Science & Tech

To resolve the Universe Expansion Debate: Hubble Constant

  • A novel approach to addressing a significant cosmological topic has been developed by researchers from India and the US.
  • How quickly is the universe expanding? is the question.

The Universe’s History

  • The Big Bang, a tremendous explosion that created the universe, occurred roughly 13.8 billion years ago.
  • The universe expanded over time, occasionally speeding up and occasionally slowing down.
  • In order to grasp what is happening in the cosmos, scientists strive to comprehend this expansion.

The Hubble Constant: A Serious Issue

  • The Hubble constant is a unique quantity that indicates the rate of expansion of the cosmos.
  • Scientist Edwin Hubble made the first mention of this number in 1929.
  • However, scientists today are still unsure of its worth.

Important Parameters to Measure

  • We must carefully measure two things in order to determine the Hubble constant.
  • how far away objects are from us in space.
  • How quickly the universe is expanding, making these things move farther and farther away from us.

Invention vs. Tradition

  • The Hubble constant has so far been measured by a few different techniques by scientists:
  • Observing the supernovae, or bright explosions in space.
  • Utilising unique illumination from the early universe.
  • Examining the waves left behind by large space collisions.
  • But now, researchers from India have proposed a novel approach: measuring with a technique known as “gravitational lensing.”

Using gravitational lensing: a novel method

  • Similar to utilising gravity to bend light, gravitational lensing. Think of it as a magnifying glass in outer space.
  • This notion dates back a long time, but it has lately improved.
  • The Hubble constant may be measured using this lensing technique, according to scientists.
  • They are interested in studying how gravity bends the waves produced by space encounters.
  • The speed at which the cosmos is expanding may be revealed by these bent waves.
  • The Key Concept: A Time-Space Bridge
  • This novel concept is intriguing since it links several eras in the evolution of the universe.
  • It might provide a solid response about the Hubble constant.


  • While this concept is interesting, there are significant problems to be resolved:
  • Ensuring that the signals are sufficiently distinct to measure.
  • Using the new approach to address additional queries.
  • If this new approach is successful, it might aid in our understanding of dark matter and other facets of the cosmos.
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