From various decades this question has been bugging the astronomers that how quickly our universe has been expanding. A large section of scientists along with astronomers has led studies regarding this which has produced varied results. This has led these curious minds to wonder if they have failed to identify the critical mechanism that successfully drives our cosmos.
To identify how quickly our universe is expanding, a bunch of UCLA astronomers has come forward to resolve it. They recently published their studies in the magazine called ‘Monthly Notices of the Royal Astronomical Society.’
Between all these disputes lies the iconic Hubble constant. It happens to be a number that identifies distance with the galaxy redshift process. The latter is the amount in which the light is stretched when it travels towards our planet through the universe which is in its expansion process.
Scientists explain that Hubble Constant estimates lies from 67 to 73 km per sec per megaparsec. This means that suppose there are two points in space which are one megaparsec apart from each other, they are racing away from one another with a speed of 67 to 73 km in one second. One megaparsec is almost equal to 3.26 million light-years.
Simon Birrer who led this study has stated that our universe’s physical scale is anchored by Hubble constant. Without its precise value, astronomers find it difficult to calculate our universe’s age, its expansion rate or the dimensions of several remote galaxies.
To derive Hubble constant, there lies two ingredients – the redshift of a light source and distance of specific causes of light. The team took the help of quasar for their research. Due to an intervening galaxy, the light gets bent and produces two side by side images of the quasar that appears in the sky.
To reach the earth, this light source takes two different routes, and quasar’s brightness starts fluctuating due to which the images flicker after one another.