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... divided by lengths of the d side. We can also state that the angle θ is equal to the arctangent (the inverse tangent) of the h/d ratio. With just the tangent trigonometric function, we can solve many astronomical geometry problems such as those arising in parallax and triangulation. Parallax Trigono ...
Star Clusters - Caltech Astronomy
... There may also be additional shifts in magnitude and color index resulting from interstellar absorption. The general procedure is to apply the effects of absorption, if known, and then slide the diagrams of the two clusters until they match, according to some goodness-of-fit criterion. The principal ...
... There may also be additional shifts in magnitude and color index resulting from interstellar absorption. The general procedure is to apply the effects of absorption, if known, and then slide the diagrams of the two clusters until they match, according to some goodness-of-fit criterion. The principal ...
Chapter 1: Our Place in the Universe
... • typical relative speeds of more than 70,000 km/hr • but stars are so far away that we cannot easily notice their motion ...
... • typical relative speeds of more than 70,000 km/hr • but stars are so far away that we cannot easily notice their motion ...
Ellipticity, Its Origin and Progression in Comoving Galaxies
... center. They will accelerate in comovement with the aether along one or another radial trajectory, as shown in Fig. 1b. Because the aether expansion has a constant rate, the radial acceleration of the aether is constant. And because aether acceleration is constant, so too is the comoving protogalaxy ...
... center. They will accelerate in comovement with the aether along one or another radial trajectory, as shown in Fig. 1b. Because the aether expansion has a constant rate, the radial acceleration of the aether is constant. And because aether acceleration is constant, so too is the comoving protogalaxy ...
25 Years of the Hubble Space Telescope - Speaker
... Images taken in ultraviolet light by Hubble’s Space Telescope Imaging Spectrograph (STIS) show both Jupiter auroras in 1998, the oval-shaped objects in the inset photos. Ground-based telescopes cannot view these phenomena in ultraviolet light, as it is blocked by the Earth’s atmosphere. Auroras are ...
... Images taken in ultraviolet light by Hubble’s Space Telescope Imaging Spectrograph (STIS) show both Jupiter auroras in 1998, the oval-shaped objects in the inset photos. Ground-based telescopes cannot view these phenomena in ultraviolet light, as it is blocked by the Earth’s atmosphere. Auroras are ...
Cuesta College Eclipsing Binary Project Briefing
... Hipparcose, in 250 BC, and using only his unaided eye, classified all the visible stars into 6 categories. With the invention of the telescope much later, astronomers found that they could improve on this classification by measuring the size of the star and several means were devised, including usin ...
... Hipparcose, in 250 BC, and using only his unaided eye, classified all the visible stars into 6 categories. With the invention of the telescope much later, astronomers found that they could improve on this classification by measuring the size of the star and several means were devised, including usin ...
bode elert johann
... he was later so proud as to cite the instrument in his (mainly musical) autobiographical “Memorandums”.20 Alternatively it may date from 1778, for on 28 January 1778 he observed “Syrius” in the hope of finding a nearby star suitable for parallax observations,21 and he did the same for Procyon and Ca ...
... he was later so proud as to cite the instrument in his (mainly musical) autobiographical “Memorandums”.20 Alternatively it may date from 1778, for on 28 January 1778 he observed “Syrius” in the hope of finding a nearby star suitable for parallax observations,21 and he did the same for Procyon and Ca ...
Asteroids, Comets & Meteors Teacher's Guide
... HECTOR A & B 230 km (142 miles) in diameter each. Actually, two C-Type Trojan asteroids that either orbit each other very closely, or actually touch. Both oblong shaped, they are the largest irregular shaped asteroids. ICARUS 1 km (.62 miles) in diameter. Discovered in 1949, this Apollo asteroid’s o ...
... HECTOR A & B 230 km (142 miles) in diameter each. Actually, two C-Type Trojan asteroids that either orbit each other very closely, or actually touch. Both oblong shaped, they are the largest irregular shaped asteroids. ICARUS 1 km (.62 miles) in diameter. Discovered in 1949, this Apollo asteroid’s o ...
DUSTY CIRCUMSTELLAR DISKS B. Zuckerman
... range, because such stars are hard to identify with IR and optical techniques. Recently, surveys of X-ray emission, especially with the German ROSAT satellite, have enabled detection of many stars that appear to be old or post T Tauri stars (e.g., Neuhäuser 1997). Such stars have been discovered be ...
... range, because such stars are hard to identify with IR and optical techniques. Recently, surveys of X-ray emission, especially with the German ROSAT satellite, have enabled detection of many stars that appear to be old or post T Tauri stars (e.g., Neuhäuser 1997). Such stars have been discovered be ...
Astronomical Facts `n Stuff
... The Airy disk is the brightest spot formed by a star image as seen through a telescope. It is surrounded by alternating rings of light and dark (these are due to diffraction - any light passing through an aperture is diffracted, and the effect is inversely proportional to the size of the aperture.) ...
... The Airy disk is the brightest spot formed by a star image as seen through a telescope. It is surrounded by alternating rings of light and dark (these are due to diffraction - any light passing through an aperture is diffracted, and the effect is inversely proportional to the size of the aperture.) ...
2009, 1st. Quarter, Vol 24, No 1
... The winter BMAA monthly meetings of 2009 have been anything but dull and dreary. We have been blessed with some great guest speakers and topics to get us excited about observing now that spring is finally underway. If your observing sessions have been a little unfocused lately, our past few presente ...
... The winter BMAA monthly meetings of 2009 have been anything but dull and dreary. We have been blessed with some great guest speakers and topics to get us excited about observing now that spring is finally underway. If your observing sessions have been a little unfocused lately, our past few presente ...
First Census of Galaxies Near Cosmic Dawn The Night Sky
... NASA Probes Prepare for Mission-Ending Moon Impact ...
... NASA Probes Prepare for Mission-Ending Moon Impact ...
starry night companion
... Bright stars and dimmer ones, tightly knit clusters with many points of light and dark patches with nothing at all. Stars, stars everywhere, stretching off to the horizon in all directions, as far as the eye can see. But which one of those bright points is the North Star? Is that reddish dot Mars or ...
... Bright stars and dimmer ones, tightly knit clusters with many points of light and dark patches with nothing at all. Stars, stars everywhere, stretching off to the horizon in all directions, as far as the eye can see. But which one of those bright points is the North Star? Is that reddish dot Mars or ...
Chapter 17--Star Stuff
... The length of time from the formation of a protostar to the birth of a main-sequence star depends on the star’s mass. Massive stars do everything faster. The contraction of a high-mass protostar into a main-sequence star may take only a million years or less. A star like our Sun takes about 50 milli ...
... The length of time from the formation of a protostar to the birth of a main-sequence star depends on the star’s mass. Massive stars do everything faster. The contraction of a high-mass protostar into a main-sequence star may take only a million years or less. A star like our Sun takes about 50 milli ...
3.2 Black body Radiation
... studied using telescopes placed above the atmosphere. Only in the optical and radio regions of the spectrum are there large atmospheric windows - portions of the EMR spectrum for which the atmosphere is at least partially transparent- which allow us to study the universe. Study of wavelengths that d ...
... studied using telescopes placed above the atmosphere. Only in the optical and radio regions of the spectrum are there large atmospheric windows - portions of the EMR spectrum for which the atmosphere is at least partially transparent- which allow us to study the universe. Study of wavelengths that d ...
The Clouds
... beacons in a steady-state Universe. They could have come into existence in the early Universe, or simply built up through collisions and coagulation of clouds of atoms. Although normal stars like our Sun consist of atoms and the gas from which they originate was also atomic, stars are born in molecu ...
... beacons in a steady-state Universe. They could have come into existence in the early Universe, or simply built up through collisions and coagulation of clouds of atoms. Although normal stars like our Sun consist of atoms and the gas from which they originate was also atomic, stars are born in molecu ...
Ursa Major
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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.