Ever since the discovery of the expansion of the universe, or nearly so, the question has plagued astrophysicists. How fast is this expansion going today? Because observation and theory don’t give the same answer. Today, the Hubble Space Telescope provides additional precision.
Our history of the universe begins about 13.7 billion years ago in an extremely dense and hot soup. The laws of physics as we…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/1/5/5/1557798396_80921_universe.jpg” data-url=”https : //news.google.com/sciences/definitions/astronomy-universe-15239/” data-more=”Read more”>expands. there is no doubt. What is being discussed is velocity, which has a direction and an intensity represented by a vector, the velocity vector. Relative velocity is the velocity of one body relative to another or relative to a frame.” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/3/1/9/319daf63f4_77541_leibniz-dp . jpg” data-url=”https://news.google.com/sciences/definitions/physics-velocity-324/” data-more=”Read definition”> that continues today . Its current expansion rate – which is translated by what the christened it the Hubble constant. It was a tribute to the American He entered the Yerkes Observatory, where he wrote a remarkable dissertation on nebulae, which earned him a place at…” data-image=”https://cdn.futura-sciences.com/ buildsv6/images /midioriginal/7/a/5/7a55fb5c4d_50142198_hubble-700.jpg” data-url=”https://news.google.com/sciences/personalities/astronomy-edwin-hubble-715/” data-more =”Read more”> who discovered the phenomenon of the expansion of the universe and carried out the first measurements on it in the 1920s. And the homage continues to grow today as researchers unveil new things more precise than ever. Obtained from data collected by the for more than 30 years .
It is worth remembering that measurement was precisely one of the main reasons for the existence of this instrument. Efforts made as early as the 1970s aimed at developing a tool to resolve Cepheids. For the Cepheidhave long served as cosmic markers, a sort of standard meter for . Exactly since 1912. They can be seen both in our Milky Way and in us 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 main goal of refining the measurement of the distances of galaxies close to us. In the early 2000s, the efforts ofwere rewarded. They were thus able to derive a value from the with an accuracy of 10%. A value of 72 plus or minus 8 kilometers per second per megaparsec (km/s/Mpc).
Which value is correct?
To refine this value, the researchers then added new cameras to the space telescope. With the idea of achieving 1% accuracy. One idea in particular led to the collaboration Supernova, H0, for the dark energy equation of state (SH0ES).
The new results published today by the researchers are therefore based on a more than doubled sample of cosmic markers. They also include an updated analysis of past data. And a total of 42 supernovae – knowing that Hubble witnessed oneper year, approximately… – also useful for determining distances in the Universe. Therefore, given the size of their sample, astronomers estimate the possibility to be only one in a million “from an unfortunate lot”. Give the Hubble constant a value of about 73 km/s/Mpc. Very accurate 73.04 +/- 1.04 km/s/Mpc.
The problem is that from the measurements of the
Physics…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/8/9/6/896f032c90_91933_physics-def.jpg” data-url=”https:// news .google.com/science/definitions/physics-physics-15839/” data-more=”Read more”> . A tries, for example, to explain the discrepancy with a ” World » invisible particles that would only interact with our world about that .
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