Since the discovery of the expansion of the Universe, or almost, the question has plagued astrophysicists. How fast is this expansion going on today? Because observations and theory do not give the same answer. Now, the Hubble Space Telescope provides more accuracy.
Amuaexpands. no doubt. What the debate is which continues today . The current rate of expansion – translated by that the baptized it, Hubble consistently. This is in honor of the American who discovered the phenomenon of the expansion of the universe and made its first measurements in 1920. And the tribute is further strengthened now as researchers reveal new more accurate than ever. Derived from data collected over 30 years of .
It should be remembered that measurement is really one of the main reasons for the existence of this instrument. Efforts made in the early 1970s were aimed at developing a tool capable of resolving Cepheids. Because the Cepheids,has long served as a cosmic marker, a kind of standard meter for . Since 1912, exactly. They can be found in our Milky Way and inside away, thanks to the Hubble Space Telescope, up to about 80 million .
When Hubble was launched in the 1990s the first series of Cepheid observations were made. With the primary purpose of refinement measuring the distances of galaxies close to us. In the early 2000s, the efforts ofreciprocated. They are thus able to deduce a value from with an accuracy of 10%. The value is 72 plus or minus 8 kilometers per second per megaparsec (km/s/MPc).
What value is correct?
To refine this value, the researchers added new cameras to the space telescope. With the idea of achieving an accuracy of 1%. An idea led specifically for collaboration Supernova, H0, for the Equation of State of Dark Energy (SH0ES).
The new results published today by the researchers are based on a sample of cosmic markers with more than double. They also include an updated analysis of past data. And in total, 42 supernovae-it is known that Hubble witnessed aper year, it is estimated that …-is also useful in determining the distances of the Universe. So astronomers estimate, given the size of their sample, only once in a million, the probability “from an unlucky draw”. And give a Hubble constant value of about 73 km/s/MPc. Very accurate 73.04 +/- 1.04 km/s/Mpc.
The problem is that from the measurements of(European Space Agency, ESA) in our primitive universe and according to , theorists predicted a value of the Hubble constant to be 67.5 plus or minus 0.5 km/s/MPc. So where does this difference come from? Astronomers still don’t know. But it is possible that they will find the answer somewhere in the new laws . A tests, for example, to explain the difference using a “world » invisible particles that interact only with our world by the .