[ad_1]
Physicist The new "Hubble constant" indicates that the universe is still expanding – BBC Thailand
Astrophysicists can measure the growth rate of the universe. Or called "The Hubble Constant", the latest in this year discovering that our universe has developed at a higher acceleration than ever before bringing experts to revisit the current physics principles because it does not could not explain the phenomenon
The latest Hubble constant measurement results have been reported in The Astrophysical Journal by a team of researchers led by Professor Adam Rees of Johns Hopkins University in the United States. Used the Hubble Space Telescope to measure these values with new techniques more accurate than before. In this way, there are only a hundred thousand errors.
Professor Rees' team used the Cepheid variable in the star group of the large Magellanic cloud. Is the principle to measure the distance and calculate the rate of growth of the universe this time By the stars that transform the light that is brighter than the sun only hundreds of thousands As a standard candle or the lighthouse of the Universe Encourage astronomers to use light and flashing light at their exact frequencies as the main measure Accurately calculate the distance in space
The results showed that the universe is expanding with the latest rate of acceleration of 74.03 kilometers per second by MegaParsec. Which means that the universe is growing at a rate of 74.03 kilometers per second on every distance of 3.26 million light years we are looking at the world.
This number increases compared to the one used by the research team that measured and calculated last year, 73.5 km per second by MegaParsec. This is also a figure of up to 9% over the original Hubble constant calculated using cosmic microwave background (CMB) data, which scientists consider to be such condition. From the universe emerging, about 380,000 years after the Big Bang incident
Professor Rees, Nobel Prize in Physics in 2011, said: "The Hubble constant, calculated at the beginning of the universe With the latest Hubble constant, which has a conflict Point out new problems in the cosmology the The difference between these two figures will likely increase each time until it reaches the point that it was not caused by an accident or an accident. measurement error
Professor Rees pointed out that this phenomenon could be the result of dark energy, which accounts for 70% of all matter and energy in the universe. This dark energy can behave differently from what we used to understand. For example, it may be denser or dark matter may interact with normal matter more seriously than before. Which all affect the growth rate of the universe significantly
"The cosmological models that we still can not explain We may have to find new approaches to physics that can connect two different data at two different times together," said Professor Reese.
[ad_2]
Source link
