The Universe Is Expanding On An Accelerated Rate, More Than Scientists Estimated Before

Share

Astronomers have measured the expansion rate of the Universe, and it seems that it expanded at a faster rate than it was previously thought in the past. The rate is considerably quicker than it should have been if we take into accounts the conditions that were present after the Big Bang.

In the scientific community, the rate of the expansion is known as the Hubble Constant, which is based on the Hubble Law. Data received from the Planck satellite, which measured the cosmic microwave background ( the conditions that helped the formation of the early universe) was used to calculate the constant. At 380,000 years after the Big Bang, the Hubble Constant should be around 67.4 kilometers per second per megaparsec, with on uncertainty level below 1%.

The Hubble Constant can be derived by using several means. Edwin Hubble based his assumptions on the data obtained by observing the Doppler shift of retreating nebulae, or in more understandable terms the changes which occurred in wavelengths of light as the target object moved farther away.

The Universe Is Expanding On An Accelerated Rate

The advancements of science allow modern researchers to used superior methods, which can convey data with higher accuracy. In most cases, the researches will provide reliable referential tools like Cepheid variable stars, which allow them to measure distance accurately. This method offered a more significant and more consistent amount of data in comparison to Planck.

A recent calculation of the Hubble Constant which involved the use of a Cepheid variable suggests that the expansion rate of the universe reaches 73.5 kilometers per second per megaparsec. By using the Hubble Space Telescope, a team of astronomers managed to measure the absolute brightness of 70 Cepheid variables which can be found in the Large Magellanic Cloud.

The results of this survey led to a new Hubble Constant: 74.03 kilometers per second, per megaparsec. The difference is quite significant since the rate is 9% faster in comparison to previous results offered by data collected from Planck. The results of the research will be published in a scientific journal.


Share

Recommended For You

Leave a Reply

Your email address will not be published. Required fields are marked *