#speedoflight — Public Fediverse posts

#SpeedOfLight GRT explains phenomena such as so-called gravitational lensing, in which massive objects bend light, generating captivating visual effects in the cosmos.

#SpeedOfLight Observations from the James Webb Space Telescope confirm that the Hubble constant is 8 % larger than predicted by the Lambda-CDM theory. However, some researchers specializing in this topic say they are not entirely convinced that the discrepancy is real.

#SpeedOfLight All the observations we know describe a consistent picture of an expanding cosmos. #physics

#SpeedOfLight This non-uniform expansion of the universe leads to the formation of cosmic structures such as galaxies, clusters, and superclusters. #physics

#SpeedOfLight It has been proven that the expansion of the universe is not uniform. The ubiquitous gravitational pull causes regions with more mass to expand more slowly than regions with less mass. #physics

#SpeedOfLight The Planck probe is placed in an orbit around the L2 Sun-Earth Lagrange point, located 5 light seconds from Earth, to minimize interference generated by the Earth or the Moon on the telescope. #physics

#SpeedOfLight Planck, a European Space Agency satellite, launched on May 14, 2009, has a mirror 1.5 meters in diameter. It was designed to capture radiation in two frequency bands, one high and one low. It was active until October 2013. #physics

The Number on the Wall: Why Physicists Call 137 Magic

https://bolesblogs.com/2026/06/03/the-number-on-the-wall-why-physicists-call-137-magic/

#SpeedOfLight The Lambda-CDM model with just six parameters (including the Hubble constant) can explain the CMB temperature fluctuations measured by the Planck spacecraft. #physics

#SpeedOfLight According to the Lambda-Cold Dark Matter (Lambda-CDM) model, dark matter is something cold and invisible that only shows up, indirectly, through its gravitational effects. #physics

#SpeedOfLight Dark energy, according to the Lambda-cold dark matter (Lambda-CDM) model, is a property of empty space, which in other models is called the cosmological constant and is represented by lambda. #physics

#SpeedOfLight As the universe grew in size, the push of dark energy was greater than the pull of gravity, so after slowing down, the expansion of the universe is now clearly accelerating. #physics

#SpeedOfLight The dark matter appears to have accumulated in certain areas. Billions of years later, ordinary matter began to form galaxies in regions where dark matter was predominant. First-ever image of dark matter? #physics

#SpeedOfLight The universe grew exponentially in the first moments of the Big Bang, producing small quantum fluctuations in the dense soup of fundamental particles in which it found itself at that time. #physics

Given the metric tensor g_ij, with i and j being 0, 1, 2 or 3 at a given point in space. We also have a fixed three dimensional unit vector e^i with i being 1, 2 or 3. Using Einstein Notation define

\alpha = (1/g_{ij} e^i e^j) \left( \sqrt{ (g_{0i} e^i)^2 - g_{00}} - g_0i e^i \right)

Can we show that alpha is invariant under coordinate transformation. I asked an AI, said "yes". But????

Why should this be possible? See here: https://blog.miamao.de/blog/Speed_of_Light_from_Metric.html

#physics #GR #metric #speedoflight

#SpeedOfLight We believe that the universe currently contains 5% ordinary matter, 27% invisible dark matter (which holds galaxies together), and 68% dark energy (which tightens and stretches space like air in a bubble). #physics

#SpeedOfLight Astrophysicists are confident that solving the Hubble tension could help cosmologists better understand the composition and evolution of the universe. There are also more skeptical opinions. #physics

#SpeedOfLight The most recent observations from NASA's James Webb Space Telescope (JWST) have confirmed some disparity between the values of the Hubble constant. This controversy or debate even has a name: Hubble tension. #physics

#SpeedOfLight Astrophysicists measuring in the farthest reaches of the cosmos are getting closer and closer to the initial moment of the Big Bang, to the flare that produced the radiation that permeates the entire universe, the cosmic microwave background (CMB). #physics

#SpeedOfLight Scientists are trying to understand the nature of dark energy and its crucial role in shaping the fate of the universe.

#SpeedOfLight In more distant galaxies an expansion velocity is obtained that is significantly smaller than in closer galaxies. #physics

#SpeedOfLight Expansion velocity measurements made in our cosmic neighborhood are not enteral compatible with other measurements carried out in more distant galaxies. #physics

#SpeedOfLight The Big Bang theory was controversial for several decades. Numerous attempts were made to accurately measure the rate at which the universe is expanding, the so-called Hubble constant. #physics

#SpeedOfLight The spectacular concept of the expansion of the universe has given rise to new fields of study, such as experimental cosmology (data acquisition and observations) and the search for dark energy. #physics

#SpeedOfLight Less than a century ago, very strong evidence was found that the expansion of the universe means that galaxies are moving away from each other, and at the same time the light they emit is increasing its wavelength (red shift). #physics

#SpeedOfLight The expansion of the universe has important implications for the fate of the cosmos. If the expansion continues to accelerate, as current observations suggest, it may result in a future where galaxies drift apart, leading to the "Big Freeze" scenario. #physics

#SpeedOfLight Observations of distant galaxies have revealed that the farther they are from us, the faster they move away. This fact is known as Hubble's law and provides strong evidence for the expansion of the universe. #physics

#SpeedOfLight This expansion rate of the universe determines how quickly galaxies move away from each other and gives us information about the age and future of the universe. #physics

#SpeedOfLight The expansion speed of the universe is described by the Hubble constant, named after astronomer Edwin Hubble, its discoverer. #physics

#SpeedOfLight The expansion of the universe is not like the expansion of an object as we observe it in everyday life. It is the fabric that makes up the universe itself that is stretching, pulling galaxies with it. #physics