Stars and Star Patterns
... The North Star is called Polaris and located directly above the North Pole. This star appears in the same place every night all year long. In the Northern Hemisphere, if you find Polaris you will be able to tell which direction is north. ...
... The North Star is called Polaris and located directly above the North Pole. This star appears in the same place every night all year long. In the Northern Hemisphere, if you find Polaris you will be able to tell which direction is north. ...
Chapter 21 notes - Clinton Public Schools
... found, the dimmer star can be detected by observing the effects of its gravity: a wobble back and forth Eclipsing binary: a system in which one star periodically blocks the light from another. so one seems to dim regularly ...
... found, the dimmer star can be detected by observing the effects of its gravity: a wobble back and forth Eclipsing binary: a system in which one star periodically blocks the light from another. so one seems to dim regularly ...
Mapping the Stars
... • It is an object that is so massive that even light cannot escape its gravity. • They form sometimes from the leftovers of a supernova that has collapsed. • How are black holes found by astronomers? • Sometimes gas or dust from a nearby star will spiral into the black hole and give off X rays to he ...
... • It is an object that is so massive that even light cannot escape its gravity. • They form sometimes from the leftovers of a supernova that has collapsed. • How are black holes found by astronomers? • Sometimes gas or dust from a nearby star will spiral into the black hole and give off X rays to he ...
Engineering the Heavens
... what we now call Halley’s Comet), calculated that based on the best measurements up to then, the fixed stars had to be at least 20,000 to 30,000 times farther than the sun. In short, the lack of detectable parallax was an instrumental issue, which (to use modern language) simply put a lower bound on ...
... what we now call Halley’s Comet), calculated that based on the best measurements up to then, the fixed stars had to be at least 20,000 to 30,000 times farther than the sun. In short, the lack of detectable parallax was an instrumental issue, which (to use modern language) simply put a lower bound on ...
Where is the rest of the universe?
... Where is the rest of the Universe? If we can only “see” 4.9% of the universe, where is the other 95%? Dark matter Dark matter does not give off observable energy in any EM wavelength, but can be detected by watching the behavior of space objects. A few examples are: • The stars in the outer reaches ...
... Where is the rest of the Universe? If we can only “see” 4.9% of the universe, where is the other 95%? Dark matter Dark matter does not give off observable energy in any EM wavelength, but can be detected by watching the behavior of space objects. A few examples are: • The stars in the outer reaches ...
CONSTELLATION TUCANA, THE TOUCAN
... from binary star mergers. 47 Tucanae has an apparent magnitude of 3.9, meaning that it is visible to the naked eye; it is a Shapley class III cluster, which means that it has a clearly defined nucleus. Near to 47 Tucana on the sky, and often seen in wide-field photographs showing it, are two much mo ...
... from binary star mergers. 47 Tucanae has an apparent magnitude of 3.9, meaning that it is visible to the naked eye; it is a Shapley class III cluster, which means that it has a clearly defined nucleus. Near to 47 Tucana on the sky, and often seen in wide-field photographs showing it, are two much mo ...
AY1 Homework for Quiz 2: Spring 2017
... ___ D. It will be supported against gravity by electron degeneracy forces ...
... ___ D. It will be supported against gravity by electron degeneracy forces ...
Lecture 1 Coordinate Systems - Department of Physics & Astronomy
... distance of only 1000 pc (only 1/8 of way to centerof our galaxy) •The planned Space Interferometry Mission will be able to determine parallax angles as small as 4 microarcsec = 0.000004”) leading to distance measurements of objects up to 250 kpc. ...
... distance of only 1000 pc (only 1/8 of way to centerof our galaxy) •The planned Space Interferometry Mission will be able to determine parallax angles as small as 4 microarcsec = 0.000004”) leading to distance measurements of objects up to 250 kpc. ...
Powerpoint Presentation (large file)
... By carefully examining a star’s spectral lines, astronomers can determine whether that star is a main-sequence star, giant, supergiant, or white dwarf ...
... By carefully examining a star’s spectral lines, astronomers can determine whether that star is a main-sequence star, giant, supergiant, or white dwarf ...
What`s Up - April 2016
... seen by the eye as a single bright star is easily separated by a small telescope into a brilliant pair of yellow stars, Alpha Centauri A and B. The brighter one is about half again as bright as our sun, the fainter about half as bright as the sun. Separated by about 23 times the distance from the Ea ...
... seen by the eye as a single bright star is easily separated by a small telescope into a brilliant pair of yellow stars, Alpha Centauri A and B. The brighter one is about half again as bright as our sun, the fainter about half as bright as the sun. Separated by about 23 times the distance from the Ea ...
Section 19.2
... • Luminosity is the total amount of light given off by a star in all directions. • Luminosity is a fundamental property of a star whereas brightness depends on both luminosity and distance. ...
... • Luminosity is the total amount of light given off by a star in all directions. • Luminosity is a fundamental property of a star whereas brightness depends on both luminosity and distance. ...
Fulltext PDF - Indian Academy of Sciences
... are known as optical double stars. Or, it could be that they are really bound to each other in their mutual gravitational field. Then they are known as binary stars. A catalogue of stars, published in 1782, contained 227 double stars. Another one, published only two years later, had 432 on its list. ...
... are known as optical double stars. Or, it could be that they are really bound to each other in their mutual gravitational field. Then they are known as binary stars. A catalogue of stars, published in 1782, contained 227 double stars. Another one, published only two years later, had 432 on its list. ...
Introduction to Basic Stargazing Part II - Naples Free-Net
... astronomical unit (au) – one au is defined as the average distance from Earth to the Sun. There are two reasons for this; 1. It greatly improves computational ease of raw data. 2. It improves comprehension of relative distances. For example, the astronomical unit is measured at 92,956,000 miles. If ...
... astronomical unit (au) – one au is defined as the average distance from Earth to the Sun. There are two reasons for this; 1. It greatly improves computational ease of raw data. 2. It improves comprehension of relative distances. For example, the astronomical unit is measured at 92,956,000 miles. If ...
Colour-magnitude diagram of an open cluster
... the difference between absolute and apparent magnitude is the distance modulus, (m − M)0 = 5 log10 D − 5 where the distance D is in parsec. A parsec is the distance from which the Earth’s orbit around the Sun has an apparent radius of one arc second, corresponding to about 3.1 × 1016 meters. Hence, ...
... the difference between absolute and apparent magnitude is the distance modulus, (m − M)0 = 5 log10 D − 5 where the distance D is in parsec. A parsec is the distance from which the Earth’s orbit around the Sun has an apparent radius of one arc second, corresponding to about 3.1 × 1016 meters. Hence, ...
Weighing the universe—6 Dec AST207 F2010 12/6/2010
... • A Type I supernova is a white dwarf that explodes. – A WD and giant orbit each other. – Mass moves from the giant to the WD. – WD explodes when it gets so much mass from the giant that degeneracy pressure can no longer oppose gravity. ...
... • A Type I supernova is a white dwarf that explodes. – A WD and giant orbit each other. – Mass moves from the giant to the WD. – WD explodes when it gets so much mass from the giant that degeneracy pressure can no longer oppose gravity. ...
Passport to the Universe Educator`s Guide Text
... the Earth and the other planets in the larger scheme of things. From out here, the sizes of and distances between the Earth, Sun, and other planets appear relatively small. On our trip, we pass three of the eight planets—Mars, Jupiter (and its moons, Io and Europa), and Saturn. We now head out for ...
... the Earth and the other planets in the larger scheme of things. From out here, the sizes of and distances between the Earth, Sun, and other planets appear relatively small. On our trip, we pass three of the eight planets—Mars, Jupiter (and its moons, Io and Europa), and Saturn. We now head out for ...
CBradleyLoutl
... -H I zones, containing neutral hydrogen, with a temperature often around 100K -H II zones, containing ionized hydrogen, with a temperature often around 10,000K. The clouds absorb ultraviolet light and retransmitted it as visible/IR light. These clouds are visible as nebulae. Density in these nebulae ...
... -H I zones, containing neutral hydrogen, with a temperature often around 100K -H II zones, containing ionized hydrogen, with a temperature often around 10,000K. The clouds absorb ultraviolet light and retransmitted it as visible/IR light. These clouds are visible as nebulae. Density in these nebulae ...
Astronomy Triemester Review Sheet 2015
... 6. What fuel source is used to power stars? What happens when that first source is used? 7. Describe how small and large stars move through their life cycles and die. Use the terms: red giant, planetary nebula, white dwarf, supergiant, super nova, neutron star, black hole, main sequence 8. What is t ...
... 6. What fuel source is used to power stars? What happens when that first source is used? 7. Describe how small and large stars move through their life cycles and die. Use the terms: red giant, planetary nebula, white dwarf, supergiant, super nova, neutron star, black hole, main sequence 8. What is t ...
LECTURE 2: I.Our Place in the Universe
... The scale of the numbers associated with the economy can be larger than those relevant to astrophysics: 1. Moon-Earth distance: 384,000 km = 3.84x105 - it take US government exactly 8 sec to generate $384,000 of debt 2. Mars-Earth distance: 55 million km = 5.5x107 - in $$, this is as large as the tw ...
... The scale of the numbers associated with the economy can be larger than those relevant to astrophysics: 1. Moon-Earth distance: 384,000 km = 3.84x105 - it take US government exactly 8 sec to generate $384,000 of debt 2. Mars-Earth distance: 55 million km = 5.5x107 - in $$, this is as large as the tw ...
Slide 1
... By mid 20th century -- 3 models or theories Big Bang -- Father LeMaitre, George Gamow Oscillating Universe ...
... By mid 20th century -- 3 models or theories Big Bang -- Father LeMaitre, George Gamow Oscillating Universe ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.