A new measurement has been set by astronomers to measure the expansion of the universe. For this they have chosen a different form of star in comparison to previous endeavors. In the past, scientists have used Hubble constant to determine the expansion of the universe. Recently, Wendy Freedman and her colleagues provided completely new measurement for modern universe’s expansion. They suggest that the universe is expanding faster than what scientists have stated earlier.
Due to higher amount of discrepancies between observations as well as predictions scientists are considering whether they should provide new model of universe to explain the shift. During one of her recent interviews, Freedman stated that Hubble constant is a cosmological parameter which provides exact age, scale and size of outer universe. She further stated that the discrepancy hasn’t eradicated. Furthermore, the new evidence suggested that jury is still considering the fact whether the present model is perfect or not.
Freedman and associates are using a Red Giant star to make a new measurement for Hubble Constant. As per the new measurement, nearby universe is expanding at a rate below 70 km/sec/Mpc. 3.26 light years are equal to 1 parsec. The earlier Hubble Constant measurement is less than 74 km/sec/Mpc, the team used Cepheid variables for this purpose, and these are the stars which provide pulse at a regular interval of time.
Back in 2001, a team was led by Freedman that used distant star so that they can make a measurement for Hubble Constant. While using the Cepheid variable as markers for distance, the team concluded that Hubble Constant’s value is around 72 km/sec/Mpc. Recently scientists undertook a totally different approach and recorded the reading for Hubble Constant to around 67.4 km/sec/Mpc.
During an interview, Freedman stated that due to the present discrepancy two questions arises one whether the cosmic model of universe in incomplete and two whether Astronomers have full acknowledgement about the star which is being measured.