Black Genesis: The Prehistoric Origins of Ancient Egypt
... Egyptology has become accustomed, but whatever the cause, this issue has remained largely unresolved. We first came across this inherent bias and prejudice against African origins of the Egyptian civilization in the debate—more of an auto-dafé really—against the Black African professor Cheikh Anta D ...
... Egyptology has become accustomed, but whatever the cause, this issue has remained largely unresolved. We first came across this inherent bias and prejudice against African origins of the Egyptian civilization in the debate—more of an auto-dafé really—against the Black African professor Cheikh Anta D ...
Brightest Stars : Discovering the Universe Through the Sky`s Most
... the blue-white star Rigel, which the book had talked about, glittered through the trees and truly pierced my heart with its beauty and wonder. Only I didn’t know initially that it was Rigel. It was so splendid I thought it must be Sirius, the blue-white brightest-of-all star that the book had also t ...
... the blue-white star Rigel, which the book had talked about, glittered through the trees and truly pierced my heart with its beauty and wonder. Only I didn’t know initially that it was Rigel. It was so splendid I thought it must be Sirius, the blue-white brightest-of-all star that the book had also t ...
b. - UW Canvas
... Post-18.1: This graph shows the functional form of the dependence of the parallax angle on the distance an object is from Earth. If the minimum parallax angle we could measure were 0.5 arcsec, what is the maximum distance of a star that we could measure? ...
... Post-18.1: This graph shows the functional form of the dependence of the parallax angle on the distance an object is from Earth. If the minimum parallax angle we could measure were 0.5 arcsec, what is the maximum distance of a star that we could measure? ...
Today in Astronomy 102: electron degeneracy pressure and white
... They orbit each other with a period of about 50 years. Sirius A is vastly brighter than Sirius B at visible wavelengths; the contrast is smaller in this X-ray image. Astronomy 102 ...
... They orbit each other with a period of about 50 years. Sirius A is vastly brighter than Sirius B at visible wavelengths; the contrast is smaller in this X-ray image. Astronomy 102 ...
Astronomy 102, Spring 2003 Solutions to Review Problems
... Solutions to Review Problems from 2003 February 12 1. Chapter 12, Question 1 in the text: To know certain properties of a star, you must first determine the star’s distance. For other properties, knowledge of distance is not necessary. Into which category would you place each of the following proper ...
... Solutions to Review Problems from 2003 February 12 1. Chapter 12, Question 1 in the text: To know certain properties of a star, you must first determine the star’s distance. For other properties, knowledge of distance is not necessary. Into which category would you place each of the following proper ...
Lab #10 (Apr 10-13)
... travel across the Earth from one observation point to another, and in that time, the planet would inevitably move on its own against the starry background, making the parallax measurement impossible.! ...
... travel across the Earth from one observation point to another, and in that time, the planet would inevitably move on its own against the starry background, making the parallax measurement impossible.! ...
Images from the Las Cumbres Observatory Global Telescope
... Sirius, also known as the Dog Star, is the brightest star in the sky and the 5th nearest star system to the Sun. Sirius is a binary star with an apparent visual mag. of -1.42. It is only 8.6 LY distant. The brighter component, Sirius A, is a white main sequence star and the companion, Sirius B, is a ...
... Sirius, also known as the Dog Star, is the brightest star in the sky and the 5th nearest star system to the Sun. Sirius is a binary star with an apparent visual mag. of -1.42. It is only 8.6 LY distant. The brighter component, Sirius A, is a white main sequence star and the companion, Sirius B, is a ...
1705 Star Charts
... Two bright planets and the brightest stars share the evening sky this May. Soon after sunset golden Jupiter appears in the northeast. Beside Jupiter is Spica, the brightest star in Virgo. Below Jupiter, near the horizon, is orange Arcturus, the brightest star in the northern sky. As the sky darkens ...
... Two bright planets and the brightest stars share the evening sky this May. Soon after sunset golden Jupiter appears in the northeast. Beside Jupiter is Spica, the brightest star in Virgo. Below Jupiter, near the horizon, is orange Arcturus, the brightest star in the northern sky. As the sky darkens ...
Page 325 - ClassZone
... A light year is the distance light travels in a year. One light year is about 6,000,000,000,000 miles. The star Sirius is about 8.8 light years from Earth. Write an inequality that describes distances to points in space that are farther from Earth than Sirius is. Then graph the inequality. ASTRONOMY ...
... A light year is the distance light travels in a year. One light year is about 6,000,000,000,000 miles. The star Sirius is about 8.8 light years from Earth. Write an inequality that describes distances to points in space that are farther from Earth than Sirius is. Then graph the inequality. ASTRONOMY ...
Astronomy of the Pyramids
... day/night when they rise and set changes, the location along the horizon (when seen from a set viewing location) does not change. This is why they would have used a star, rather than the Sun, to mark the artificial horizon. Does precession play a part in this alignment of the pyramids? Precession wo ...
... day/night when they rise and set changes, the location along the horizon (when seen from a set viewing location) does not change. This is why they would have used a star, rather than the Sun, to mark the artificial horizon. Does precession play a part in this alignment of the pyramids? Precession wo ...
Star in a Box
... In fact, most stars can be found somewhere along a line in this graph. Some stars are much cooler and less luminous, such calledstar the to “Main Sequence”. asThis the isclosest the Sun, Proxima Centauri. Where would you plot these? ...
... In fact, most stars can be found somewhere along a line in this graph. Some stars are much cooler and less luminous, such calledstar the to “Main Sequence”. asThis the isclosest the Sun, Proxima Centauri. Where would you plot these? ...
C:\Documents and Settings\Administrator\Desktop\Lecture 15.wpd
... or absolute magnitude. In the figure below, Sirius has a bolometric apparent magnitude of m = -1.4 (the brightest star in the sky other than the Sun has a visual magnitude of 1), and from parallax measurements d = 2.7 parsecs away. Finding this point on the plot and extrapolating over we find that S ...
... or absolute magnitude. In the figure below, Sirius has a bolometric apparent magnitude of m = -1.4 (the brightest star in the sky other than the Sun has a visual magnitude of 1), and from parallax measurements d = 2.7 parsecs away. Finding this point on the plot and extrapolating over we find that S ...
Earth in Space and Time (SC.5.E.5.1)
... Which of the following explains why Sirius can be seen without a telescope? A. Barnard's star is much larger and hotter than Sirius. B. Sirius is much larger and hotter than Barnard's star. C. All stars are the same size, so Sirius must be hotter than Barnard's star. D. All stars are the same temper ...
... Which of the following explains why Sirius can be seen without a telescope? A. Barnard's star is much larger and hotter than Sirius. B. Sirius is much larger and hotter than Barnard's star. C. All stars are the same size, so Sirius must be hotter than Barnard's star. D. All stars are the same temper ...
v A v A
... = 0.0093 x 1.496 x 108 km = 1.392 x 106 km or Rsun = 6.96 x 105 km Can we apply same principles to the stars? e.g. Cen (like Sun) D = 1.3 pc = 2.7 x 105 AU; if Rcen = Rsun = 2Rsun/D = 0.0093 AU/2.7 x 105 AU = 3.3 x 10-8 rad = 0.007 arcsec (angular diameter of a dime 150 km away!) Can we resolve ...
... = 0.0093 x 1.496 x 108 km = 1.392 x 106 km or Rsun = 6.96 x 105 km Can we apply same principles to the stars? e.g. Cen (like Sun) D = 1.3 pc = 2.7 x 105 AU; if Rcen = Rsun = 2Rsun/D = 0.0093 AU/2.7 x 105 AU = 3.3 x 10-8 rad = 0.007 arcsec (angular diameter of a dime 150 km away!) Can we resolve ...
white dwarf supernova
... However, Sirius A is not hot enough to radiate much in X-rays, so even a small star that is hot enough can outshine it in X-rays. ...
... However, Sirius A is not hot enough to radiate much in X-rays, so even a small star that is hot enough can outshine it in X-rays. ...
Photosphere
... times smaller. The same size as the Earth! Stars come in 3 sizes. Luminosity (Lsun) Î ...
... times smaller. The same size as the Earth! Stars come in 3 sizes. Luminosity (Lsun) Î ...
Hot-plate model of stars Test 2 & grades • Public viewing sessions
... • To find luminosity of a star, we need to measure its distance. (This is difficult.) ...
... • To find luminosity of a star, we need to measure its distance. (This is difficult.) ...
Astro 210 Lecture 4 Sept. 4, 2013 Announcements: • PS 1 available
... Q: what’s a blackbody? what objects emit BB radiation? Q: what sets surface flux from a BB? Q: how is BB color related to temperature? ...
... Q: what’s a blackbody? what objects emit BB radiation? Q: what sets surface flux from a BB? Q: how is BB color related to temperature? ...
3.1e Finding Polaris and Sirius
... have very dark skies, the Andromeda Galaxy is the furthest object that you can see with your naked eye – 2.4 million light years away! The galaxy appears as a small, white, fuzzy patch. When you have found the Great Square of Pegasus, you need to find the top left hand star of the square (the star d ...
... have very dark skies, the Andromeda Galaxy is the furthest object that you can see with your naked eye – 2.4 million light years away! The galaxy appears as a small, white, fuzzy patch. When you have found the Great Square of Pegasus, you need to find the top left hand star of the square (the star d ...
Constants and Equations
... a) AM CVn stars are binary systems with an orbital period of less than 65 minutes. b) AM CVn stars may produce a type II supernova after the white dwarf reaches a critical mass. c) AM CVn stars are sources of gravitational waves. d) AM CVn stars are binary systems where a white dwarf accretes mass f ...
... a) AM CVn stars are binary systems with an orbital period of less than 65 minutes. b) AM CVn stars may produce a type II supernova after the white dwarf reaches a critical mass. c) AM CVn stars are sources of gravitational waves. d) AM CVn stars are binary systems where a white dwarf accretes mass f ...
Read
... standard distance of 10 parsecs. A parsec (pc) is a unit of distance; 1 pc = 3.26 light years. Spectral type – Indicates the color of the star, which is related to its surface temperature. From the hottest to coolest, also from blue to red color, the types are: O, B, A, F, G, K, M. A second number i ...
... standard distance of 10 parsecs. A parsec (pc) is a unit of distance; 1 pc = 3.26 light years. Spectral type – Indicates the color of the star, which is related to its surface temperature. From the hottest to coolest, also from blue to red color, the types are: O, B, A, F, G, K, M. A second number i ...
Monday, April 15
... Finding the absolute Magnitude • To figure out absolute magnitude, we need to know the distance to the star • Then do the following Gedankenexperiment: – In your mind, put the star from its actual position to a position 10 pc away – If a star is actually closer than 10pc, its absolute magnitude wil ...
... Finding the absolute Magnitude • To figure out absolute magnitude, we need to know the distance to the star • Then do the following Gedankenexperiment: – In your mind, put the star from its actual position to a position 10 pc away – If a star is actually closer than 10pc, its absolute magnitude wil ...
Sirius
Sirius (/ˈsɪriəs/) is the brightest star (in fact, a star system) in the Earth's night sky. With a visual apparent magnitude of −1.46, it is almost twice as bright as Canopus, the next brightest star. The name ""Sirius"" is derived from the Ancient Greek Σείριος (Seirios), meaning ""glowing"" or ""scorcher"". The system has the Bayer designation Alpha Canis Majoris (α CMa). What the naked eye perceives as a single star is actually a binary star system, consisting of a white main-sequence star of spectral type A1V, termed Sirius A, and a faint white dwarf companion of spectral type DA2, called Sirius B. The distance separating Sirius A from its companion varies between 8.2 and 31.5 AU.Sirius appears bright because of both its intrinsic luminosity and its proximity to Earth. At a distance of 2.6 parsecs (8.6 ly), as determined by the Hipparcos astrometry satellite, the Sirius system is one of Earth's near neighbors. Sirius is gradually moving closer to the Solar System, so it will slightly increase in brightness over the next 60,000 years. After that time its distance will begin to increase, but it will continue to be the brightest star in the Earth's sky for the next 210,000 years.Sirius A is about twice as massive as the Sun (M☉) and has an absolute visual magnitude of 1.42. It is 25 times more luminous than the Sun but has a significantly lower luminosity than other bright stars such as Canopus or Rigel. The system is between 200 and 300 million years old. It was originally composed of two bright bluish stars. The more massive of these, Sirius B, consumed its resources and became a red giant before shedding its outer layers and collapsing into its current state as a white dwarf around 120 million years ago.Sirius is also known colloquially as the ""Dog Star"", reflecting its prominence in its constellation, Canis Major (Greater Dog). The heliacal rising of Sirius marked the flooding of the Nile in Ancient Egypt and the ""dog days"" of summer for the ancient Greeks, while to the Polynesians in the Southern Hemisphere the star marked winter and was an important reference for their navigation around the Pacific Ocean.