![Lecture 5](http://s1.studyres.com/store/data/002633131_1-1079d8dddc8f69380ec5c7f973a33e86-300x300.png)
Lecture 5
... A nebula is an interstellar cloud of dust, hydrogen gas and plasma. Originally nebula was a general name for any extended astronomical object, including galaxies beyond the Milky Way. Nebulae often form star-forming regions, such as in the Eagle Nebula. This nebula is depicted in one of NASA's most ...
... A nebula is an interstellar cloud of dust, hydrogen gas and plasma. Originally nebula was a general name for any extended astronomical object, including galaxies beyond the Milky Way. Nebulae often form star-forming regions, such as in the Eagle Nebula. This nebula is depicted in one of NASA's most ...
Lesson 13 - Oregon State University
... Big Bang Nucleosynthesis After about 30 m, nucleosynthesis ceased. The temperature was ~ 3 x 108K and the density was ~ 30 kg/m3. Nuclear matter was 76% by mass protons, 24% alpha particles with traces of deuterium, 3He and 7Li. The /n/p ratio is 109/13/87. The relative ratio of p/4He/d/3He/7Li is ...
... Big Bang Nucleosynthesis After about 30 m, nucleosynthesis ceased. The temperature was ~ 3 x 108K and the density was ~ 30 kg/m3. Nuclear matter was 76% by mass protons, 24% alpha particles with traces of deuterium, 3He and 7Li. The /n/p ratio is 109/13/87. The relative ratio of p/4He/d/3He/7Li is ...
Slide 1
... A nebula is an interstellar cloud of dust, hydrogen gas and plasma. Originally nebula was a general name for any extended astronomical object, including galaxies beyond the Milky Way. Nebulae often form star-forming regions, such as in the Eagle Nebula. This nebula is depicted in one of NASA's most ...
... A nebula is an interstellar cloud of dust, hydrogen gas and plasma. Originally nebula was a general name for any extended astronomical object, including galaxies beyond the Milky Way. Nebulae often form star-forming regions, such as in the Eagle Nebula. This nebula is depicted in one of NASA's most ...
1 - Uplift North Hills Prep
... ● value of density determines whether or not universe will expand forever, or at some point, begin to contract; ● at density less than critical density, universe will expand forever; ● at density greater than critical density, universe will stop expanding and contract; If second and third marks gain ...
... ● value of density determines whether or not universe will expand forever, or at some point, begin to contract; ● at density less than critical density, universe will expand forever; ● at density greater than critical density, universe will stop expanding and contract; If second and third marks gain ...
Atoms and Starlight Generating light
... Light from hot solid objects is not made up of emission lines ...
... Light from hot solid objects is not made up of emission lines ...
Document
... ● value of density determines whether or not universe will expand forever, or at some point, begin to contract; ● at density less than critical density, universe will expand forever; ● at density greater than critical density, universe will stop expanding and contract; If second and third marks gain ...
... ● value of density determines whether or not universe will expand forever, or at some point, begin to contract; ● at density less than critical density, universe will expand forever; ● at density greater than critical density, universe will stop expanding and contract; If second and third marks gain ...
Astronomy – The Milky Way Galaxy
... Astronomy – The Milky Way Galaxy The ______________ _________ Galaxy ...
... Astronomy – The Milky Way Galaxy The ______________ _________ Galaxy ...
PowerPoint
... • Since wavelength increases • And photon energy decreases with longer wavelength • Photons lose energy as universe expands Dec 8, 2003 ...
... • Since wavelength increases • And photon energy decreases with longer wavelength • Photons lose energy as universe expands Dec 8, 2003 ...
pptx
... collisions between atoms and photons of light change photon energies result is continuous spectrum if object has no intrinsic colour (blackbody) spectrum depends only on its temperature hotter = bluer and brighter ...
... collisions between atoms and photons of light change photon energies result is continuous spectrum if object has no intrinsic colour (blackbody) spectrum depends only on its temperature hotter = bluer and brighter ...
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 ...
Galaxies
... Light from moving objects will appear to have different wavelengths depending on the relative motion of the source and the observer. Observers looking at an object that is moving away from them see light that has a longer wavelength than it had when it was emitted (a redshift), while observers looki ...
... Light from moving objects will appear to have different wavelengths depending on the relative motion of the source and the observer. Observers looking at an object that is moving away from them see light that has a longer wavelength than it had when it was emitted (a redshift), while observers looki ...
Will Dark Energy Tear the Universe Apart?
... all type Ia supernovae originate from white dwarfs of the same mass, they all have a similar luminosity. Both groups observed the light curves from type Ia supernovae and found that the more distant supernovae (which are from an earlier time) were dimmer than expected if the universe was expanding a ...
... all type Ia supernovae originate from white dwarfs of the same mass, they all have a similar luminosity. Both groups observed the light curves from type Ia supernovae and found that the more distant supernovae (which are from an earlier time) were dimmer than expected if the universe was expanding a ...
Earth apart.
... all type Ia supernovae originate from white dwarfs of the same mass, they all have a similar luminosity. Both groups observed the light curves from type Ia supernovae and found that the more distant supernovae (which are from an earlier time) were dimmer than expected if the universe was expanding a ...
... all type Ia supernovae originate from white dwarfs of the same mass, they all have a similar luminosity. Both groups observed the light curves from type Ia supernovae and found that the more distant supernovae (which are from an earlier time) were dimmer than expected if the universe was expanding a ...
What kind of stuff
... • Emission lines arise from gas “ionized” by very energetic radiation • Such high energy radiation is NOT produced by cold old stars, implying that very young stars (10 million years old) are present. • They also contain vast amounts of gas and dust ...
... • Emission lines arise from gas “ionized” by very energetic radiation • Such high energy radiation is NOT produced by cold old stars, implying that very young stars (10 million years old) are present. • They also contain vast amounts of gas and dust ...
Lecture2 - UCSB Physics
... • Emission lines arise from gas “ionized” by very energetic radiation • Such high energy radiation is NOT produced by cold old stars, implying that very young stars (10 million years old) are present. • They also contain vast amounts of gas and dust ...
... • Emission lines arise from gas “ionized” by very energetic radiation • Such high energy radiation is NOT produced by cold old stars, implying that very young stars (10 million years old) are present. • They also contain vast amounts of gas and dust ...
Astronomy (stars, galaxies and the Universe)
... Does not give off electromagnetic energy and can not be seen directly Estimated to make up 23% of the Universe’s mass ...
... Does not give off electromagnetic energy and can not be seen directly Estimated to make up 23% of the Universe’s mass ...
File - Philosophy, Theology, History, Science, Big
... overwhelmingly more probable that we should be observing a much different universe then we in fact observe. If our universe were but one member of a collection of randomly ordered worlds, then it is vastly more probable that we should be observing a much much smaller universe (Penrose, Road to Reali ...
... overwhelmingly more probable that we should be observing a much different universe then we in fact observe. If our universe were but one member of a collection of randomly ordered worlds, then it is vastly more probable that we should be observing a much much smaller universe (Penrose, Road to Reali ...
Astronomy (stars, galaxies and the Universe)
... When the contracting gas and dust from a nebula become so dense and hot that nuclear fusion begins, the protostar begins to shine When a star begins to run out of fuel, its core shrinks and its outer portion expands The evolutionary path of a star depends on its mass ...
... When the contracting gas and dust from a nebula become so dense and hot that nuclear fusion begins, the protostar begins to shine When a star begins to run out of fuel, its core shrinks and its outer portion expands The evolutionary path of a star depends on its mass ...
Cosmology and Particle Physics
... called a Doppler shift, it is notspace itself is expanding. There is 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 t ...
... called a Doppler shift, it is notspace itself is expanding. There is 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 t ...
Black Hole
... Appearance of a bright star in our Milky Way galaxy. It took almost eight months to fade away from the sky. It sparkled like a star in the sky. Today we know it was a `Supernova'. ...
... Appearance of a bright star in our Milky Way galaxy. It took almost eight months to fade away from the sky. It sparkled like a star in the sky. Today we know it was a `Supernova'. ...
Archaeology of the Universe
... measurements, confirmed independently by various observatories: this is why they have been accepted by the scientific community as physical reality. In order to observe very faraway distances, we must study what is around us in the universe. First of all, there are the stars, which are relatively cl ...
... measurements, confirmed independently by various observatories: this is why they have been accepted by the scientific community as physical reality. In order to observe very faraway distances, we must study what is around us in the universe. First of all, there are the stars, which are relatively cl ...
Chapter 21: Energy and Matter in the Universe
... Energy going into the gravitational force would have taken energy away from the photons, presumably distributing this energy among gravitons, the carrier particles for the gravitational force. The less energetic photons would have had a lower average temperature, and the cooling process of the Unive ...
... Energy going into the gravitational force would have taken energy away from the photons, presumably distributing this energy among gravitons, the carrier particles for the gravitational force. The less energetic photons would have had a lower average temperature, and the cooling process of the Unive ...
Lecture 1, PPT version
... In-class “Minute Papers” • Last 5 minutes of class (12:15pm to 12:20pm) write a few sentences on one of the following: something you found particularly interesting in the day’s lecture, something you found particularly confusing in the day’s lecture, questions you have about topics that were covere ...
... In-class “Minute Papers” • Last 5 minutes of class (12:15pm to 12:20pm) write a few sentences on one of the following: something you found particularly interesting in the day’s lecture, something you found particularly confusing in the day’s lecture, questions you have about topics that were covere ...
Chapter 30 Review
... the Milky Way by using gamma waves because they penetrate the interstellar gas and dust without being scattered or absorbed. ...
... the Milky Way by using gamma waves because they penetrate the interstellar gas and dust without being scattered or absorbed. ...
Chapter 8, Lesson 5, pdf
... • Classify galaxies according to their properties. • Explain the big bang and the way in which Earth and its atmosphere were formed. ...
... • Classify galaxies according to their properties. • Explain the big bang and the way in which Earth and its atmosphere were formed. ...
Universe
![](https://commons.wikimedia.org/wiki/Special:FilePath/Ilc_9yr_moll4096.png?width=300)
The Universe is all of time and space and its contents. The Universe includes planets, stars, galaxies, the contents of intergalactic space, the smallest subatomic particles, and all matter and energy. The observable universe is about 28 billion parsecs (91 billion light-years) in diameter at the present time. The size of the whole Universe is not known and may be infinite. Observations and the development of physical theories have led to inferences about the composition and evolution of the Universe.Throughout recorded history, cosmologies and cosmogonies, including scientific models, have been proposed to explain observations of the Universe. The earliest quantitative geocentric models were developed by ancient Greek philosophers and Indian philosophers. Over the centuries, more precise astronomical observations led to Nicolaus Copernicus's heliocentric model of the Solar System and Johannes Kepler's improvement on that model with elliptical orbits, which was eventually explained by Isaac Newton's theory of gravity. Further observational improvements led to the realization that the Solar System is located in a galaxy composed of billions of stars, the Milky Way. It was subsequently discovered that our galaxy is just one of many. On the largest scales, it is assumed that the distribution of galaxies is uniform and the same in all directions, meaning that the Universe has neither an edge nor a center. Observations of the distribution of these galaxies and their spectral lines have led to many of the theories of modern physical cosmology. The discovery in the early 20th century that galaxies are systematically redshifted suggested that the Universe is expanding, and the discovery of the cosmic microwave background radiation suggested that the Universe had a beginning. Finally, observations in the late 1990s indicated the rate of the expansion of the Universe is increasing indicating that the majority of energy is most likely in an unknown form called dark energy. The majority of mass in the universe also appears to exist in an unknown form, called dark matter.The Big Bang theory is the prevailing cosmological model describing the development of the Universe. Space and time were created in the Big Bang, and these were imbued with a fixed amount of energy and matter; as space expands, the density of that matter and energy decreases. After the initial expansion, the Universe cooled sufficiently to allow the formation first of subatomic particles and later of simple atoms. Giant clouds of these primordial elements later coalesced through gravity to form stars. Assuming that the prevailing model is correct, the age of the Universe is measured to be 7001137990000000000♠13.799±0.021 billion years.There are many competing hypotheses about the ultimate fate of the Universe. Physicists and philosophers remain unsure about what, if anything, preceded the Big Bang. Many refuse to speculate, doubting that any information from any such prior state could ever be accessible. There are various multiverse hypotheses, in which some physicists have suggested that the Universe might be one among many universes that likewise exist.