“We have interesting accounts of prediction of lunar eclipses, for example—one of the things this object presumably was able to do.” Hume’s argument is successful because it is epistemological, i.e., focused on what we can know. Hume isn’t really saying a necessary being is ‘impossible’, just that it is impossible for us to know that such a being exists. Aquinas, Leibniz and Craig say that it is a being with the property of the impossibility of non-existence, but Hume simply throws up his hands and says he cannot see how anyone can ascribe meaning to that statement. We might technically be able to understand the words, but we cannot conceive or understand how they could map onto reality. “there is an evident absurdity in pretending to demonstrate a matter of fact, or to prove it by any arguments a priori” – Hume. Copleston’s argument is successful because the ‘brute fact’ argument is self-defeating.
Therefore, we are empirically justified in accepting the causal principle. Lawrence Krauss & Alan Guth add evidence from modern theoretical physics which resonates with Hume’s point.
The Galaxy and M31 are both spiral galaxies, and they are among the brighter and more massive of all spiral galaxies. The most luminous and brightest galaxies, however, are not spirals but rather supergiant ellipticals . Laboratory for High Energy Astrophysics NASA Goddard Space Flight Center.
How Astronomers Revolutionized Our View of the Cosmos
The Big Bang model is typically broken down into a few key eras and events. Standard cosmology, the set of ideas that are most reliable in helping decipher the universe’s history, applies from the present time back to about a hundredth of second after the Big Bang. But before then, particle physics and quantum cosmology ruled the universe. BIG-TIME THEORY. The discovery of the cosmic microwave background confirmed the Big Bang theory. The CMB’s clumpiness gives astronomers evidence for theories ranging from what our universe’s contents are to how modern structure formed.
The rotational speed is much faster than what the gravitional pull by stars would allow . The Earth is revolving around the Sun, and our solar system is revolving in our galaxy, in the sea of dark matter, but there is no sign that we are slowing down. It means that Dark Matter particles are very shy and interact very little with us. However, forthcoming experiments are poised to detect the mysterious Dark Matter particles. We study the existing constraints from the data, develop theories of candidates for Dark Matter particles, and predict their properties. One of the best candidates for Dark Matter is the lightestsupersymmetric particle. General relativity had predicted a phenomenon called gravitational waves—ripples in spacetime produced by the movement of massive objects.
These depend on the amount of matter filling space as well as whether or not the cosmological constant is present, and if so, how dominant it is. Mack joined dark matter researcher Ken Clark to share their insights into the ubiquitous, mysterious stuff that seems to have been essential to the formation of galaxies. Physicist and jazz musician Stephon Alexander muses about the interplay of jazz, physics, and math. And cosmologist Katie Mack unpacks the latest thinking about the mysteries of dark matter, as part of the Perimeter Institute Public Lecture series. Every night, astronomers post new ideas to arXiv, the open access publishing site. Cosmologists, in particular, use arXiv to engage in timely back-and-forths that formal journals don’t permit.
Webb and Hubble telescopes unite to image flashy clash of galaxies cluster
Without observational constraints, there are a number of candidates, such as a stable supersymmetric particle, a weakly interacting massive particle, a gravitationally-interacting massive particle, an axion, and a massive compact halo object. Alternatives to the dark matter hypothesis include a modification of gravity at small accelerations or an effect from brane cosmology. TeVeS is a version of MOND that can explain gravitational lensing. Dramatic advances in observational cosmology since the 1990s, including the cosmic microwave background, distant supernovae and galaxy redshift surveys, have led to the development of a standard model of cosmology. This model requires the universe to contain large amounts of dark matter and dark energy whose nature is currently not well understood, but the model gives detailed predictions that are in excellent agreement with many diverse observations.
Images from the European Space Agency’s newest telescope show the power of instruments that will create 3D surveys of a third of the sky, covering 10 billion years of cosmic history. Over the past few years, scientists like Scolnic have investigated those first two hypothetical misunderstandings. They’ve whittled down their error bars, hardened their methods, re-analyzed the results of competitors and colleagues, and gathered sharper and bigger data. There are a few clues that the Universe isn’t completely adding up. Even so, the standard model of cosmology holds up stronger than ever.
Read more about Cosmology here.
Rather than a flat disc, Anaximander believed the Earth to be cylindrical and column-shaped. Furthermore, he proposed that the Earth was not fixed at a particle place but was suspended in space without support. His books include “The Science of Shakespeare” and “In Search of Time.” At a recent conference in Germany, Shostak bet the scientists in attendance that we’d find an alien signal within 24 years. (It wasn’t a huge wager — he only offered to buy each scientist a coffee if he turned out to be wrong.) By then, thanks to more efficient search techniques, we’ll likely have checked a million star systems. Why implementing an individual development plan process is a smart move for organizations today, and how to get started. This short story is a fictional account of two very real people — Anaximander and Anaximenes, two ancient Greeks who tried to make sense of the universe.