Parallax
... System. The Hipparcos satellite has taken these measurements for over 100,000 nearby stars. This provides the basis for all other distance measurements in astronomy, the cosmic distance ladder. Here, the term "parallax" is the angle or semi-angle of inclination between two sightlines to the star. Pa ...
... System. The Hipparcos satellite has taken these measurements for over 100,000 nearby stars. This provides the basis for all other distance measurements in astronomy, the cosmic distance ladder. Here, the term "parallax" is the angle or semi-angle of inclination between two sightlines to the star. Pa ...
Deneb - Emmi
... Phaethon’s father agreed to let Phaethon drive his sun chariot, and because of his bad driving that threatened to destroy the earth. Zeus hurled a thunderbolt at Phaethon, who fell into the Fridanus River. Phaethon's friend, Cygnus, dived into the water in search of Phaethon. Apollo took pity on Cyg ...
... Phaethon’s father agreed to let Phaethon drive his sun chariot, and because of his bad driving that threatened to destroy the earth. Zeus hurled a thunderbolt at Phaethon, who fell into the Fridanus River. Phaethon's friend, Cygnus, dived into the water in search of Phaethon. Apollo took pity on Cyg ...
Notes on Stars
... Example: Using the Saha and Boltzmann formulae, how can we understand the variation of the Balmer line strengths along the Harvard sequence? As the excitation occurs from the n = 2 state, the temperature has to be high enough to populate this level. This is the case for most of the stars. The n = 2 ...
... Example: Using the Saha and Boltzmann formulae, how can we understand the variation of the Balmer line strengths along the Harvard sequence? As the excitation occurs from the n = 2 state, the temperature has to be high enough to populate this level. This is the case for most of the stars. The n = 2 ...
Spring 2015 Mercury - Astronomical Society of the Pacific
... Astronomers had long theorized about how stars and solar systems form inside nebulae, but improved optics combined with the image clarity possible above the Earth’s atmosphere allowed astronomers to literally witness creation. Images of the spectacular “Pillars of Creation” inside the Eagle Nebula r ...
... Astronomers had long theorized about how stars and solar systems form inside nebulae, but improved optics combined with the image clarity possible above the Earth’s atmosphere allowed astronomers to literally witness creation. Images of the spectacular “Pillars of Creation” inside the Eagle Nebula r ...
Project Description - SDSS-III
... Universe imprint a characteristic scale on the clustering of dark matter, galaxies, and intergalactic gas. By measuring this scale with tracers seen at different redshifts, we can create a “Hubble diagram” of unprecedented precision covering most of cosmic history and can thereby pin down the prope ...
... Universe imprint a characteristic scale on the clustering of dark matter, galaxies, and intergalactic gas. By measuring this scale with tracers seen at different redshifts, we can create a “Hubble diagram” of unprecedented precision covering most of cosmic history and can thereby pin down the prope ...
Chap2-RadialVelocity
... and the combination K=f(a,e,P,i). Two additional terms are usually taken into account: (1) the systemic velocity Υ describing the constant component of the radial velocity of the system’s centre of mass relative to the solar system barycentre and (2) a linear trend parameter d,which may accommodate ...
... and the combination K=f(a,e,P,i). Two additional terms are usually taken into account: (1) the systemic velocity Υ describing the constant component of the radial velocity of the system’s centre of mass relative to the solar system barycentre and (2) a linear trend parameter d,which may accommodate ...
JRASC, June 2014 Issue (PDF, low resolution)
... The Journal is a bi-monthly publication of The Royal Astronomical Society of Canada and is devoted to the advancement of astronomy and allied sciences. It contains articles on Canadian astronomers and current activities of the RASC and its Centres, research and review papers by professional and ama ...
... The Journal is a bi-monthly publication of The Royal Astronomical Society of Canada and is devoted to the advancement of astronomy and allied sciences. It contains articles on Canadian astronomers and current activities of the RASC and its Centres, research and review papers by professional and ama ...
A Starscape in Red and Blue - Royal Astronomical Society of Canada
... The Journal is a bi-monthly publication of The Royal Astronomical Society of Canada and is devoted to the advancement of astronomy and allied sciences. It contains articles on Canadian astronomers and current activities of the RASC and its Centres, research and review papers by professional and ama ...
... The Journal is a bi-monthly publication of The Royal Astronomical Society of Canada and is devoted to the advancement of astronomy and allied sciences. It contains articles on Canadian astronomers and current activities of the RASC and its Centres, research and review papers by professional and ama ...
The distributions and ages of refractory objects in the solar nebula
... bits. Solid bodies thus had their motions impeded by the gas, and lost energy and angular momentum to the gas, spiraling inwards over time (Adachi et al., 1976; Weidenschilling, 1977; Cuzzi and Weidenschilling, 2006). The inward drift velocity of solids was a strong function of the size of the solid ...
... bits. Solid bodies thus had their motions impeded by the gas, and lost energy and angular momentum to the gas, spiraling inwards over time (Adachi et al., 1976; Weidenschilling, 1977; Cuzzi and Weidenschilling, 2006). The inward drift velocity of solids was a strong function of the size of the solid ...
Detection of Earth-impacting asteroids with the next generation all
... pletion but lower risk and lower cost). Their recommendation dovetailed nicely with the Astronomy and Astrophysics Survey Committee (2001) Decadal Report that made a strong case for the development of a large synoptic survey telescope that would provide the necessary depth and sky coverage to identi ...
... pletion but lower risk and lower cost). Their recommendation dovetailed nicely with the Astronomy and Astrophysics Survey Committee (2001) Decadal Report that made a strong case for the development of a large synoptic survey telescope that would provide the necessary depth and sky coverage to identi ...
Cycles of magnetic activity in solar-type stars. The place of the Sun
... these 50 stars with cycles they have found only 12 stars and the Sun to be characterized by the cyclic activity of the "Excellent" class. We illustrate the method of cyclic period calculation with Scargle’s periodogram technique on the example of the Sun. We obtained the periodogram of the yearly av ...
... these 50 stars with cycles they have found only 12 stars and the Sun to be characterized by the cyclic activity of the "Excellent" class. We illustrate the method of cyclic period calculation with Scargle’s periodogram technique on the example of the Sun. We obtained the periodogram of the yearly av ...
Observations, Modeling and Theory of Debris Disks
... in thermal emission or scattered light. These disks may persist over Gyrs through steady-state evolution and/or may also experience sporadic stirring and major collisional breakups, rendering them atypically bright for brief periods of time. Most interestingly, they provide direct evidence that the ...
... in thermal emission or scattered light. These disks may persist over Gyrs through steady-state evolution and/or may also experience sporadic stirring and major collisional breakups, rendering them atypically bright for brief periods of time. Most interestingly, they provide direct evidence that the ...
FIELD ASTRONOMY
... observations and to solve the PZS triangle, the surveyor must have one other factor. He must know the precise time of the observation so that he can fix the position of the terrestrial or horizon system of coordinates in relation to the celestial coordinate system. In the field of practical astrono ...
... observations and to solve the PZS triangle, the surveyor must have one other factor. He must know the precise time of the observation so that he can fix the position of the terrestrial or horizon system of coordinates in relation to the celestial coordinate system. In the field of practical astrono ...
Observations, Modeling and Theory of Debris Disks
... in thermal emission or scattered light. These disks may persist over Gyrs through steady-state evolution and/or may also experience sporadic stirring and major collisional breakups, rendering them atypically bright for brief periods of time. Most interestingly, they provide direct evidence that the ...
... in thermal emission or scattered light. These disks may persist over Gyrs through steady-state evolution and/or may also experience sporadic stirring and major collisional breakups, rendering them atypically bright for brief periods of time. Most interestingly, they provide direct evidence that the ...
Mastering the PACT - Darlington Middle School
... • Answer questions you are sure about first. If you do not know the answer to a question, skip it and go back to that question later. • Think positively. Some problems may seem hard to you, but you may be able to figure out what to do if you read each question carefully. • If no figure is provided, ...
... • Answer questions you are sure about first. If you do not know the answer to a question, skip it and go back to that question later. • Think positively. Some problems may seem hard to you, but you may be able to figure out what to do if you read each question carefully. • If no figure is provided, ...
The Project Gutenberg eBook #32000: An
... difficulties when they are encountered at the beginning of the subject. It is believed that the present treatment prepares so thoroughly for their study and leads so naturally to them that their mastery will not be found difficult. The chapter on telescopes has been regretfully omitted because it wa ...
... difficulties when they are encountered at the beginning of the subject. It is believed that the present treatment prepares so thoroughly for their study and leads so naturally to them that their mastery will not be found difficult. The chapter on telescopes has been regretfully omitted because it wa ...
Analysis of Angular Momentum in Planetary Systems and Host Stars
... stars rotate more slowly with and have smaller moments of inertia, and as a result they contain much less spin angular momentum. A secondary power law describes the upper bound of angular momenta of these less massive stars with a steeper slope. The Solar System’s orbital angular momentum, however, ...
... stars rotate more slowly with and have smaller moments of inertia, and as a result they contain much less spin angular momentum. A secondary power law describes the upper bound of angular momenta of these less massive stars with a steeper slope. The Solar System’s orbital angular momentum, however, ...
Giovanni Domenico Cassini
... In 1653, Cassini, wishing to employ such an instrument, sketched a plan for a new and larger [gnomon] but one which would be difficult to build. His calculations were precise; the construction succeeded perfectly; and its success made Cassini a brilliant reputation. He made many important observati ...
... In 1653, Cassini, wishing to employ such an instrument, sketched a plan for a new and larger [gnomon] but one which would be difficult to build. His calculations were precise; the construction succeeded perfectly; and its success made Cassini a brilliant reputation. He made many important observati ...
ALMA - ESO
... Detect the Milky Way at z=3 Measure dust broadband emission and spectral line radiation from atoms and molecules in high-z galaxies to obtain detailed morphology and kinematics ...
... Detect the Milky Way at z=3 Measure dust broadband emission and spectral line radiation from atoms and molecules in high-z galaxies to obtain detailed morphology and kinematics ...
Histograms Constructed from the Data of 239Pu Alpha
... away from the celestial equator. This supposition has proved to be true. Indeed, the histogram sequences preceding the equinox moments were similar to the inverse sequences following this moments. The palindrome effect (detected with the procedure C; cf. Fig. 1), is illustrated in Fig. 5. As reveale ...
... away from the celestial equator. This supposition has proved to be true. Indeed, the histogram sequences preceding the equinox moments were similar to the inverse sequences following this moments. The palindrome effect (detected with the procedure C; cf. Fig. 1), is illustrated in Fig. 5. As reveale ...
Formation and evolution of the Solar System
The formation of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.This widely accepted model, known as the nebular hypothesis, was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace. Its subsequent development has interwoven a variety of scientific disciplines including astronomy, physics, geology, and planetary science. Since the dawn of the space age in the 1950s and the discovery of extrasolar planets in the 1990s, the model has been both challenged and refined to account for new observations.The Solar System has evolved considerably since its initial formation. Many moons have formed from circling discs of gas and dust around their parent planets, while other moons are thought to have formed independently and later been captured by their planets. Still others, such as the Moon, may be the result of giant collisions. Collisions between bodies have occurred continually up to the present day and have been central to the evolution of the Solar System. The positions of the planets often shifted due to gravitational interactions. This planetary migration is now thought to have been responsible for much of the Solar System's early evolution.In roughly 5 billion years, the Sun will cool and expand outward many times its current diameter (becoming a red giant), before casting off its outer layers as a planetary nebula and leaving behind a stellar remnant known as a white dwarf. In the far distant future, the gravity of passing stars will gradually reduce the Sun's retinue of planets. Some planets will be destroyed, others ejected into interstellar space. Ultimately, over the course of tens of billions of years, it is likely that the Sun will be left with none of the original bodies in orbit around it.