Point-like source searches with ANTARES
... • Moreover, gammas are also produced in this scenario: ...
... • Moreover, gammas are also produced in this scenario: ...
A n A n c i e n... How Astronomers Know the Vast Scale of Cosmic Time
... and its contents are there for all to see on any clear night. When astronomers talk about the universe, they mean everything that is accessible to our observations. The universe includes all that we can survey or experiment on, from the moon that orbits our own planet out to the most distant islands ...
... and its contents are there for all to see on any clear night. When astronomers talk about the universe, they mean everything that is accessible to our observations. The universe includes all that we can survey or experiment on, from the moon that orbits our own planet out to the most distant islands ...
Galaxy Evolution in the SDSS Low
... Redshift success rate (fraction of fibers with successful redshift) is much simpler: overall > 90% and a weak function of magnitude, photo-z, and color ...
... Redshift success rate (fraction of fibers with successful redshift) is much simpler: overall > 90% and a weak function of magnitude, photo-z, and color ...
HON 392 - Chapman University
... Aristotle (384-322 B.C.), On the Heavens 350 B.C. (selections) Ptolemy (100 A.D.-170 A.D.), Almagest circa 150 A.D. ( short selections; "the Almagest had become the standard textbook on astronomy which it was to remain for more than a thousand years... down to the sixteenth century. It was dominant ...
... Aristotle (384-322 B.C.), On the Heavens 350 B.C. (selections) Ptolemy (100 A.D.-170 A.D.), Almagest circa 150 A.D. ( short selections; "the Almagest had become the standard textbook on astronomy which it was to remain for more than a thousand years... down to the sixteenth century. It was dominant ...
Extension worksheet – Topic 6 - Cambridge Resources for the IB
... In the Newtonian model of the universe there is an infinite number of stars uniformly distributed in an infinite universe; any thin shell a distance d from an observer contains a number of stars proportional to d2; and since the apparent brightness varies ...
... In the Newtonian model of the universe there is an infinite number of stars uniformly distributed in an infinite universe; any thin shell a distance d from an observer contains a number of stars proportional to d2; and since the apparent brightness varies ...
Chapter 1 - Princeton University Press
... their velocities. He found that the further away a galaxy was, the faster it was moving away from us. The whole universe was expanding! This was astonishing. Isaac Newton had a static universe. Even Einstein, genius of curved spacetime, thought the universe must be static. The discovery that the uni ...
... their velocities. He found that the further away a galaxy was, the faster it was moving away from us. The whole universe was expanding! This was astonishing. Isaac Newton had a static universe. Even Einstein, genius of curved spacetime, thought the universe must be static. The discovery that the uni ...
transparencies
... What shapes the cosmos? – Old answer: the mass it contains, through gravity But we now know – There is much more mass than we’d expect from the stars we see, or from the amount of helium formed in the early universe • Dark matter – The velocity of distant galaxies shows there is some kind of energy ...
... What shapes the cosmos? – Old answer: the mass it contains, through gravity But we now know – There is much more mass than we’d expect from the stars we see, or from the amount of helium formed in the early universe • Dark matter – The velocity of distant galaxies shows there is some kind of energy ...
SpfFin - Academic Program Pages
... 24. Suppose it was discovered that Hubble's constant, H0, was smaller than previously thought. How would this affect our estimate of the age of the universe? It would have no effect on our estimate of the age of the universe. The age of the universe would be smaller. The age of the universe would be ...
... 24. Suppose it was discovered that Hubble's constant, H0, was smaller than previously thought. How would this affect our estimate of the age of the universe? It would have no effect on our estimate of the age of the universe. The age of the universe would be smaller. The age of the universe would be ...
Dark Matter NS Warsaw
... ▸ Large variations in the r-process enrichment of ultra-faint dwarf galaxies are expected — but no large variations are expected in the r-process enrichment of Globular Clusters (which are otherwise very similar). DES/LSST, GMT/TMT ...
... ▸ Large variations in the r-process enrichment of ultra-faint dwarf galaxies are expected — but no large variations are expected in the r-process enrichment of Globular Clusters (which are otherwise very similar). DES/LSST, GMT/TMT ...
How do we know what stars are
... Life Cycle of Stars Video https://www.youtube.com/watch?v=mzE7VZMT1z8 Age of a star is determined by the emission spectrum and the percentage of heavier elements. A star begins its life composed of _______________. Fusion creates ____________ in the core which increases as the star ages. When helium ...
... Life Cycle of Stars Video https://www.youtube.com/watch?v=mzE7VZMT1z8 Age of a star is determined by the emission spectrum and the percentage of heavier elements. A star begins its life composed of _______________. Fusion creates ____________ in the core which increases as the star ages. When helium ...
AST 207 Test 3 23 November 2009
... a. (1 pt.) At the present time, does the value of Hubble’s constant depend on the galaxy in which the observations are made? (2 pts.) Explain your reasoning. b. Simplicio erroneously believes that everything in the universe is expanding according to Hubble’s Law. At an earlier time, everything did o ...
... a. (1 pt.) At the present time, does the value of Hubble’s constant depend on the galaxy in which the observations are made? (2 pts.) Explain your reasoning. b. Simplicio erroneously believes that everything in the universe is expanding according to Hubble’s Law. At an earlier time, everything did o ...
Studying the Universe Studying the Universe
... Telescopes that use curved mirrors to gather and focus light are called reflecting telescopes. Light enters the telescope and is reflected from a large, curved mirror to a focal point above the mirror. A focal point is the point on the axis of a mirror or lens through which parallel light rays are f ...
... Telescopes that use curved mirrors to gather and focus light are called reflecting telescopes. Light enters the telescope and is reflected from a large, curved mirror to a focal point above the mirror. A focal point is the point on the axis of a mirror or lens through which parallel light rays are f ...
Sample pages 2 PDF
... supernova which occurred in 1054 and was observed by Chinese astronomers can still be seen in the Crab nebula, of which a picture appears in Fig. 2.4. The supernovae are significant because they produce the elements above iron in the periodic table and because they spread the products of nuclear bur ...
... supernova which occurred in 1054 and was observed by Chinese astronomers can still be seen in the Crab nebula, of which a picture appears in Fig. 2.4. The supernovae are significant because they produce the elements above iron in the periodic table and because they spread the products of nuclear bur ...
Long Ago and Far Away
... same time as our own Earth started forming in the Milky Way. If there were dinosaurs on that clone Earth living at the same time as the dinosaurs on our Earth, are we seeing that galaxy as it was in the age of the dinosaurs? Explain. Hint: dinosaurs became extinct on Earth about 65 million years ago ...
... same time as our own Earth started forming in the Milky Way. If there were dinosaurs on that clone Earth living at the same time as the dinosaurs on our Earth, are we seeing that galaxy as it was in the age of the dinosaurs? Explain. Hint: dinosaurs became extinct on Earth about 65 million years ago ...
PDF Version
... on the other side of the sun in its orbit. The differences in angle are extremely small; the nearest star to the sun is 4.37 light-years away and the change in angle because of parallax is about one and a half arcseconds (or 0.0004 degrees). Another unit that astronomers use to speak of distances to ...
... on the other side of the sun in its orbit. The differences in angle are extremely small; the nearest star to the sun is 4.37 light-years away and the change in angle because of parallax is about one and a half arcseconds (or 0.0004 degrees). Another unit that astronomers use to speak of distances to ...
Peer-reviewed Article PDF - e
... of non-observable DM remains to be attractive for researchers. To confirm this idea, Vera Rubin said: "If I could have my pick, I would like to learn that Newton's laws must be modified in order to correctly describe gravitational interactions at large distances. That's more appealing than a univers ...
... of non-observable DM remains to be attractive for researchers. To confirm this idea, Vera Rubin said: "If I could have my pick, I would like to learn that Newton's laws must be modified in order to correctly describe gravitational interactions at large distances. That's more appealing than a univers ...
GRADE 12A: Physics 7
... Point out that parallax measurements can only be used for relatively nearby stars (closer than about 100 pc). For more distant stars, less direct methods must be used. Explain how the HR diagram can be used in the following ways to estimate distances of stars. • Single star. Deduce the star’s temper ...
... Point out that parallax measurements can only be used for relatively nearby stars (closer than about 100 pc). For more distant stars, less direct methods must be used. Explain how the HR diagram can be used in the following ways to estimate distances of stars. • Single star. Deduce the star’s temper ...
PH607 – Galaxies
... 7.2 Clusters of Galaxies Clusters are systems a few Mpc across, typically containing at least 50-100 luminous galaxies within the central 1 Mpc Clusters are gravitationally bound Clusters are filled with hot X-ray gas Only ~20% of galaxies live in clusters, most live in groups or in the “fi ...
... 7.2 Clusters of Galaxies Clusters are systems a few Mpc across, typically containing at least 50-100 luminous galaxies within the central 1 Mpc Clusters are gravitationally bound Clusters are filled with hot X-ray gas Only ~20% of galaxies live in clusters, most live in groups or in the “fi ...
20 – N10/4/PHYSI/SP3/ENG/TZ0/XX Option E
... (f ) The surface temperature of both PA and PB is of the order of 104 K. The luminosity of PA is of the order of 10LS, where LS is the luminosity of the Sun. The diagram shows the grid of a Hertzsprung–Russell diagram. ...
... (f ) The surface temperature of both PA and PB is of the order of 104 K. The luminosity of PA is of the order of 10LS, where LS is the luminosity of the Sun. The diagram shows the grid of a Hertzsprung–Russell diagram. ...
After School Guide to Ology Astronomy
... Earth – Our dynamic home planet, Earth has conditions — like liquid water, an atmosphere, and moderate temperatures — that permit a great variety of life forms to exist. energy – Any attribute of matter or electromagnetic radiation that can be converted into motion. Energy makes things happen. It co ...
... Earth – Our dynamic home planet, Earth has conditions — like liquid water, an atmosphere, and moderate temperatures — that permit a great variety of life forms to exist. energy – Any attribute of matter or electromagnetic radiation that can be converted into motion. Energy makes things happen. It co ...
The Universe Section 1
... of 1.4 to 3 solar masses, the remnant can become a neutron star. – If the leftover core has a mass that is greater than three solar masses, it will collapse to form a black ...
... of 1.4 to 3 solar masses, the remnant can become a neutron star. – If the leftover core has a mass that is greater than three solar masses, it will collapse to form a black ...
Non-standard cosmology
A non-standard cosmology is any physical cosmological model of the universe that has been, or still is, proposed as an alternative to the Big Bang model of standard physical cosmology. In the history of cosmology, various scientists and researchers have disputed parts or all of the Big Bang due to a rejection or addition of fundamental assumptions needed to develop a theoretical model of the universe. From the 1940s to the 1960s, the astrophysical community was equally divided between supporters of the Big Bang theory and supporters of a rival steady state universe. It was not until advances in observational cosmology in the late 1960s that the Big Bang would eventually become the dominant theory, and today there are few active researchers who dispute it.The term non-standard is applied to any cosmological theory that does not conform to the scientific consensus, but is not used in describing alternative models where no consensus has been reached, and is also used to describe theories that accept a ""big bang"" occurred but differ as to the detailed physics of the origin and evolution of the universe. Because the term depends on the prevailing consensus, the meaning of the term changes over time. For example, hot dark matter would not have been considered non-standard in 1990, but would be in 2010. Conversely, a non-zero cosmological constant resulting in an accelerating universe would have been considered non-standard in 1990, but is part of the standard cosmology in 2010.