Lectures on Astronomy, Astrophysics, and
... Even in Messier’s time it was clear that these extended objects are not all the same. Some are star clusters, groups of stars which are so numerous that they appeared to be a cloud. Others are glowing clouds of gas or dust and it is for these that we now mainly reserve the word nebula. Most fascinat ...
... Even in Messier’s time it was clear that these extended objects are not all the same. Some are star clusters, groups of stars which are so numerous that they appeared to be a cloud. Others are glowing clouds of gas or dust and it is for these that we now mainly reserve the word nebula. Most fascinat ...
Searching for Dwarf Galaxies and Population III Star
... length scale over which these sources are discovered will reveal or set a lower limit on the size of the local bubble. The exposure time of 4 hours will allow detections in the range of ~6 x 10-19 erg/s/cm2. 2. If we discover multiple strong Lyman sources in the first phase of the project, we will ...
... length scale over which these sources are discovered will reveal or set a lower limit on the size of the local bubble. The exposure time of 4 hours will allow detections in the range of ~6 x 10-19 erg/s/cm2. 2. If we discover multiple strong Lyman sources in the first phase of the project, we will ...
Cosmic distance scales - Inside Mines
... The Universe is a really big place • Planets – from the greek word meaning “wanderers” • Stars – our sun is a very typical star • Classified as a function of luminosity / surface temperature • At various stages of life: giant, supergiant... • Dying or dead: white / brown dwarves, neutron stars, pul ...
... The Universe is a really big place • Planets – from the greek word meaning “wanderers” • Stars – our sun is a very typical star • Classified as a function of luminosity / surface temperature • At various stages of life: giant, supergiant... • Dying or dead: white / brown dwarves, neutron stars, pul ...
DAVID A. RIETHMILLER - Department of Physics and Astronomy
... Ph.D. Thesis Topic – Ohio University (current): My current research explores the hydrodynamic history of elliptical galaxies, simulating various prescriptions for interstellar gas cooling and AGN energy feedback against real X-ray observations of ellipticals. The goal is to isolate those prescriptio ...
... Ph.D. Thesis Topic – Ohio University (current): My current research explores the hydrodynamic history of elliptical galaxies, simulating various prescriptions for interstellar gas cooling and AGN energy feedback against real X-ray observations of ellipticals. The goal is to isolate those prescriptio ...
NuSeti-2015 - Department of Physics and Astronomy
... Dyson shell(or Sphere) is a name for stars which are being harnessed by advanced civilizations and have energy being expended to sustain them, using up most of the radiation energy by having a bunch of absorbers around the star (Also possible, is mining a macroscopic black hole formed from a star wi ...
... Dyson shell(or Sphere) is a name for stars which are being harnessed by advanced civilizations and have energy being expended to sustain them, using up most of the radiation energy by having a bunch of absorbers around the star (Also possible, is mining a macroscopic black hole formed from a star wi ...
The Electric Climate versus Flat-Earth Science
... story of the Sun being a constantly exploding hydrogen bomb sounds too much like a fairy tale where everything is simple and the improbable magically happens. There is another major piece of evidence that doesn't fit either. If the Sun was a giant nuclear fusion furnace heated from within, why would ...
... story of the Sun being a constantly exploding hydrogen bomb sounds too much like a fairy tale where everything is simple and the improbable magically happens. There is another major piece of evidence that doesn't fit either. If the Sun was a giant nuclear fusion furnace heated from within, why would ...
The Intricate Role of Cold Gas and Dust in Galaxy Evolution at Early
... Spectral Energy Distribution ...
... Spectral Energy Distribution ...
Active Galactic Nuclei: are they important?
... It is most likely the early stage of a quasar reactivation. Hryniewicz, Czerny, Nikołajuk, Kuraszkiewicz 2009. ...
... It is most likely the early stage of a quasar reactivation. Hryniewicz, Czerny, Nikołajuk, Kuraszkiewicz 2009. ...
The cosmic distance scale
... a Cepheid with the leftmost slider, then sliding the period slider or typing in a value. The upper plot shows the measured data (from the Table) and the lower plot a version with all measure-points included in all periods. When this curve becomes continous, the period has been found for that Cepheid ...
... a Cepheid with the leftmost slider, then sliding the period slider or typing in a value. The upper plot shows the measured data (from the Table) and the lower plot a version with all measure-points included in all periods. When this curve becomes continous, the period has been found for that Cepheid ...
First Light Sources at the End of the Dark Ages: Direct
... helium, the very first stars were metal-free (Population III). Their formation and evolution hold key clues that can establish how the Universe was subsequently enriched with metals, and how and when massive galaxies containing Population II stars formed. There is an apparent chemical enrichment “fl ...
... helium, the very first stars were metal-free (Population III). Their formation and evolution hold key clues that can establish how the Universe was subsequently enriched with metals, and how and when massive galaxies containing Population II stars formed. There is an apparent chemical enrichment “fl ...
Galaxies – Island universes
... the first billion years or so after the Big Bang • Many have later infalling matter which has been pulled on by nearby mass and thus doesn’t fall straight in. It settles into a rotating disk, arranging itself into a flat, roughly circularly orbiting plane of material • This material gradually conden ...
... the first billion years or so after the Big Bang • Many have later infalling matter which has been pulled on by nearby mass and thus doesn’t fall straight in. It settles into a rotating disk, arranging itself into a flat, roughly circularly orbiting plane of material • This material gradually conden ...
Magnificent Cosmos - Academic Program Pages at Evergreen
... pivoting around a point just outside its surface. To detect holds that planets form from a flat, spinning disk of gas and planets around other stars, measurements must be highly dust that bulges out of a star’s equatorial plane, much as accurate, with errors in stellar velocities below 10 meters piz ...
... pivoting around a point just outside its surface. To detect holds that planets form from a flat, spinning disk of gas and planets around other stars, measurements must be highly dust that bulges out of a star’s equatorial plane, much as accurate, with errors in stellar velocities below 10 meters piz ...
File
... * A long time ago, astronomers thought that the Earth was the centre of the Universe. This was called the geocentric model. The evidence for this model came from observations of the sky using the naked eye. After the telescope was invented, astronomers quickly gathered evidence which showed that the ...
... * A long time ago, astronomers thought that the Earth was the centre of the Universe. This was called the geocentric model. The evidence for this model came from observations of the sky using the naked eye. After the telescope was invented, astronomers quickly gathered evidence which showed that the ...
The Cosmos & the Bible
... • Most common young-earth view • Universe very large, but only some 10,000 years old • Since most objects visible in large telescopes are more than 10,000 light-years away, the light coming from them must have been created on the way. ...
... • Most common young-earth view • Universe very large, but only some 10,000 years old • Since most objects visible in large telescopes are more than 10,000 light-years away, the light coming from them must have been created on the way. ...
Lecture07-ASTA01 - University of Toronto
... Early materialist philosophers: Leucippus and Democritus ...
... Early materialist philosophers: Leucippus and Democritus ...
Supermassive Black Holes and the Growth of Galaxies
... many billions of tonnes!). This object would then be so massive and yet so small that the escape velocity at its surface would be equal to the speed of light. Since nothing in the Universe can travel faster than light, we infer that nothing can escape this object’s strong gravitational field. Such a ...
... many billions of tonnes!). This object would then be so massive and yet so small that the escape velocity at its surface would be equal to the speed of light. Since nothing in the Universe can travel faster than light, we infer that nothing can escape this object’s strong gravitational field. Such a ...
Vacuum Bubbles Nucleation and Dark Matter Production through
... The modern paradigms of physics are the standard Big Bang model of cosmology and the standard SU(3)C ⊗ SU(2)L ⊗ U(1)Y model of the strong and electroweak interactions. During the past two decades both models have been refined with the addition of two key ingredients: inflation on the cosmological si ...
... The modern paradigms of physics are the standard Big Bang model of cosmology and the standard SU(3)C ⊗ SU(2)L ⊗ U(1)Y model of the strong and electroweak interactions. During the past two decades both models have been refined with the addition of two key ingredients: inflation on the cosmological si ...
Chapter 20. Galaxies
... infalling gas to radiation, is capable of such efficient energy generation on such a small scale! An extreme example of the AGN phenomenon are the so-called Quasars. The term quasar is short for quasi-stellar object (QSO). These are now recognized as very active AGNs that are predominantly found at ...
... infalling gas to radiation, is capable of such efficient energy generation on such a small scale! An extreme example of the AGN phenomenon are the so-called Quasars. The term quasar is short for quasi-stellar object (QSO). These are now recognized as very active AGNs that are predominantly found at ...
Inertia First?
... Therefore the position coordinates in the trajectory will not be modified by the transforms. (If length contraction and the associated time displacement are added, these transformations can be applied to special relativity and are sufficient to explain the “fly-by principle,” i.e. that a relativisti ...
... Therefore the position coordinates in the trajectory will not be modified by the transforms. (If length contraction and the associated time displacement are added, these transformations can be applied to special relativity and are sufficient to explain the “fly-by principle,” i.e. that a relativisti ...
second grade - Math/Science Nucleus
... light. While these objects also shine or reflect light during the day, we generally cannot see them because they are much dimmer than the bright light emitted by the nearby Sun. Most of the light we see at night comes from within our own galaxy, the Milky Way. Some points of light, however, are from ...
... light. While these objects also shine or reflect light during the day, we generally cannot see them because they are much dimmer than the bright light emitted by the nearby Sun. Most of the light we see at night comes from within our own galaxy, the Milky Way. Some points of light, however, are from ...
Physical cosmology
Physical cosmology is the study of the largest-scale structures and dynamics of the Universe and is concerned with fundamental questions about its origin, structure, evolution, and ultimate fate. For most of human history, it was a branch of metaphysics and religion. Cosmology as a science originated with the Copernican principle, which implies that celestial bodies obey identical physical laws to those on Earth, and Newtonian mechanics, which first allowed us to understand those physical laws.Physical cosmology, as it is now understood, began with the development in 1915 of Albert Einstein's general theory of relativity, followed by major observational discoveries in the 1920s: first, Edwin Hubble discovered that the universe contains a huge number of external galaxies beyond our own Milky Way; then, work by Vesto Slipher and others showed that the universe is expanding. These advances made it possible to speculate about the origin of the universe, and allowed the establishment of the Big Bang Theory, by Georges Lemaitre, as the leading cosmological model. A few researchers still advocate a handful of alternative cosmologies; however, most cosmologists agree that the Big Bang theory explains the observations better.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.Cosmology draws heavily on the work of many disparate areas of research in theoretical and applied physics. Areas relevant to cosmology include particle physics experiments and theory, theoretical and observational astrophysics, general relativity, quantum mechanics, and plasma physics.