Planetary Taxonomy
... The IAU definition of planet can be solidified in three ways: 1) Replace “orbits the Sun” with “orbits a star” to make the definition applicable to exoplanets. exoplanets 2) Make the definition more rigorous by adopting an explicit criterion for dynamical dominance (such as a threshold on the direct ...
... The IAU definition of planet can be solidified in three ways: 1) Replace “orbits the Sun” with “orbits a star” to make the definition applicable to exoplanets. exoplanets 2) Make the definition more rigorous by adopting an explicit criterion for dynamical dominance (such as a threshold on the direct ...
Desert Skies - Tucson Amateur Astronomy Association
... retrograde motions of naked eye planets. We also had a presentation on carbon stars and double stars from JD Metzger and an observing list for September presented by Mary Turner. The efforts of those who stepped up to help us last month are greatly appreciated. We still have space in the October mee ...
... retrograde motions of naked eye planets. We also had a presentation on carbon stars and double stars from JD Metzger and an observing list for September presented by Mary Turner. The efforts of those who stepped up to help us last month are greatly appreciated. We still have space in the October mee ...
The Geographic Position of a Celestial Body
... slowly (tidal friction) and, moreover, fluctuates in an unpredictable manner due to random movements of matter within the earth's body (magma) and on the surface (water, air). Therefore, neither of both time scales is strictly uniform. Many astronomical applications, however, require a linear time s ...
... slowly (tidal friction) and, moreover, fluctuates in an unpredictable manner due to random movements of matter within the earth's body (magma) and on the surface (water, air). Therefore, neither of both time scales is strictly uniform. Many astronomical applications, however, require a linear time s ...
Universal Gravitation In the late 1600`s, Issac Newton noticed an
... IMPORTANT : The gravitational effects of a spherical body on a particle outside of it are the same as if all the mass were concentrated at the object’s CENTER. ...
... IMPORTANT : The gravitational effects of a spherical body on a particle outside of it are the same as if all the mass were concentrated at the object’s CENTER. ...
December 2015
... called the Snowflake Nebula. Rather like a Christmas Tree decoration. Most of the illuminated gas cloud nebulas seen in our skies are emission nebulae. The light emission arises from gases ionized by high energy photons emitted from stars that have often been formed within the nebula. These star for ...
... called the Snowflake Nebula. Rather like a Christmas Tree decoration. Most of the illuminated gas cloud nebulas seen in our skies are emission nebulae. The light emission arises from gases ionized by high energy photons emitted from stars that have often been formed within the nebula. These star for ...
The magnitude scale, parallax, the parsec, and Cepheid distances
... • To do this we need a property that does not vary with distance which is correlated with the absolute magnitude, e.g: – Cepheid variables (discovered by HenrieMa LeaviM (1912) • The Period-‐Luminosity r ...
... • To do this we need a property that does not vary with distance which is correlated with the absolute magnitude, e.g: – Cepheid variables (discovered by HenrieMa LeaviM (1912) • The Period-‐Luminosity r ...
Signatures of planets and of planet formation in debris disks Mark
... Several white dwarfs have near-IR emission from hot dust close to the ~1Rsun tidal destruction radius (von Hippel et al. 2007; Farihi et al. 2009), some also have CaII emission from circumstellar gas at same location (Gaensicke et al. 2009), while more have metal polluted atmospheres from accretion ...
... Several white dwarfs have near-IR emission from hot dust close to the ~1Rsun tidal destruction radius (von Hippel et al. 2007; Farihi et al. 2009), some also have CaII emission from circumstellar gas at same location (Gaensicke et al. 2009), while more have metal polluted atmospheres from accretion ...
Foreword - Peter Zamarovský
... fragmentary knowledge of the universe, and how clairvoyantly they were able to gaze into its mysterious structure. But they thought that the universe was unchanging over time because the fixed stars were really fixed, both as regards their mutual positions, and also their brightness and colour. It w ...
... fragmentary knowledge of the universe, and how clairvoyantly they were able to gaze into its mysterious structure. But they thought that the universe was unchanging over time because the fixed stars were really fixed, both as regards their mutual positions, and also their brightness and colour. It w ...
proposed path of the missing planet
... Can a plausible and convincing case be constructed for highly advanced civilization on Earth thousands of years earlier than that which is typically taught in formal education? Is it possible to demonstrate that knowledge commensurate with space travel might well have been possible back then? That l ...
... Can a plausible and convincing case be constructed for highly advanced civilization on Earth thousands of years earlier than that which is typically taught in formal education? Is it possible to demonstrate that knowledge commensurate with space travel might well have been possible back then? That l ...
Celebrating the centennial of a celestial yardstick
... had abundant volcanic activity (and may have some ongoing activity today), which is involved in concentrating such elements. Yet the amounts of these elements, their distribution, and many other factors are completely unknown. The MESSENGER spacecraft is studying Mercury’s composition from orbit, bu ...
... had abundant volcanic activity (and may have some ongoing activity today), which is involved in concentrating such elements. Yet the amounts of these elements, their distribution, and many other factors are completely unknown. The MESSENGER spacecraft is studying Mercury’s composition from orbit, bu ...
Kings Dethroned - The Flat Earth Society
... And now it is for us to very carefully study this fundamental idea of the Heliocentric theory, for there is an error in it. Ptolemy had made it appear that the sun and stars revolved around a stationary earth, but Copernicus advanced the theory that it was the earth which revolved around a stationar ...
... And now it is for us to very carefully study this fundamental idea of the Heliocentric theory, for there is an error in it. Ptolemy had made it appear that the sun and stars revolved around a stationary earth, but Copernicus advanced the theory that it was the earth which revolved around a stationar ...
The Celestial Sphere
... First Point of Aries (Υ) The point on the celestial sphere where the ecliptic cuts the equinoctial when the sun just passes the equinoctial from south to north, also known as the vernal equinox position of the sun, which occurs on 21st of March. First Point of Libra The point on the celestial sph ...
... First Point of Aries (Υ) The point on the celestial sphere where the ecliptic cuts the equinoctial when the sun just passes the equinoctial from south to north, also known as the vernal equinox position of the sun, which occurs on 21st of March. First Point of Libra The point on the celestial sph ...
r202 the new astronomy
... This book containing information about 2800 stars and 88 constellations is the result of an enormous work, begun by Prof. Helmut Werner shortly after the Second World War. This project of H. Werner, who was astronomer and member of the staff of the Carl Zeiss firm was continued after his death in 19 ...
... This book containing information about 2800 stars and 88 constellations is the result of an enormous work, begun by Prof. Helmut Werner shortly after the Second World War. This project of H. Werner, who was astronomer and member of the staff of the Carl Zeiss firm was continued after his death in 19 ...
Study Guide for the Comprehensive Final Exam
... Use the Stefan-Boltzmann Law to determine the luminosity, radius or temperature of a star compared to the Sun. Calculate the main sequence lifetime of a star. Describe the role of Open Clusters in defining the Sun’s position in the Milky Way. Describe the Physical Characteristics of Globular Cluster ...
... Use the Stefan-Boltzmann Law to determine the luminosity, radius or temperature of a star compared to the Sun. Calculate the main sequence lifetime of a star. Describe the role of Open Clusters in defining the Sun’s position in the Milky Way. Describe the Physical Characteristics of Globular Cluster ...
Geo-centric astronomy from Pythagoras to Ptolemy File
... Brahe and Kepler. But in their own time, these ideas were mere speculations that were overshadowed 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 Zeu ...
... Brahe and Kepler. But in their own time, these ideas were mere speculations that were overshadowed 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 Zeu ...
1B11 Foundations of Astronomy Star names and magnitudes
... • apparent magnitude – the brightness that a star has on the sky as seen by an observer from Earth. Logarithmic scale defined by Pogson. ...
... • apparent magnitude – the brightness that a star has on the sky as seen by an observer from Earth. Logarithmic scale defined by Pogson. ...
Evolution of a Star
... has evolved into a giant. If the star equals one solar mass, then it becomes a red giant. If the star equals 100 solar masses, then it will become a supergiant. In about 5 billion years, our sun will become a giant. Once the red giant’s core uses its supply of helium, it contracts even more. As the ...
... has evolved into a giant. If the star equals one solar mass, then it becomes a red giant. If the star equals 100 solar masses, then it will become a supergiant. In about 5 billion years, our sun will become a giant. Once the red giant’s core uses its supply of helium, it contracts even more. As the ...
How the Earth Moves Transcript
... flourish in the Arabic world and in Asia, improving the instruments and equipment used to measure the position of cosmic bodies. The more precise measurements led to better compilations and catalogues of the night sky. A radical overhaul of our understanding of the relative position of cosmic bodies ...
... flourish in the Arabic world and in Asia, improving the instruments and equipment used to measure the position of cosmic bodies. The more precise measurements led to better compilations and catalogues of the night sky. A radical overhaul of our understanding of the relative position of cosmic bodies ...
Chapter 13
... • Since more massive stars evolve faster and in a welldefined fashion (at least theoretically speaking), the stars on or off the main sequence will not be random – a cluster of stars will show a distinctive pattern that is tied to the ...
... • Since more massive stars evolve faster and in a welldefined fashion (at least theoretically speaking), the stars on or off the main sequence will not be random – a cluster of stars will show a distinctive pattern that is tied to the ...
Astronomy Timeline
... 130 B.C. - Greek astronomer Hipparchus develops the first accurate star map and star catalogue, and a reliable method to predict solar eclipses 46 B.C. - Julius Caesar, after consulting the astronomer Sosigenes of Alexandria, introduces the Julian Calendar, a regular year of 365 days divided into 12 ...
... 130 B.C. - Greek astronomer Hipparchus develops the first accurate star map and star catalogue, and a reliable method to predict solar eclipses 46 B.C. - Julius Caesar, after consulting the astronomer Sosigenes of Alexandria, introduces the Julian Calendar, a regular year of 365 days divided into 12 ...
low-res - Communicating Astronomy with the Public Journal
... and hold together. If it weren’t for dark matter, our Galaxy would not exist as we know it, and human life would not have developed. Dark matter is more than five times as abundant as all the matter we have detected so far. As cosmologist Sean Carroll says, “Most of the ...
... and hold together. If it weren’t for dark matter, our Galaxy would not exist as we know it, and human life would not have developed. Dark matter is more than five times as abundant as all the matter we have detected so far. As cosmologist Sean Carroll says, “Most of the ...