Astrophysics
... b) (2 points) Find Rs in parsecs for an O star if Φ=1049 photons/s, n = 10 atoms/cm3 , and α = 2 × 10−13 . c) (2 points) Find Rs in parsecs for the sun if Φ = 5×1023 photons/s, while n and α remain the same. d) (3 points) Could the cloud around the sun be seen by an astronomer on α-Centauri (distanc ...
... b) (2 points) Find Rs in parsecs for an O star if Φ=1049 photons/s, n = 10 atoms/cm3 , and α = 2 × 10−13 . c) (2 points) Find Rs in parsecs for the sun if Φ = 5×1023 photons/s, while n and α remain the same. d) (3 points) Could the cloud around the sun be seen by an astronomer on α-Centauri (distanc ...
Star Powerpoint notes
... miles) away. It takes light about 4 years to reach the Earth from there. How luminous is the Sun compared with other stars? The most luminous stars are about a million times brighter and the least luminous stars are about a hundred thousand times dimmer than the Sun. ...
... miles) away. It takes light about 4 years to reach the Earth from there. How luminous is the Sun compared with other stars? The most luminous stars are about a million times brighter and the least luminous stars are about a hundred thousand times dimmer than the Sun. ...
Kepler`s Law - New Mexico Tech
... demise of a star of very high solar masses or more. Either a neutron star or a black hole is left over. •What type of object is left over from a Type II Supernova? ...
... demise of a star of very high solar masses or more. Either a neutron star or a black hole is left over. •What type of object is left over from a Type II Supernova? ...
Chapter 8 Lesson 4 Stars and Constellations
... 3. Red stars and orange stars are cooler than the Sun, and blue stars and white stars are warmer. ...
... 3. Red stars and orange stars are cooler than the Sun, and blue stars and white stars are warmer. ...
Solar System from Web
... demise of a star of very high solar masses or more. Either a neutron star or a black hole is left over. •What type of object is left over from a Type II Supernova? ...
... demise of a star of very high solar masses or more. Either a neutron star or a black hole is left over. •What type of object is left over from a Type II Supernova? ...
4.1 – 4.3 - s3.amazonaws.com
... –resemble an egg or a football –not as structured • irregular galaxies –groups of stars that have no defined shapes –the Large Magellanic Cloud and Small Magellanic Cloud »the two closest galaxies to ours ...
... –resemble an egg or a football –not as structured • irregular galaxies –groups of stars that have no defined shapes –the Large Magellanic Cloud and Small Magellanic Cloud »the two closest galaxies to ours ...
The Solar Neighborhood
... The globular star clusters are bright, and can be seen for a long distance. Their distances can be estimated accurately from their main sequence turnoffs, as well as by measuring the periods of variable stars that belong to each cluster. In the table below are listed several dozen Galactic globular ...
... The globular star clusters are bright, and can be seen for a long distance. Their distances can be estimated accurately from their main sequence turnoffs, as well as by measuring the periods of variable stars that belong to each cluster. In the table below are listed several dozen Galactic globular ...
OUSNMAY06 - The George Abell Observatory
... the borders of Canes Venatici and Ursa Major. NGC4395 (11.0) sg. Bright core with a low surface brightness circular halo. NGC4449 (10.5) ir. Appears almost rectangular making it an unusual object to view. NGC4485 (12.5) ir and NGC4490 (10.1) sg. Interacting pair of galaxies. NGC4631 (9.7) sg and NG4 ...
... the borders of Canes Venatici and Ursa Major. NGC4395 (11.0) sg. Bright core with a low surface brightness circular halo. NGC4449 (10.5) ir. Appears almost rectangular making it an unusual object to view. NGC4485 (12.5) ir and NGC4490 (10.1) sg. Interacting pair of galaxies. NGC4631 (9.7) sg and NG4 ...
10 Million light-years Million light
... Million light-years. Our galaxy is indistinguishable from the other galaxies in our Local Group. It would take light over 10 million years to travel across this image. ...
... Million light-years. Our galaxy is indistinguishable from the other galaxies in our Local Group. It would take light over 10 million years to travel across this image. ...
Cosmic Survey PowerPoint
... Some points: Almost all students will grab the Sun, Moon and Saturn pictures together, demonstrating that they, like most astronomers, have a theory about solar system formation. But which is the exact order of age? Current theories of moon formation suggest it was formed by a collision of a Mars-si ...
... Some points: Almost all students will grab the Sun, Moon and Saturn pictures together, demonstrating that they, like most astronomers, have a theory about solar system formation. But which is the exact order of age? Current theories of moon formation suggest it was formed by a collision of a Mars-si ...
Astr604-Ch1
... the mass of star that is member of a binary system can calculate based on spectral line shifts. The radii of a number of stars have been found directly from measurement of their angular radii by means of an interferometer. Very seldom, in eclipsing binary systems, may the radius of a star be directl ...
... the mass of star that is member of a binary system can calculate based on spectral line shifts. The radii of a number of stars have been found directly from measurement of their angular radii by means of an interferometer. Very seldom, in eclipsing binary systems, may the radius of a star be directl ...
How Big is the Solar System?
... structure called a supercluster. Superclusters are groupings of galaxies on very large scales (100s of millions of light years). In between these superclusters are large voids of space where any space traveler would encounter very little in the way of galaxies or matter. Our close neighbors include ...
... structure called a supercluster. Superclusters are groupings of galaxies on very large scales (100s of millions of light years). In between these superclusters are large voids of space where any space traveler would encounter very little in the way of galaxies or matter. Our close neighbors include ...
1 - Stars: Introduction
... Stars are classified by giving a number 1 - 6 • Brightest stars are class 1 • Dimmest stars visible to naked eye are class 6 • Class 1 is twice as bright as class 2, class 2 is twice as bright as class 3, and so on. • Therefore, class 1 is 26 = 64 )mes as bright as class 6 Modified in ...
... Stars are classified by giving a number 1 - 6 • Brightest stars are class 1 • Dimmest stars visible to naked eye are class 6 • Class 1 is twice as bright as class 2, class 2 is twice as bright as class 3, and so on. • Therefore, class 1 is 26 = 64 )mes as bright as class 6 Modified in ...
- National Optical Astronomy Observatory
... To determine the magnitudes of the other cluster members, NGC1496-22 was used as a reference in both filters. Star 22 was chosen because its magnitude was known from the WEBDA site; however, the software should calculate the same magnitudes for the entire data set if any other reference star had be ...
... To determine the magnitudes of the other cluster members, NGC1496-22 was used as a reference in both filters. Star 22 was chosen because its magnitude was known from the WEBDA site; however, the software should calculate the same magnitudes for the entire data set if any other reference star had be ...
Galaxies - science1d
... Our solar system is very tiny compared to the whole Milky Way A beam of light from the Sun would take 100 000 years to cross the entire Milky Way But it takes only 5 hrs to get to Neptune! :o ...
... Our solar system is very tiny compared to the whole Milky Way A beam of light from the Sun would take 100 000 years to cross the entire Milky Way But it takes only 5 hrs to get to Neptune! :o ...
ASTR 1120H – Spring Semester 2010 Exam 2 – Answers The
... 7. Briefly describe how you would determine the distance to a star whose trigonometric parallax is too small to measure. ...
... 7. Briefly describe how you would determine the distance to a star whose trigonometric parallax is too small to measure. ...
Making H-R Diagrams - PLC-METS
... temperatures, different brightness, different sizes, and different distances from Earth. A star’s mass dictates how bright it will be, how long it will live, its temperature and its size. The Sun is the center of our solar system and is very bright to us on Earth. Other stars in our galaxy are brigh ...
... temperatures, different brightness, different sizes, and different distances from Earth. A star’s mass dictates how bright it will be, how long it will live, its temperature and its size. The Sun is the center of our solar system and is very bright to us on Earth. Other stars in our galaxy are brigh ...
STAAR Review – Week Ten
... 12. In the center of the Milky Way is a large bulge of stars. Within this bulge lies a black hole. The Sun is located – a. outside of the Milky Way. b. in the large bulge of stars near the center of the Milky Way. c. in the black hole in the center of the Milky Way. d. near the edge of the Milky Way ...
... 12. In the center of the Milky Way is a large bulge of stars. Within this bulge lies a black hole. The Sun is located – a. outside of the Milky Way. b. in the large bulge of stars near the center of the Milky Way. c. in the black hole in the center of the Milky Way. d. near the edge of the Milky Way ...
The Curtis-Shapley debate – two different views of
... This meant that Shapley was proved more correct about the size of our galaxy and the position of the Sun in it, but Curtis was proved correct that our Universe was composed of many more galaxies, and that spiral nebulae were galaxies just like our own. However the measurements of Cepheid variable s ...
... This meant that Shapley was proved more correct about the size of our galaxy and the position of the Sun in it, but Curtis was proved correct that our Universe was composed of many more galaxies, and that spiral nebulae were galaxies just like our own. However the measurements of Cepheid variable s ...
The Milky Way Galaxy (ch. 23)
... life as a roughly spherical cloud, and later flattened into a disk. ...
... life as a roughly spherical cloud, and later flattened into a disk. ...
Basics about stars
... Variable stars as RR Lyrae and Cepheids have a PeriodLuminosity relation. By measuring the distance to nearby Cepheids (using eg method 1 or 2) one can calibrate the PLR to absolute magnitudes. A measurement of a cepheids period can then be used to determine the absolute luminosity and therefore the ...
... Variable stars as RR Lyrae and Cepheids have a PeriodLuminosity relation. By measuring the distance to nearby Cepheids (using eg method 1 or 2) one can calibrate the PLR to absolute magnitudes. A measurement of a cepheids period can then be used to determine the absolute luminosity and therefore the ...
Document
... Globular cluster – tight groups of hundreds of thousands of very old stars Open cluster - contain less than a few hundred members, and are often very young - may eventually become disrupted over time and no longer gravitational bound – move in broadly same direction in space – referred to as ste ...
... Globular cluster – tight groups of hundreds of thousands of very old stars Open cluster - contain less than a few hundred members, and are often very young - may eventually become disrupted over time and no longer gravitational bound – move in broadly same direction in space – referred to as ste ...
About SDSS - Astro Projects
... With the aid of telescopes, however, we are able to see a lot more than just fainter stars. We can detect the remains of stars that have run out of hydrogen fuel and died – so called 'planetary nebulae' and 'supernova remnants'. We can also see 'globular clusters', collections of 100 000 or so stars ...
... With the aid of telescopes, however, we are able to see a lot more than just fainter stars. We can detect the remains of stars that have run out of hydrogen fuel and died – so called 'planetary nebulae' and 'supernova remnants'. We can also see 'globular clusters', collections of 100 000 or so stars ...
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.