–1– 2. Milky Way We know a great deal, perhaps more than any
... is about 27 pc above the Galactic plane. Furthermore, the vertical distribution of stars in the solar neighborhood can be approximated by the sum of two exponentials. These were identified as a thin disk and a thick disk components. The stars in the thin and thick disks appear to have different ages ...
... is about 27 pc above the Galactic plane. Furthermore, the vertical distribution of stars in the solar neighborhood can be approximated by the sum of two exponentials. These were identified as a thin disk and a thick disk components. The stars in the thin and thick disks appear to have different ages ...
this article as a PDF
... M42, The Great Orion Nebula. Although it is 1500 light-years away, M42 is a great target to view in small telescopes. This is due not only to its brightness, but also to its wonderful cloud structure, which in telescopes takes on a clearly three-dimensional shape. Observers new and old come back to ...
... M42, The Great Orion Nebula. Although it is 1500 light-years away, M42 is a great target to view in small telescopes. This is due not only to its brightness, but also to its wonderful cloud structure, which in telescopes takes on a clearly three-dimensional shape. Observers new and old come back to ...
Shining Light on the Stars: The Hertzsprung-Russell
... Remember, the HR Diagram shows the temperatures of stars versus their luminosities. Our Sun is located here on the diagram, and as before, the 122 brightest stars visible in the night sky from Earth are located here. But what about all the stars in the nearby solar neighborhood, most of which are to ...
... Remember, the HR Diagram shows the temperatures of stars versus their luminosities. Our Sun is located here on the diagram, and as before, the 122 brightest stars visible in the night sky from Earth are located here. But what about all the stars in the nearby solar neighborhood, most of which are to ...
PHY2083
... Earth is 1 AU from the Sun = 1.49 x 1011m F = L / (4πr2) = 1365 W / m2 This value of the solar flux is known as the “solar irradiance” or “solar constant” ...
... Earth is 1 AU from the Sun = 1.49 x 1011m F = L / (4πr2) = 1365 W / m2 This value of the solar flux is known as the “solar irradiance” or “solar constant” ...
No. 2 - Society for Astronomical Sciences
... DI Her is an eclipsing binary with an eccentric orbit. The resulting apsidal motion can be used to anchor theories of stellar structure and orbit circularization, but it might contain a troubling discrepancy compared to the predictions of general relativity. This article reports on new times of mini ...
... DI Her is an eclipsing binary with an eccentric orbit. The resulting apsidal motion can be used to anchor theories of stellar structure and orbit circularization, but it might contain a troubling discrepancy compared to the predictions of general relativity. This article reports on new times of mini ...
History of astronomy
... The accuracy of Tycho's best positional measurements was +/- 1 arc minute. This was an improvement of a factor of 10 over previous observations. If the stars were closer than 3438 Astronomical Units, Tycho should have been able to measure their trigonometric parallaxes. But he found no parallax for ...
... The accuracy of Tycho's best positional measurements was +/- 1 arc minute. This was an improvement of a factor of 10 over previous observations. If the stars were closer than 3438 Astronomical Units, Tycho should have been able to measure their trigonometric parallaxes. But he found no parallax for ...
Notes 1 - cloudfront.net
... explanations of the positions and movements of stars and other celestial bodies brown dwarfs are the most in the universe stars in sky are mostly giant stars ...
... explanations of the positions and movements of stars and other celestial bodies brown dwarfs are the most in the universe stars in sky are mostly giant stars ...
Educator Guide: Starlab (Grades 6-8)
... rounded shape, but before nuclear reactions begin Red Giant – the later stages of a star after it has exhausted the hydrogen in its core, and begins to fuse together heavier elements. This causes the star to expand and its outer layers cool and take on a reddish hue. Red Supergiant – an especially ...
... rounded shape, but before nuclear reactions begin Red Giant – the later stages of a star after it has exhausted the hydrogen in its core, and begins to fuse together heavier elements. This causes the star to expand and its outer layers cool and take on a reddish hue. Red Supergiant – an especially ...
Unit 3 - Section 9.1 2011 Distances in Space
... The stars do not shift very little when viewed from 300,000,000 kilometers apart A circle has 360O and each degree can be divided into 60 minutes…called “minutes of arc” so they are distinguished from a minute of time. Moreover, each minute of arc contains 60 “seconds of arc.” A parsecond (…or p ...
... The stars do not shift very little when viewed from 300,000,000 kilometers apart A circle has 360O and each degree can be divided into 60 minutes…called “minutes of arc” so they are distinguished from a minute of time. Moreover, each minute of arc contains 60 “seconds of arc.” A parsecond (…or p ...
Grade 9 Academic Science – Unit 3 Space
... The stars do not shift very little when viewed from 300,000,000 kilometers apart A circle has 360O and each degree can be divided into 60 minutes…called “minutes of arc” so they are distinguished from a minute of time. Moreover, each minute of arc contains 60 “seconds of arc.” A parsecond (…or p ...
... The stars do not shift very little when viewed from 300,000,000 kilometers apart A circle has 360O and each degree can be divided into 60 minutes…called “minutes of arc” so they are distinguished from a minute of time. Moreover, each minute of arc contains 60 “seconds of arc.” A parsecond (…or p ...
Globular Cluster M80
... Stars in globular clusters, when compared with the Sun and other stars in the galactic disk, appear to have fewer heavy elements.The tiny amount of heavy elements in these globular cluster stars indicates that they were formed very early in the history of our galaxy.The chemical makeup of stars diff ...
... Stars in globular clusters, when compared with the Sun and other stars in the galactic disk, appear to have fewer heavy elements.The tiny amount of heavy elements in these globular cluster stars indicates that they were formed very early in the history of our galaxy.The chemical makeup of stars diff ...
Evolution of Warm Debris Around Sun-like Stars: Clues to Terrestrial
... Ironically, there are few observational tests of this mature theory. The physical characteristics of the terrestrial planets, their satellites, and the asteroid belt provide constraints on the formation of our solar system (Bottke et al. 2005). Observations of circumstellar dust debris surrounding ...
... Ironically, there are few observational tests of this mature theory. The physical characteristics of the terrestrial planets, their satellites, and the asteroid belt provide constraints on the formation of our solar system (Bottke et al. 2005). Observations of circumstellar dust debris surrounding ...
First Light for May, 2001 - South Bay Astronomical Society
... less optimally aligned galaxies are distorted as well; they are stretched into elliptical shapes along concentric circles surrounding the cluster. A visual inspection yields more of these tangential alignments than radial ones in the cluster field, while the parallel field exhibits no such shape dis ...
... less optimally aligned galaxies are distorted as well; they are stretched into elliptical shapes along concentric circles surrounding the cluster. A visual inspection yields more of these tangential alignments than radial ones in the cluster field, while the parallel field exhibits no such shape dis ...
Homework #2
... same flux as the earth receives from the sun? Other factors, notably rotation and the greenhouse effect can change your answer, but this would be roughly the “habitable zone” for that star. Does your answer depend on the size (i.e., radius) of the planet? 2) Using the descriptors upper and lower and ...
... same flux as the earth receives from the sun? Other factors, notably rotation and the greenhouse effect can change your answer, but this would be roughly the “habitable zone” for that star. Does your answer depend on the size (i.e., radius) of the planet? 2) Using the descriptors upper and lower and ...
mars, antares, the sting and more
... JAMES: NOW THAT WEVE INVESTIGATED THE HEART OF THE SCORPION, HOW ABOUT HIS TAIL? AT THE END OF THE FISHHOOK SHAPE, LOOK FOR TWO STARS THAT ARE VERY CLOSE TOGETHER. THESE ARE THE STARS SHAULA AND LESATH AND TOGETHER THEY ARE KNOWN AS, THE STING. DEAN: MAKES SENSE. ALTHOUGH THESE TWO STARS LOOK CLOSE ...
... JAMES: NOW THAT WEVE INVESTIGATED THE HEART OF THE SCORPION, HOW ABOUT HIS TAIL? AT THE END OF THE FISHHOOK SHAPE, LOOK FOR TWO STARS THAT ARE VERY CLOSE TOGETHER. THESE ARE THE STARS SHAULA AND LESATH AND TOGETHER THEY ARE KNOWN AS, THE STING. DEAN: MAKES SENSE. ALTHOUGH THESE TWO STARS LOOK CLOSE ...
Deep O/IR Survey Of Chandra Galactic Bulge Fields
... analysis suggest that a large subset of the sources are intrinsically hard, and reasonably described by a power law with photon index =0. The typical luminosities of these objects are in the range 10 3133 erg/s. The largest well studied class of objects fitting this description are high magnetic fie ...
... analysis suggest that a large subset of the sources are intrinsically hard, and reasonably described by a power law with photon index =0. The typical luminosities of these objects are in the range 10 3133 erg/s. The largest well studied class of objects fitting this description are high magnetic fie ...
PROBLEM SET #8 SOLUTIONS AST142 1. Free fall timescale and
... with K the kinetic energy. Assuming that there is no rotation show that GM 2 = M σ2 2R (d) An isotropic velocity distribution has velocity dispersions in each direction that are equal σx2 = σy2 = σz2 Show that GM = 6σz2 R This is useful as we can consider σz to be the dispersion of the line of sight ...
... with K the kinetic energy. Assuming that there is no rotation show that GM 2 = M σ2 2R (d) An isotropic velocity distribution has velocity dispersions in each direction that are equal σx2 = σy2 = σz2 Show that GM = 6σz2 R This is useful as we can consider σz to be the dispersion of the line of sight ...
PrimaryReadingComprehension1
... a velocity high enough that they never fall to the ground. They are also high enough or far enough from the Earth that they are mostly free from the friction and drag of Earth’s atmosphere. The velocity required for a satellite to remain in orbit without falling to Earth is called its orbital veloci ...
... a velocity high enough that they never fall to the ground. They are also high enough or far enough from the Earth that they are mostly free from the friction and drag of Earth’s atmosphere. The velocity required for a satellite to remain in orbit without falling to Earth is called its orbital veloci ...
Introduction to Basic Stargazing Part I - Naples Free-Net
... With a calendar, you can have reliable agriculture, which is the basis of civilization. Take your star chart and look for the constellation Hercules, just for an example. You will note that the constellation Hercules as drawn does not look much like a man; constellations only occasionally look like ...
... With a calendar, you can have reliable agriculture, which is the basis of civilization. Take your star chart and look for the constellation Hercules, just for an example. You will note that the constellation Hercules as drawn does not look much like a man; constellations only occasionally look like ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.