The Milky Way Galaxy is Heading for a Major Cosmic Collision
... Similar to Milky Way (shape, size, mass) One of few galaxies that can be seen with naked eye First described by astronomers >1000 years ago ...
... Similar to Milky Way (shape, size, mass) One of few galaxies that can be seen with naked eye First described by astronomers >1000 years ago ...
pkt 14 Astrophysics
... A supernova causes a burst of radiation that may briefly outshine its entire host galaxy before fading from view over several weeks or months. During this short interval, a supernova can radiate as much energy as the Sun would emit over 10 billion years. ...
... A supernova causes a burst of radiation that may briefly outshine its entire host galaxy before fading from view over several weeks or months. During this short interval, a supernova can radiate as much energy as the Sun would emit over 10 billion years. ...
Galaxy Formation and Evolution
... Redshift: Because of the expansion of the Universe, an object that is further away will have a larger receding velocity, and thus a larger redshift. Since the light from high-redshift galaxies was emitted when the Universe was younger, we can study galaxy evolution by observing the galaxy population ...
... Redshift: Because of the expansion of the Universe, an object that is further away will have a larger receding velocity, and thus a larger redshift. Since the light from high-redshift galaxies was emitted when the Universe was younger, we can study galaxy evolution by observing the galaxy population ...
Age Estimates of Globular Clusters in the Milky Way
... stellar evolution were performed, as well as refined estimates of the parameters that govern stellar evolution, the lower limit on globular cluster ages progressively decreased, so that a wide range of cosmological models produced Hubble ages consistent with this lower limit (4 –7). In the interim, ...
... stellar evolution were performed, as well as refined estimates of the parameters that govern stellar evolution, the lower limit on globular cluster ages progressively decreased, so that a wide range of cosmological models produced Hubble ages consistent with this lower limit (4 –7). In the interim, ...
Galaxies
... arms are wound, with “a” being most tightly wound. The Andromeda Galaxy is an Sb. • Elliptical galaxies are denoted by “E”, with a number from 0-7 indicating how circular it appears. An example of this would be M87, which is an E0 galaxy. • Irregulars, such as the Small Magellanic Cloud, are denoted ...
... arms are wound, with “a” being most tightly wound. The Andromeda Galaxy is an Sb. • Elliptical galaxies are denoted by “E”, with a number from 0-7 indicating how circular it appears. An example of this would be M87, which is an E0 galaxy. • Irregulars, such as the Small Magellanic Cloud, are denoted ...
Question paper - Unit A183/02 - Module P7 - Higher tier
... Edwin Hubble first measured the distance to the Andromeda galaxy using Cepheid variables. He measured the distance as about 1 million light years. Modern measurements using Cepheid variables, give a distance of 2.5 million light years. Telescopes in space have made it possible to make better measure ...
... Edwin Hubble first measured the distance to the Andromeda galaxy using Cepheid variables. He measured the distance as about 1 million light years. Modern measurements using Cepheid variables, give a distance of 2.5 million light years. Telescopes in space have made it possible to make better measure ...
Active Galaxies
... attributed to stars. The energy is believed to originate from accretion onto a supermassive blackhole. Active galaxies tend to have higher overall luminosities and very different spectra than “normal” galaxies. “non-stellar” radiation ...
... attributed to stars. The energy is believed to originate from accretion onto a supermassive blackhole. Active galaxies tend to have higher overall luminosities and very different spectra than “normal” galaxies. “non-stellar” radiation ...
Hubble - 15 Years of Discovery
... you have a little patience). If you look at the constellation Cepheus over several days, you will see that one of the bright stars changes in brightness every day – that star is d-Cephei. When we look at the night sky, some stars are brighter than others. Some of the bright stars are really rather s ...
... you have a little patience). If you look at the constellation Cepheus over several days, you will see that one of the bright stars changes in brightness every day – that star is d-Cephei. When we look at the night sky, some stars are brighter than others. Some of the bright stars are really rather s ...
Study of the X-ray Source Population and the Dark Matter
... would indicate that these galaxies are able to retain their compact objects, which are believed to obtain high kick velocities at their birth in asymmetric supernova explosions. Therefore, the search for and the study of X-ray sources in dSph galaxies in the Local Group will enable us to constrain t ...
... would indicate that these galaxies are able to retain their compact objects, which are believed to obtain high kick velocities at their birth in asymmetric supernova explosions. Therefore, the search for and the study of X-ray sources in dSph galaxies in the Local Group will enable us to constrain t ...
Galaxy Powerpoint Notes
... Inside of galaxies : Inside of galaxies Ever wondered what was inside a galaxy? Well look no farther, because you’re in one! Unfortunately, galaxies are massive, and we can’t see as much as we wish, and that is why with the assistance of telescopes, astronomers have been able to identify certain thi ...
... Inside of galaxies : Inside of galaxies Ever wondered what was inside a galaxy? Well look no farther, because you’re in one! Unfortunately, galaxies are massive, and we can’t see as much as we wish, and that is why with the assistance of telescopes, astronomers have been able to identify certain thi ...
Galaxies - cloudfront.net
... billions of stars. Galaxies are divided into three types according to shape: spiral, elliptical, and irregular galaxies. • Spiral galaxies spin and appear as a rotating disk of stars and dust, with a bulge in the middle. Several spiral arms reach outward from the central bulge like the arms of a pin ...
... billions of stars. Galaxies are divided into three types according to shape: spiral, elliptical, and irregular galaxies. • Spiral galaxies spin and appear as a rotating disk of stars and dust, with a bulge in the middle. Several spiral arms reach outward from the central bulge like the arms of a pin ...
First Light for May, 2001 - South Bay Astronomical Society
... motion towards or away from Earth. Thus, the Wobble method provides for a wider range of planetary systems. If both methods can be used on a exo-system, the size and mass of the planets can be determined. Given these two methods, it’s not entirely surprising that many of the earliest exo-planets dis ...
... motion towards or away from Earth. Thus, the Wobble method provides for a wider range of planetary systems. If both methods can be used on a exo-system, the size and mass of the planets can be determined. Given these two methods, it’s not entirely surprising that many of the earliest exo-planets dis ...
Quasars- The Brightest Black Holes
... In 1962 an opportunity arose for a much clearer determination of the position of one of these powerful but as yet unidentified sources, 3C273, when it would be eclipsed by the Moon three times - in May, August and October. The advantage of such an event is that we always know the position of the Mo ...
... In 1962 an opportunity arose for a much clearer determination of the position of one of these powerful but as yet unidentified sources, 3C273, when it would be eclipsed by the Moon three times - in May, August and October. The advantage of such an event is that we always know the position of the Mo ...
Dark Matter— More Than Meets The Eye
... to have a mass of 1000 grams. Ah, there must be more to this situation than meets the eye. 500 mL ...
... to have a mass of 1000 grams. Ah, there must be more to this situation than meets the eye. 500 mL ...
Absolute magnitude of type Ia supernovae
... Supernovae are violent phenomena in which runaway of thermonuclear fusion causes whole star’s explosion. In spite of calling a supernova as “a new star”, this phenomenon occurs at the last stage of a star’s evolution. Since its brightness temporarily reach to a few hundreds million times of our sun’ ...
... Supernovae are violent phenomena in which runaway of thermonuclear fusion causes whole star’s explosion. In spite of calling a supernova as “a new star”, this phenomenon occurs at the last stage of a star’s evolution. Since its brightness temporarily reach to a few hundreds million times of our sun’ ...
Atoms, Einstein, Universe
... stars. Hubble built on Leavitt’s discovery to demonstrate that there are galaxies far beyond our own Milky Way. Then, Hubble used redshifts, as well as distances derived from Leavitt’s technique, to discover that the universe is expanding. We will learn the meaning of this expansion, what is expandi ...
... stars. Hubble built on Leavitt’s discovery to demonstrate that there are galaxies far beyond our own Milky Way. Then, Hubble used redshifts, as well as distances derived from Leavitt’s technique, to discover that the universe is expanding. We will learn the meaning of this expansion, what is expandi ...
Measuring the masses of clusters
... are not obviously associated with galaxies. May have been heated as smaller galaxies (or clumps of galaxies) fell into the cluster –! In densest regions, gas may cool and sink toward the cluster center as a “cooling flow” –! Unlikely that all of it has escaped from galaxies, some must be around from ...
... are not obviously associated with galaxies. May have been heated as smaller galaxies (or clumps of galaxies) fell into the cluster –! In densest regions, gas may cool and sink toward the cluster center as a “cooling flow” –! Unlikely that all of it has escaped from galaxies, some must be around from ...
Starbursts – from 30 Doradus to Lyman
... to last more than a few years. A robotic repair mission is currently under design, but many are sceptical that this will be realized rapidly enough to avert disaster for our community. ...
... to last more than a few years. A robotic repair mission is currently under design, but many are sceptical that this will be realized rapidly enough to avert disaster for our community. ...
Searching for Dwarf Galaxies and Population III Star
... III. In addition, if the He II emission is spatially extended, the almost certainly emission arises from star formation instead of an active galactic nucleus (AGN). ...
... III. In addition, if the He II emission is spatially extended, the almost certainly emission arises from star formation instead of an active galactic nucleus (AGN). ...
Chapter 3 Cosmology 3.1 The Doppler effect
... discovered very distant supernovae much further away than expected. To reach such distances, the supernovae must have been accelerating. The astronomers concluded that the expansion of the Universe is accelerating and has been for about the past 5000 million years. Before this discovery, most astron ...
... discovered very distant supernovae much further away than expected. To reach such distances, the supernovae must have been accelerating. The astronomers concluded that the expansion of the Universe is accelerating and has been for about the past 5000 million years. Before this discovery, most astron ...
1. setting the scene 2. the cosmic dark ages and the first stars
... from gamma rays to radio frequencies, it has become possible to piece together the past history of the Universe and make an educated guess as to its future destiny. This ‘standard model’ of cosmology is illustrated in Figure 1. Our Universe began 13.7 billion years ago, in an event whose popular nam ...
... from gamma rays to radio frequencies, it has become possible to piece together the past history of the Universe and make an educated guess as to its future destiny. This ‘standard model’ of cosmology is illustrated in Figure 1. Our Universe began 13.7 billion years ago, in an event whose popular nam ...
Chapter 20. Galaxies
... star light from the galaxy. It is further characterized by sometimes extreme variability that reflects variations in the accretion rate. The time scale for the variations can be as short as minutes, hours, days or months. When variable galaxies on these time scales were first discovered it was hard ...
... star light from the galaxy. It is further characterized by sometimes extreme variability that reflects variations in the accretion rate. The time scale for the variations can be as short as minutes, hours, days or months. When variable galaxies on these time scales were first discovered it was hard ...
The Cosmic Microwave Background
... density Ωbh2 make the first acoustic peak much larger than the second. The more baryons the more the second peak is relatively suppressed. Baryons constitute about 5% of the critical density today, in agreement with the number derived from studies of light element synthesis in the infant universe. A ...
... density Ωbh2 make the first acoustic peak much larger than the second. The more baryons the more the second peak is relatively suppressed. Baryons constitute about 5% of the critical density today, in agreement with the number derived from studies of light element synthesis in the infant universe. A ...
It`s cosmic! - NSW Department of Education
... Now here is something to make you wonder! When you look at a star, you are seeing light that has travelled all the way from the star to your eyes. Light travels quickly but stars are so far away that it takes a long time for the light to arrive. For example, Rigel is 900 ly away. When you look at Ri ...
... Now here is something to make you wonder! When you look at a star, you are seeing light that has travelled all the way from the star to your eyes. Light travels quickly but stars are so far away that it takes a long time for the light to arrive. For example, Rigel is 900 ly away. When you look at Ri ...
24.1 Hubble`s Galaxy Classification
... They can be used as “standard candles”—objects whose absolute magnitude is known, and which can therefore be used to determine distance using their apparent magnitude. This is no different from saying that if you see an RR Lyrae star, you know its absolute luminosity because all RR Lyrae stars have ...
... They can be used as “standard candles”—objects whose absolute magnitude is known, and which can therefore be used to determine distance using their apparent magnitude. This is no different from saying that if you see an RR Lyrae star, you know its absolute luminosity because all RR Lyrae stars have ...
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.