaxies would fly away from us faster than light, so that only the regions of the universe nearest to us will be visible. 

  • Effectively, this “observable universe” would appear to shrink

  • Add too much negative energy and the universe would actually shrink to a tiny point

  • The greater this negative energy, the sooner this event.

  • Everyone can agree that the universe is larger than India and older than the Indus Valley Civilisation. 

  • These facts alone restrict the density of dark energy to the caloric content of a pinch of sugar in a cubic metre. 

  • In reality, the universe is wider than billions of lightyears and older than 10 billion years, so the dark energy is actually as dilute as one sugar crystal in a cubic kilometre.



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Learnerz IAS | Concept oriented UPSC Classes in Malayalam: Dark Energy UPSC NOTE
Dark Energy UPSC NOTE
Learnerz IAS | Concept oriented UPSC Classes in Malayalam
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