Astronomers know that the Universe is expanding and it happening in an accelerated manner. The rate at which the Universe is currently expanding gets regarded as the Hubble Constant. It happens to be the subject of quite an important discrepancy. The value of Hubble Constant changes primarily based on how scientists try to measure it. The space between the stars as well as the galaxies grows. Due to this reason, scientists have gone on to devise different ways to measure the rate of expansion.
Scientists have adopted one method that calculates the expansion purely based on the farthest radiation, which the experiments can see. This is called the cosmic microwave background. Others have used up information from supernovae to get the rate calculated. Both these methods have measured the rate of expansion to be around 67.7 kilometres per second per megaparsec. Those scientists who use the Hubble Space Telescope recalculated the Hubble constant through highly accurate measurement of the distance to a satellite galaxy known as the Large Magellan Cloud. When they see farther away, the Universe seems to expand in a slower manner than when they look at the local Universe.
Constant pursuit for precision is required to determine what Hubble Constant exactly is. This will help to make a transition from the discovery of a difference to a diagnosis of their source. Scientists are already in pursuit of new avenues to measure Hubble Constant. They are making use of colliding neutron stars and the gravitational waves, which they produce in space itself. Now, calculating the distance to the collision by using gravitational waves along with the speed that the stars are receding by the use of collision’s light can help the physicists. They will have another avenue to calculate the value of the Hubble constant.