Beyond Our Solar System
... Fate of the universe • Final fate depends on density of the universe –If density is more than the critical density, universe will contract –Current estimates are less than critical density • Predicts ever-expanding,or open, universe ...
... Fate of the universe • Final fate depends on density of the universe –If density is more than the critical density, universe will contract –Current estimates are less than critical density • Predicts ever-expanding,or open, universe ...
The Milky Way Galaxy (ch. 23)
... roughly spherical “halo.” (23.9) So we already have an answer to part of question 2 above: The oldest stars in our galaxy are distributed in space in a roughly spherical halo, consisting mostly of the globular clusters. This tells us that, since these stars are all old and metal-poor, our Galaxy pro ...
... roughly spherical “halo.” (23.9) So we already have an answer to part of question 2 above: The oldest stars in our galaxy are distributed in space in a roughly spherical halo, consisting mostly of the globular clusters. This tells us that, since these stars are all old and metal-poor, our Galaxy pro ...
Galaxies
... probably because of collisions with intracluster gas It is believed this gas is primordial—dating from the very early days of the Universe. There is not nearly enough of it to account for most of the matter in galaxy clusters. ...
... probably because of collisions with intracluster gas It is believed this gas is primordial—dating from the very early days of the Universe. There is not nearly enough of it to account for most of the matter in galaxy clusters. ...
Dark Matter -24-------------------------------~-----------R-E-S-O-N-A-N-C
... types of stars, and its mass-to-light ratio will be some average of the values for the different types. If the relative numbers of the different types of stars, i.e. the composition of the stellar population, is approximately the same in all parts of a galaxy, then its surface mass density, which we ...
... types of stars, and its mass-to-light ratio will be some average of the values for the different types. If the relative numbers of the different types of stars, i.e. the composition of the stellar population, is approximately the same in all parts of a galaxy, then its surface mass density, which we ...
File
... galaxies. Active galaxies that emit much energy at radio wavelengths are radio galaxies. Very distant, extremely bright, radio-energy emitters are quasars (quasi-stellar radio source). The power source of active galaxies is likely due to energy interactions with super-massive black holes. Our Galaxy ...
... galaxies. Active galaxies that emit much energy at radio wavelengths are radio galaxies. Very distant, extremely bright, radio-energy emitters are quasars (quasi-stellar radio source). The power source of active galaxies is likely due to energy interactions with super-massive black holes. Our Galaxy ...
Lecture Notes
... distant us. The elliptical galaxies congregate toward the central regions while the few spirals that occur are found on the outskirts. Two giant ellipticals (NGC 4874 & NGC 4889) occupy the central part of the cluster. Other rich clusters show the same segregation of the spirals from the ellipticals ...
... distant us. The elliptical galaxies congregate toward the central regions while the few spirals that occur are found on the outskirts. Two giant ellipticals (NGC 4874 & NGC 4889) occupy the central part of the cluster. Other rich clusters show the same segregation of the spirals from the ellipticals ...
HIERARCHICAL GALAXY ASSEMBLY AND ITS MANIFESTATIONS
... luminosity and colour like single stellar population models, with epoch of formation z~3-5: passive evolution Hierarchical semi-analytic models produce slower and more prolonged evolution, and lower masses at high redshift, ...
... luminosity and colour like single stellar population models, with epoch of formation z~3-5: passive evolution Hierarchical semi-analytic models produce slower and more prolonged evolution, and lower masses at high redshift, ...
Frontiers of Physics - Wright State University
... no center of expansion in the universe. All observers see themselves as stationary; the other objects in space appear to be moving away from them. Hubble was directly responsible for discovering that the universe was much larger than had previously been imagined and that it had this amazing characte ...
... no center of expansion in the universe. All observers see themselves as stationary; the other objects in space appear to be moving away from them. Hubble was directly responsible for discovering that the universe was much larger than had previously been imagined and that it had this amazing characte ...
Chapter 34 - mrphysicsportal.net
... no center of expansion in the universe. All observers see themselves as stationary; the other objects in space appear to be moving away from them. Hubble was directly responsible for discovering that the universe was much larger than had previously been imagined and that it had this amazing characte ...
... no center of expansion in the universe. All observers see themselves as stationary; the other objects in space appear to be moving away from them. Hubble was directly responsible for discovering that the universe was much larger than had previously been imagined and that it had this amazing characte ...
Milky Way Galaxy
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
The solar system rotates around the sun due to the sun`s
... Scientist have studied nine different stars (A-I) and nine different galaxies (1-9). T hey documented what percent of shift each star and galaxies had. T he data is shown below. Which statement below best supports the data? A ...
... Scientist have studied nine different stars (A-I) and nine different galaxies (1-9). T hey documented what percent of shift each star and galaxies had. T he data is shown below. Which statement below best supports the data? A ...
The Universe Section 1
... • Energy moves slowly through the layers of a star. – Energy moves through the layers of a star by convection and radiation. – During convection, hot gas moves upward, away from the star’s center, and cooler gas sinks toward the center. – During radiation, atoms absorb energy and transfer it to othe ...
... • Energy moves slowly through the layers of a star. – Energy moves through the layers of a star by convection and radiation. – During convection, hot gas moves upward, away from the star’s center, and cooler gas sinks toward the center. – During radiation, atoms absorb energy and transfer it to othe ...
The Classification of Galaxies By Daniel Underwood Contents The
... accepted by astronomers that there were other galaxies than our own in the cosmos. However, it wasn’t immediately recognised that these nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, but actually massive collections of stars. These masses outside the ...
... accepted by astronomers that there were other galaxies than our own in the cosmos. However, it wasn’t immediately recognised that these nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, but actually massive collections of stars. These masses outside the ...
Supermassive black holes
... Edwin Hubble used observations of _______ to determine the distance to the ...
... Edwin Hubble used observations of _______ to determine the distance to the ...
Galaxies Galaxies M81
... This image shows the spiral galaxy NGC 4319 and the quasar Markarian 205. The distance to NGC is 80 million light years, which Mkn 205 is 14 times farther away at a distance of 1 billion light year. The very distant quasar is nearly as bright as the much closer galaxy. The extraordinary brightness o ...
... This image shows the spiral galaxy NGC 4319 and the quasar Markarian 205. The distance to NGC is 80 million light years, which Mkn 205 is 14 times farther away at a distance of 1 billion light year. The very distant quasar is nearly as bright as the much closer galaxy. The extraordinary brightness o ...
What Do We Really Know About the Universe?
... "We take the side of science in spite of the patent absurdity of some of its constructs, in spite of the failure to fulfill many of its extravagant promises of health and life, in spite of the tolerance of the scientific community for unsubstantiated just-so stories, because we have a prior commitme ...
... "We take the side of science in spite of the patent absurdity of some of its constructs, in spite of the failure to fulfill many of its extravagant promises of health and life, in spite of the tolerance of the scientific community for unsubstantiated just-so stories, because we have a prior commitme ...
P3A3B Particles and Quanta Notes 2013
... The Universe, 14 billion years ago, BIG BANG, an explosion of spacetime from a single point. Our star, formed 5 billion years ago, has taken around 4 billion years for quasi-intelligent live to emerge. 100 billion stars in the Milky Way Galaxy. 100 billion visible galaxies. “There’s got to be intell ...
... The Universe, 14 billion years ago, BIG BANG, an explosion of spacetime from a single point. Our star, formed 5 billion years ago, has taken around 4 billion years for quasi-intelligent live to emerge. 100 billion stars in the Milky Way Galaxy. 100 billion visible galaxies. “There’s got to be intell ...
PDF - Amazing Space, STScI
... Peering into the crowded bulge of our Milky Way galaxy, Hubble looked farther than ever before to nab a group of planet candidates outside our solar system. Astronomers used Hubble to conduct a census of Jupiter-sized extrasolar planets residing in the bulge of our Milky Way galaxy. Looking at a nar ...
... Peering into the crowded bulge of our Milky Way galaxy, Hubble looked farther than ever before to nab a group of planet candidates outside our solar system. Astronomers used Hubble to conduct a census of Jupiter-sized extrasolar planets residing in the bulge of our Milky Way galaxy. Looking at a nar ...
Hubble Space Telescope`s
... Peering into the crowded bulge of our Milky Way galaxy, Hubble looked farther than ever before to nab a group of planet candidates outside our solar system. Astronomers used Hubble to conduct a census of Jupiter-sized extrasolar planets residing in the bulge of our Milky Way galaxy. Looking at a nar ...
... Peering into the crowded bulge of our Milky Way galaxy, Hubble looked farther than ever before to nab a group of planet candidates outside our solar system. Astronomers used Hubble to conduct a census of Jupiter-sized extrasolar planets residing in the bulge of our Milky Way galaxy. Looking at a nar ...
Instructor`s Guide
... • New ideas in science are limited by the context in which they are conceived; are often rejected by the scientific establishment; sometimes spring from unexpected findings; and usually grow slowly, through contributions from many investigators. The Physical Setting: The Universe • The stars diffe ...
... • New ideas in science are limited by the context in which they are conceived; are often rejected by the scientific establishment; sometimes spring from unexpected findings; and usually grow slowly, through contributions from many investigators. The Physical Setting: The Universe • The stars diffe ...
Intelligent life in cosmology
... we have an undeniable fact : they aren’t here. That is, extraterrestrial intelligent beings are not obviously present on our planet, or in our solar system. I think even Martin will agree with this ! But I claim this fact allows us to conclude that extraterrestrial intelligence (ETI) is absence from ...
... we have an undeniable fact : they aren’t here. That is, extraterrestrial intelligent beings are not obviously present on our planet, or in our solar system. I think even Martin will agree with this ! But I claim this fact allows us to conclude that extraterrestrial intelligence (ETI) is absence from ...
Why Study Cosmic Near Infrared Background? (1-4um)
... The SKA data should be correlated with CMB, and WMAP data are good enough! It is even plausible that the first convincing evidence for 21-cm from reionization would come from the cross-correlation signal. ...
... The SKA data should be correlated with CMB, and WMAP data are good enough! It is even plausible that the first convincing evidence for 21-cm from reionization would come from the cross-correlation signal. ...
Astronomy Talk July 2016 - Unitarian Universalist Church of
... Let this, then, be the ground of my faith: All that we know, now and forever, all scientific knowledge that we have of this world, or will ever have, is as an island in the sea [of mystery]…We live in our partial knowledge as the Dutch live on polders claimed from the sea. We dike and fill. We dredg ...
... Let this, then, be the ground of my faith: All that we know, now and forever, all scientific knowledge that we have of this world, or will ever have, is as an island in the sea [of mystery]…We live in our partial knowledge as the Dutch live on polders claimed from the sea. We dike and fill. We dredg ...
Science and the Universe - Wayne State University Physics and
... From our location within the Galaxy, we cannot see through its far rim because the space between stars is not empty, but contains (an extremely sparse distribution of) interstellar dust or gas which absorbs visible light The interstellar gas and dust are believed to be the raw material for future fo ...
... From our location within the Galaxy, we cannot see through its far rim because the space between stars is not empty, but contains (an extremely sparse distribution of) interstellar dust or gas which absorbs visible light The interstellar gas and dust are believed to be the raw material for future fo ...
Answers - Physics and Astronomy
... QUESTION 1: Some recent measurements of the expansion rate of the universe suggest a problem with our old ideas about how the universe should be expanding. What is the problem? a. The measurements suggest that the universe may be shrinking rather than expanding. b. The measurements indicate that the ...
... QUESTION 1: Some recent measurements of the expansion rate of the universe suggest a problem with our old ideas about how the universe should be expanding. What is the problem? a. The measurements suggest that the universe may be shrinking rather than expanding. b. The measurements indicate that the ...
Observable universe
The observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth at the present time because light and other signals from these objects has had time to reach the Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. That is, the observable universe is a spherical volume (a ball) centered on the observer. Every location in the Universe has its own observable universe, which may or may not overlap with the one centered on Earth.The word observable used in this sense does not depend on whether modern technology actually permits detection of radiation from an object in this region (or indeed on whether there is any radiation to detect). It simply indicates that it is possible in principle for light or other signals from the object to reach an observer on Earth. In practice, we can see light only from as far back as the time of photon decoupling in the recombination epoch. That is when particles were first able to emit photons that were not quickly re-absorbed by other particles. Before then, the Universe was filled with a plasma that was opaque to photons.The surface of last scattering is the collection of points in space at the exact distance that photons from the time of photon decoupling just reach us today. These are the photons we detect today as cosmic microwave background radiation (CMBR). However, with future technology, it may be possible to observe the still older relic neutrino background, or even more distant events via gravitational waves (which also should move at the speed of light). Sometimes astrophysicists distinguish between the visible universe, which includes only signals emitted since recombination—and the observable universe, which includes signals since the beginning of the cosmological expansion (the Big Bang in traditional cosmology, the end of the inflationary epoch in modern cosmology). According to calculations, the comoving distance (current proper distance) to particles from the CMBR, which represent the radius of the visible universe, is about 14.0 billion parsecs (about 45.7 billion light years), while the comoving distance to the edge of the observable universe is about 14.3 billion parsecs (about 46.6 billion light years), about 2% larger.The best estimate of the age of the universe as of 2015 is 7010137990000000000♠13.799±0.021 billion years but due to the expansion of space humans are observing objects that were originally much closer but are now considerably farther away (as defined in terms of cosmological proper distance, which is equal to the comoving distance at the present time) than a static 13.8 billion light-years distance. It is estimated that the diameter of the observable universe is about 28 gigaparsecs (91 billion light-years, 8.8×1026 metres or 5.5×1023 miles), putting the edge of the observable universe at about 46–47 billion light-years away.