Geo-centric astronomy from Pythagoras to Ptolemy File
... by Plato’s insistence upon a stationary earth and circular motion of stars and planets. Some of the important early astronomical speculations include the following: “Central fire” or “the hearth of Zeus”: Pythagoras ‘s student, by the name of Philolaus (470–c. 385 BCE) proposed that the daily revolu ...
... by Plato’s insistence upon a stationary earth and circular motion of stars and planets. Some of the important early astronomical speculations include the following: “Central fire” or “the hearth of Zeus”: Pythagoras ‘s student, by the name of Philolaus (470–c. 385 BCE) proposed that the daily revolu ...
MySci Unit 23
... Identify that planets look like stars and appear to move across the sky among the stars B. The Earth has a composition and location suitable to sustain life Describe physical features of the planet Earth that allows life to exist (e.g., air, water, temperature) and compare these to the physical feat ...
... Identify that planets look like stars and appear to move across the sky among the stars B. The Earth has a composition and location suitable to sustain life Describe physical features of the planet Earth that allows life to exist (e.g., air, water, temperature) and compare these to the physical feat ...
Brown et al. 2008 Studying Resolved Stellar
... mix of chemical abundances and ages, an accurate star formation history can be reconstructed from photometry reaching well below the turnoff of the stellar main sequence. For decades, such stars could be resolved only within nearby star clusters of our own Galaxy, but in the 1990s, this technique wa ...
... mix of chemical abundances and ages, an accurate star formation history can be reconstructed from photometry reaching well below the turnoff of the stellar main sequence. For decades, such stars could be resolved only within nearby star clusters of our own Galaxy, but in the 1990s, this technique wa ...
Fulltext PDF - Indian Academy of Sciences
... a simple dynamical model. This model is introduced and described in this article. It can serve as an excellent exercise in an undergraduate physics course, illustrating both mechanical principles and basic astronomy. Introduction Today, a great deal is known about the collection of stars of which ou ...
... a simple dynamical model. This model is introduced and described in this article. It can serve as an excellent exercise in an undergraduate physics course, illustrating both mechanical principles and basic astronomy. Introduction Today, a great deal is known about the collection of stars of which ou ...
PHYS3380_102815_bw - The University of Texas at Dallas
... XZ Tauri - young system with two stars orbiting each other - separated by about 6 billion kilometers (about the distance from the Sun to Pluto) - shows bubble of hot, glowing gas extending nearly 96 billion kilometers from this young star system. - appears much broader than the narrow jets seen in o ...
... XZ Tauri - young system with two stars orbiting each other - separated by about 6 billion kilometers (about the distance from the Sun to Pluto) - shows bubble of hot, glowing gas extending nearly 96 billion kilometers from this young star system. - appears much broader than the narrow jets seen in o ...
SGHS Faulkes ASISTM Star Cluster Photometry
... The colour of a star is due to the temperature of its outer atmosphere. Relatively cool stars are orange or red and hot stars are white or blue. The temperature of a star’s outer layers is determined by how much energy a star is giving out and how far the star’s outer layers are from the centre of t ...
... The colour of a star is due to the temperature of its outer atmosphere. Relatively cool stars are orange or red and hot stars are white or blue. The temperature of a star’s outer layers is determined by how much energy a star is giving out and how far the star’s outer layers are from the centre of t ...
Notes (PowerPoint)
... • Normally counter-clockwise from above north pole • All planets exhibited this sometimes • Plato’s theory had extra spheres and features to handle retrograde motion ...
... • Normally counter-clockwise from above north pole • All planets exhibited this sometimes • Plato’s theory had extra spheres and features to handle retrograde motion ...
Chapter 1 - Pearson Education
... Some galaxies are fairly isolated, but many others congregate in groups. Our Milky Way, for example, is one of the two largest galaxies among about 40 galaxies in the Local Group. Groups of galaxies with more than a few dozen members are often called galaxy clusters. Basic Astronomical Objects, Unit ...
... Some galaxies are fairly isolated, but many others congregate in groups. Our Milky Way, for example, is one of the two largest galaxies among about 40 galaxies in the Local Group. Groups of galaxies with more than a few dozen members are often called galaxy clusters. Basic Astronomical Objects, Unit ...
Preparing astronomical observations and observing with OHP facilities
... project, the observer will choose a list of precise and similar targets. For a pedagogical project, on the other hand, it is more interesting to observe a wide sample of astronomical objects. We sum up in the following part what kind of astronomical objects can be seen with an optical telescope such ...
... project, the observer will choose a list of precise and similar targets. For a pedagogical project, on the other hand, it is more interesting to observe a wide sample of astronomical objects. We sum up in the following part what kind of astronomical objects can be seen with an optical telescope such ...
Evolution of Warm Debris Around Sun-like Stars: Clues to Terrestrial
... Our main result is that 10-100 Myr appears to be the preferred epoch for the generation of 24 micron debris excess around sun-like stars. Studies of extinct radio-active nuclides suggest that the Earth-Moon system was formed about 30 Myr after the formation of the Sun. This is also consistent with n ...
... Our main result is that 10-100 Myr appears to be the preferred epoch for the generation of 24 micron debris excess around sun-like stars. Studies of extinct radio-active nuclides suggest that the Earth-Moon system was formed about 30 Myr after the formation of the Sun. This is also consistent with n ...
Climbing the Distance Ladder
... 1) Distances within the Solar System can be measured using radar. 2) Distances of nearby stars can be measured using parallax. 3) Greater distances can be measured using standard candles. ...
... 1) Distances within the Solar System can be measured using radar. 2) Distances of nearby stars can be measured using parallax. 3) Greater distances can be measured using standard candles. ...
THE PHYSICAL CHARACTERIZATION OF THE STARS 1
... gravitational collapse of giant and cold clouds of molecular gas, take long episodes of production of energy through thermonuclear reactions in their interior with a length that depends on the mass, and die as highly compact objects. The life of an isolated star is mainly driven by their initial mas ...
... gravitational collapse of giant and cold clouds of molecular gas, take long episodes of production of energy through thermonuclear reactions in their interior with a length that depends on the mass, and die as highly compact objects. The life of an isolated star is mainly driven by their initial mas ...
AST1100 Lecture Notes
... most massive stars. We will later discuss theoretical arguments explaining why there is a lower and an upper limit of star masses. We will now start to look at the evolution of stars, from birth to death. Stars start out as huge clouds of gas contracting due to their own gravity. Thus a star starts ...
... most massive stars. We will later discuss theoretical arguments explaining why there is a lower and an upper limit of star masses. We will now start to look at the evolution of stars, from birth to death. Stars start out as huge clouds of gas contracting due to their own gravity. Thus a star starts ...
Celestial Coordinates Celestial Sphere: The celestial sphere is an
... centered on the observer. This concept is useful for determining positions in the sky. Zenith: This is the point in the sky directly above the observer. Celestial Poles: As the Earth rotates, the sky appears to rotate around two points in the sky, one aligned with the geographic North Pole, and the ...
... centered on the observer. This concept is useful for determining positions in the sky. Zenith: This is the point in the sky directly above the observer. Celestial Poles: As the Earth rotates, the sky appears to rotate around two points in the sky, one aligned with the geographic North Pole, and the ...
Astronomy 328 Midterm Exam - Department of Physics and Astronomy
... worked out problems or concepts. You must turn in your formula sheet with the exam. Calculators are permitted. Good luck. ...
... worked out problems or concepts. You must turn in your formula sheet with the exam. Calculators are permitted. Good luck. ...
Starburst Galaxies Encyclopedia of Astronomy & Astrophysics eaa.iop.org T Heckman
... estimate t is to calculate the gas-depletion time: the mass of interstellar gas in the starburst divided by the present rate of star formation. This is then a rough estimate of how much longer the starburst can be sustained before running out of gas. Gas-depletion times in starbursts are usually of ...
... estimate t is to calculate the gas-depletion time: the mass of interstellar gas in the starburst divided by the present rate of star formation. This is then a rough estimate of how much longer the starburst can be sustained before running out of gas. Gas-depletion times in starbursts are usually of ...
Stars 3
... Nebula. These include wisp-like structures that move outward away from the pulsar at half the speed of light, as well as a mysterious “halo” which remains stationary, but grows brighter then fainter over time. Also seen are the effects of two polar jets that move out along the rotation axis of the p ...
... Nebula. These include wisp-like structures that move outward away from the pulsar at half the speed of light, as well as a mysterious “halo” which remains stationary, but grows brighter then fainter over time. Also seen are the effects of two polar jets that move out along the rotation axis of the p ...
– 1 – 1. Cosmochronology
... clusters, they are thus quite uncertain due to systematic modeling uncertainties, not to random observational errors. Another feature of stellar evolution which is somewhat more promising is the population of white dwarfs in clusters. These have no or very little nuclear activity, their luminosity i ...
... clusters, they are thus quite uncertain due to systematic modeling uncertainties, not to random observational errors. Another feature of stellar evolution which is somewhat more promising is the population of white dwarfs in clusters. These have no or very little nuclear activity, their luminosity i ...
Presentation - Relativity Group
... millions to billions of years? • By taking observations of many stars, we can study stars in many phases of life, just as we might study how humans age by observing the humans living in a village at one time. • What two basic physical properties do astronomers use to classify stars? • Stars are clas ...
... millions to billions of years? • By taking observations of many stars, we can study stars in many phases of life, just as we might study how humans age by observing the humans living in a village at one time. • What two basic physical properties do astronomers use to classify stars? • Stars are clas ...
THE MONTHLY SKY GUIDE, SIXTH EDITION
... termed a shooting star. Do not misidentify shooting stars with satellites or high-flying aeroplanes, which look like moving stars but drift at a more leisurely pace. Despite their name, shooting stars are nothing to do with stars at all. They are particles of dust shed by comets and are usually no b ...
... termed a shooting star. Do not misidentify shooting stars with satellites or high-flying aeroplanes, which look like moving stars but drift at a more leisurely pace. Despite their name, shooting stars are nothing to do with stars at all. They are particles of dust shed by comets and are usually no b ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.