The Galaxies
... decades-old problems have been solved by Hubble and WMAP. ► However, many fundamental questions such as the nature of dark mater and dark energy remain unanswered. It is likely that significant progress will be made in our lifetime, so keep an eye out for new breakthroughs in the years ...
... decades-old problems have been solved by Hubble and WMAP. ► However, many fundamental questions such as the nature of dark mater and dark energy remain unanswered. It is likely that significant progress will be made in our lifetime, so keep an eye out for new breakthroughs in the years ...
DTU_9e_ch15
... the distribution of hydrogen gas in a face-on view of the Galaxy. This view just hints at spiral structure. The galactic nucleus is marked with a dot surrounded by a circle. Details in the large, blank, wedge-shaped region toward the upper left of the map are unknown, because gas in this part of the ...
... the distribution of hydrogen gas in a face-on view of the Galaxy. This view just hints at spiral structure. The galactic nucleus is marked with a dot surrounded by a circle. Details in the large, blank, wedge-shaped region toward the upper left of the map are unknown, because gas in this part of the ...
M13 – The Great Hercules Cluster
... southwest of M13’s core which is supposed to form a cross. I have looked for this little asterism but so far have not been able to identify it. If anyone out there can describe it better and tell me how to find it I would be grateful. Lastly, check out the nearby 11th magnitude spiral galaxy NGC 620 ...
... southwest of M13’s core which is supposed to form a cross. I have looked for this little asterism but so far have not been able to identify it. If anyone out there can describe it better and tell me how to find it I would be grateful. Lastly, check out the nearby 11th magnitude spiral galaxy NGC 620 ...
Chapter 16 - Astronomy
... 2. Harlow Shapley estimated a large size of our Galaxy, and concluded that the Magellanic Clouds, the Andromeda nebula, and other spiral nebulae were also part of it. 3. Heber Curtis estimated the Galaxy to be smaller and that the Andromeda nebula and other spiral nebulae are outside and are other “ ...
... 2. Harlow Shapley estimated a large size of our Galaxy, and concluded that the Magellanic Clouds, the Andromeda nebula, and other spiral nebulae were also part of it. 3. Heber Curtis estimated the Galaxy to be smaller and that the Andromeda nebula and other spiral nebulae are outside and are other “ ...
Groups of Stars
... amounts of gas and dust to form new stars. They are spherical and have a dense concentration of stars in the center. Can contain more than a million stars. Usually do not have short-lived blue stars because these stars have already died out. Astronomers estimate that the oldest globular clust ...
... amounts of gas and dust to form new stars. They are spherical and have a dense concentration of stars in the center. Can contain more than a million stars. Usually do not have short-lived blue stars because these stars have already died out. Astronomers estimate that the oldest globular clust ...
Irregular Galaxies
... 3) Irregular Galaxies- galaxies that don’t fit into the other classes. a) Many of these galaxies may have their shape distorted by neighboring galaxies’ gravity. ...
... 3) Irregular Galaxies- galaxies that don’t fit into the other classes. a) Many of these galaxies may have their shape distorted by neighboring galaxies’ gravity. ...
Lecture 17, PPT version
... Contents of the bulge: high density of gas and stars, old and young stars Active region of star formation (but can’t see at all well with visible light because of dust obscuration) ...
... Contents of the bulge: high density of gas and stars, old and young stars Active region of star formation (but can’t see at all well with visible light because of dust obscuration) ...
Cartwheel Galaxy - Chandra X
... Galaxy was probably a normal spiral structure galaxy similar to the Milky Way Galaxy before the collision. The spiral structure is beginning to re-emerge, as seen in the faint arms or spokes between the outer ring and the bulls-eye shaped nucleus. The gravitational disruption of a smaller intruder g ...
... Galaxy was probably a normal spiral structure galaxy similar to the Milky Way Galaxy before the collision. The spiral structure is beginning to re-emerge, as seen in the faint arms or spokes between the outer ring and the bulls-eye shaped nucleus. The gravitational disruption of a smaller intruder g ...
PROBLEM SET #9 SOLUTIONS AST142 1. Quasar luminosity
... is accreting at the Eddington rate, and show that these two findings are consistent with one another. ...
... is accreting at the Eddington rate, and show that these two findings are consistent with one another. ...
PH607 – Galaxies
... 1920: Nebulae:- The Shapley-Curtis Debate 1845 William Parsons, Earl of Rosse, using a 72-inch home constructed telescope in Ireland with a metal mirror (size unsurpassed until the 100-inch Mount Wilson telescope in 1917) He discovers the "Spiral Nebulae" (Messier 51), speculates that they may be K ...
... 1920: Nebulae:- The Shapley-Curtis Debate 1845 William Parsons, Earl of Rosse, using a 72-inch home constructed telescope in Ireland with a metal mirror (size unsurpassed until the 100-inch Mount Wilson telescope in 1917) He discovers the "Spiral Nebulae" (Messier 51), speculates that they may be K ...
Answer to question 1 - Northwestern University
... Type II’s are also called WW Virginis stars are found in old star clusters called Globular clusters ...
... Type II’s are also called WW Virginis stars are found in old star clusters called Globular clusters ...
8and10Dec_2014
... • Spirals are labeled Sa – Sd – Sa galaxies have tightly wound arms and a large central bulge – Sd galaxies are loosely wound and have a small central bulge ...
... • Spirals are labeled Sa – Sd – Sa galaxies have tightly wound arms and a large central bulge – Sd galaxies are loosely wound and have a small central bulge ...
Irregular galaxies
... largest measured distance is from the Sun to Saturn at about 1 billion miles (886 million miles is actual distance). ...
... largest measured distance is from the Sun to Saturn at about 1 billion miles (886 million miles is actual distance). ...
Chapter 16
... orbit around the center became globular clusters. 3. The initial cloud had some rotation, and as it contracted it spun faster. The rotating matter formed into a disk. 4. Density waves formed in the Galaxy’s disk, creating the spiral arms where star formation continues today. 5. In an alternative mod ...
... orbit around the center became globular clusters. 3. The initial cloud had some rotation, and as it contracted it spun faster. The rotating matter formed into a disk. 4. Density waves formed in the Galaxy’s disk, creating the spiral arms where star formation continues today. 5. In an alternative mod ...
Andromeda Galaxy
.jpg?width=300)
The Andromeda Galaxy (/ænˈdrɒmɨdə/), also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth. It is the nearest major galaxy to the Milky Way and was often referred to as the Great Andromeda Nebula in older texts. It received its name from the area of the sky in which it appears, the constellation of Andromeda, which was named after the mythological princess Andromeda. Being approximately 220,000 light years across, it is the largest galaxy of the Local Group, which also contains the Milky Way, the Triangulum Galaxy, and about 44 other smaller galaxies.The Andromeda Galaxy is the most massive galaxy in the Local Group as well. Despite earlier findings that suggested that the Milky Way contains more dark matter and could be the most massive in the grouping, the 2006 observations by the Spitzer Space Telescope revealed that Andromeda contains one trillion (1012) stars: at least twice the number of stars in the Milky Way, which is estimated to be 200–400 billion.The Andromeda Galaxy is estimated to be 1.5×1012 solar masses, while the mass of the Milky Way is estimated to be 8.5×1011 solar masses. In comparison, a 2009 study estimated that the Milky Way and M31 are about equal in mass, while a 2006 study put the mass of the Milky Way at ~80% of the mass of the Andromeda Galaxy. The Milky Way and Andromeda are expected to collide in 3.75 billion years, eventually merging to form a giant elliptical galaxy or perhaps a large disk galaxy.At 3.4, the apparent magnitude of the Andromeda Galaxy is one of the brightest of any of the Messier objects, making it visible to the naked eye on moonless nights even when viewed from areas with moderate light pollution. Although it appears more than six times as wide as the full Moon when photographed through a larger telescope, only the brighter central region is visible to the naked eye or when viewed using binoculars or a small telescope and would it hence appear to be but another star.