ISP 205: Visions of the Universe
... Suppose you tried to count the more than 100 billion stars in our galaxy, at a rate of one per second… How long would it take you? ...
... Suppose you tried to count the more than 100 billion stars in our galaxy, at a rate of one per second… How long would it take you? ...
Objectives: 1.
... All Observers see the same Hubble expansion • Since the universe is homogenous and isotropic (cosmological principle), an observer at any point in the universe would also see galaxies moving away from them. • Big Bang Theory (explains why): ...
... All Observers see the same Hubble expansion • Since the universe is homogenous and isotropic (cosmological principle), an observer at any point in the universe would also see galaxies moving away from them. • Big Bang Theory (explains why): ...
Expansion of the Universe
... 1. Scattering of blue and green light - i.e. why the sky appears blue, and why some sunrises or sunsets may appear red. Dust, smoke from forest fires, or other intervening material between the source and the observer can scatter (remove) the higher frequency colors (blue, green, yellow, and orange) ...
... 1. Scattering of blue and green light - i.e. why the sky appears blue, and why some sunrises or sunsets may appear red. Dust, smoke from forest fires, or other intervening material between the source and the observer can scatter (remove) the higher frequency colors (blue, green, yellow, and orange) ...
Lecture 22 - Center for Astrophysics and Space Astronomy CASA
... • Whether Universe is open or closed depends on the average DENSITY of matter. • Above 10-29 g/cc the universe is closed • Below 10-29 g/cc the universe is open • We are very close to that density • Coincidence? rcrit is about 1 atom per liter ...
... • Whether Universe is open or closed depends on the average DENSITY of matter. • Above 10-29 g/cc the universe is closed • Below 10-29 g/cc the universe is open • We are very close to that density • Coincidence? rcrit is about 1 atom per liter ...
Not a limitation
... (singularity) that “blew up” and is still moving outwards today • Not really an explosion, so much as a very rapid expansion…like blowing up a balloon • About 13.7 billion years ago • Microwave radiation detected in the 1960’s supports this theory. It’s left over energy from the Big Bang ...
... (singularity) that “blew up” and is still moving outwards today • Not really an explosion, so much as a very rapid expansion…like blowing up a balloon • About 13.7 billion years ago • Microwave radiation detected in the 1960’s supports this theory. It’s left over energy from the Big Bang ...
Quiz Maker - Geneva 304
... 1. What was the universe like for ancient/medieval astronomers? 2. How did Astronomy relate to religious beliefs? 3. Why has the understandings and discoveries in the field of Astronomy increased so much over the last 30 years? Our Modern Perspective of the Universe 4. Since the Copernican revolutio ...
... 1. What was the universe like for ancient/medieval astronomers? 2. How did Astronomy relate to religious beliefs? 3. Why has the understandings and discoveries in the field of Astronomy increased so much over the last 30 years? Our Modern Perspective of the Universe 4. Since the Copernican revolutio ...
presentation02 - School of Physical Sciences
... about 3 light years or 20 trillion miles. If stars were 10 times closer (~2 trillion miles), a nearby star could pull the earth into an eccentric orbit and kill life here. If the stars were much farther apart, then there would not be enough heavy elements to make life. Heavy elements (like carbon an ...
... about 3 light years or 20 trillion miles. If stars were 10 times closer (~2 trillion miles), a nearby star could pull the earth into an eccentric orbit and kill life here. If the stars were much farther apart, then there would not be enough heavy elements to make life. Heavy elements (like carbon an ...
TheExpansionoftheUniverse
... As technology has improved we have able to more accurately calculate the expansion of the universe. As technology advances people will be able even more accurately find the distance of objects which will define more clearly Hubble’s constant. However this is also a problem as Hubble constant, will c ...
... As technology has improved we have able to more accurately calculate the expansion of the universe. As technology advances people will be able even more accurately find the distance of objects which will define more clearly Hubble’s constant. However this is also a problem as Hubble constant, will c ...
expanding universe
... A human being is part of the whole called by us universe, a part limited in time and space. We experience ourselves, our thoughts and feelings as something separate from the rest. A kind of optical delusion of consciousness. This delusion is a kind of prison for us, restricting us to our personal d ...
... A human being is part of the whole called by us universe, a part limited in time and space. We experience ourselves, our thoughts and feelings as something separate from the rest. A kind of optical delusion of consciousness. This delusion is a kind of prison for us, restricting us to our personal d ...
The Big Bang
... exploded out of the big bang did not distribute itself evenly throughout the universe? What evidence supports this hypothesis? According to this theory, how old is the universe? ...
... exploded out of the big bang did not distribute itself evenly throughout the universe? What evidence supports this hypothesis? According to this theory, how old is the universe? ...
Big Bang
... 1) Dark night sky → Finite age for universe. 2) Redshift proportional to distance → Homogeneous & isotropic expansion. 3) Cosmic Microwave Background → Universe was hot & dense enough to be opaque. ...
... 1) Dark night sky → Finite age for universe. 2) Redshift proportional to distance → Homogeneous & isotropic expansion. 3) Cosmic Microwave Background → Universe was hot & dense enough to be opaque. ...
Celestial Objects
... Evidence for the Big Bang a) red shiftshift- shift toward longer red wavelengths of energy showing that an object is moving AWAY from Earth 1) the farther away the galaxy, the greater the red shift 2) almost all galaxies show a red shiftshiftproof that the universe is expanding (Edwin Hubble was th ...
... Evidence for the Big Bang a) red shiftshift- shift toward longer red wavelengths of energy showing that an object is moving AWAY from Earth 1) the farther away the galaxy, the greater the red shift 2) almost all galaxies show a red shiftshiftproof that the universe is expanding (Edwin Hubble was th ...
Our Universe is big, beautiful… and mostly
... just one of billions of stars that make up our galaxy, which is called the Milky Way. When you think about how the Milky Way is just one galaxy in a group of about 40 nearby galaxies, the Universe is starting to seem like a big place! This new picture shows a different group of galaxies that is much ...
... just one of billions of stars that make up our galaxy, which is called the Milky Way. When you think about how the Milky Way is just one galaxy in a group of about 40 nearby galaxies, the Universe is starting to seem like a big place! This new picture shows a different group of galaxies that is much ...
ASTRONOMY WEBQUEST…… EXPLORE THE UNIVERSE
... http://library.thinkquest.org/26220/stars/formation.html What is a nebula (click on protostars)? ...
... http://library.thinkquest.org/26220/stars/formation.html What is a nebula (click on protostars)? ...
CosmologyL2
... How do we know that the expansion of the universe is speeding up? by comparing its expansion today with how fast it was expanding in the distant past: By observing the motions of galaxies at different distances, astronomers can tell how fast the universe was expanding at different times in the past ...
... How do we know that the expansion of the universe is speeding up? by comparing its expansion today with how fast it was expanding in the distant past: By observing the motions of galaxies at different distances, astronomers can tell how fast the universe was expanding at different times in the past ...
Before people could understand the history of the universe, they had
... • The Catholic Church later forced Galileo to recant his ideas and live out his life under house arrest, but his discoveries had already changed the face of astronomy ...
... • The Catholic Church later forced Galileo to recant his ideas and live out his life under house arrest, but his discoveries had already changed the face of astronomy ...
Shape of the universe
The shape of the universe is the local and global geometry of the Universe, in terms of both curvature and topology (though, strictly speaking, the concept goes beyond both). The shape of the universe is related to general relativity which describes how spacetime is curved and bent by mass and energy.There is a distinction between the observable universe and the global universe. The observable universe consists of the part of the universe that can, in principle, be observed due to the finite speed of light and the age of the universe. The observable universe is understood as a sphere around the Earth extending 93 billion light years (8.8 *1026 meters) and would be similar at any observing point (assuming the universe is indeed isotropic, as it appears to be from our vantage point).According to the book Our Mathematical Universe, the shape of the global universe can be explained with three categories: Finite or infinite Flat (no curvature), open (negative curvature) or closed (positive curvature) Connectivity, how the universe is put together, i.e., simply connected space or multiply connected.There are certain logical connections among these properties. For example, a universe with positive curvature is necessarily finite. Although it is usually assumed in the literature that a flat or negatively curved universe is infinite, this need not be the case if the topology is not the trivial one.The exact shape is still a matter of debate in physical cosmology, but experimental data from various, independent sources (WMAP, BOOMERanG and Planck for example) confirm that the observable universe is flat with only a 0.4% margin of error. Theorists have been trying to construct a formal mathematical model of the shape of the universe. In formal terms, this is a 3-manifold model corresponding to the spatial section (in comoving coordinates) of the 4-dimensional space-time of the universe. The model most theorists currently use is the so-called Friedmann–Lemaître–Robertson–Walker (FLRW) model. Arguments have been put forward that the observational data best fit with the conclusion that the shape of the global universe is infinite and flat, but the data are also consistent with other possible shapes, such as the so-called Poincaré dodecahedral space and the Picard horn.