chapter19 - Empyrean Quest Publishers
... our view because they absorb visible light This is the interstellar medium that makes new star systems ...
... our view because they absorb visible light This is the interstellar medium that makes new star systems ...
Chapter 19 Our Galaxy What does our galaxy look like?
... • The orbital speed (v) and radius (r) of an object on a circular orbit around the galaxy tells us the mass (Mr) within that orbit ...
... • The orbital speed (v) and radius (r) of an object on a circular orbit around the galaxy tells us the mass (Mr) within that orbit ...
DTU 8e Chap 17 Quasars and Other Active Galaxies
... An active galaxy is an extremely luminous galaxy that has one or more unusual features: an unusually bright, starlike nucleus; strong emission lines in its spectrum; rapid variations in luminosity; and jets or beams of radiation that emanate from its core. Active galaxies include quasars, Seyfert ga ...
... An active galaxy is an extremely luminous galaxy that has one or more unusual features: an unusually bright, starlike nucleus; strong emission lines in its spectrum; rapid variations in luminosity; and jets or beams of radiation that emanate from its core. Active galaxies include quasars, Seyfert ga ...
Virgo constellation
... about 5,900.There is strong evidence for a stellar mass black hole through observations made over a span of a few years. M49 was the first member of the Virgo clusters discovered. RA12h 29m 46.7s . DEC+08° 00′ 02″. (wikipedia.com) Then we have the M58 it was discovered in 1779 which is a barred spir ...
... about 5,900.There is strong evidence for a stellar mass black hole through observations made over a span of a few years. M49 was the first member of the Virgo clusters discovered. RA12h 29m 46.7s . DEC+08° 00′ 02″. (wikipedia.com) Then we have the M58 it was discovered in 1779 which is a barred spir ...
Document
... • Stars form in the condensed material • Stars very often form in groups (called star clusters) • Stars vary in mass from much less than the Sun to more than 100 x Sun NGC 3603 ...
... • Stars form in the condensed material • Stars very often form in groups (called star clusters) • Stars vary in mass from much less than the Sun to more than 100 x Sun NGC 3603 ...
Summary Of the Structure of the Milky Way
... This all sky map displays the locations of about 150 globular clusters in the Milky Way. These clusters are more luminous than open clusters because they typically contain 500,000 stars many of which are red giants. Also, they are not (generally) buried in the dust of the Milky Way's disk, but are ...
... This all sky map displays the locations of about 150 globular clusters in the Milky Way. These clusters are more luminous than open clusters because they typically contain 500,000 stars many of which are red giants. Also, they are not (generally) buried in the dust of the Milky Way's disk, but are ...
Student Reading
... Irregular Galaxies (“Irr”) An irregular galaxy is neither a spiral nor an elliptical. Irregular galaxies tend to be smaller objects without definite shape, and they typically have very hot newer stars mixed in with lots of gas and dust. These galaxies often have active regions of star formation. Som ...
... Irregular Galaxies (“Irr”) An irregular galaxy is neither a spiral nor an elliptical. Irregular galaxies tend to be smaller objects without definite shape, and they typically have very hot newer stars mixed in with lots of gas and dust. These galaxies often have active regions of star formation. Som ...
Microsoft Word 97
... only about 10 light-years across. 2) The Disk – The part of the pancake outside the bulge is called the galactic disk. It extends 45,000 light-years or so out from the center of the galaxy. The Sun is located about one-half to two-thirds of the way out. This disk is very this – 2 per cent of its wid ...
... only about 10 light-years across. 2) The Disk – The part of the pancake outside the bulge is called the galactic disk. It extends 45,000 light-years or so out from the center of the galaxy. The Sun is located about one-half to two-thirds of the way out. This disk is very this – 2 per cent of its wid ...
Galaxies and Their Properties
... bivariate scaling relations (derive one from 2 others), called the Fundamental Plane, commonly expressed as a bivariate scaling relation R ~ σ 1.4 I –0.8 , where R is the radius, I the mean surface brightness, σ the velocity dispersion ...
... bivariate scaling relations (derive one from 2 others), called the Fundamental Plane, commonly expressed as a bivariate scaling relation R ~ σ 1.4 I –0.8 , where R is the radius, I the mean surface brightness, σ the velocity dispersion ...
Powerpoint slides
... Astronomers assume that most, if not all, spiral galaxies look pretty much the same. Therefore, this smaller-looking galaxy is probably a more distant galaxy. It is about five times as small as the larger-looking galaxy, so it is probably about five times farther…about two third of a mile away, on t ...
... Astronomers assume that most, if not all, spiral galaxies look pretty much the same. Therefore, this smaller-looking galaxy is probably a more distant galaxy. It is about five times as small as the larger-looking galaxy, so it is probably about five times farther…about two third of a mile away, on t ...
Lecture 18, Structure of spiral galaxies
... • fraction of heavy elements same as or greater than the Sun • plenty of high and lowmass stars, blue and red • Stars in the halo are old. • fraction of heavy elements much less than the Sun • mostly lowmass, red stars • Stars in the halo must have formed early in the Milky Way Galaxy’s history ...
... • fraction of heavy elements same as or greater than the Sun • plenty of high and lowmass stars, blue and red • Stars in the halo are old. • fraction of heavy elements much less than the Sun • mostly lowmass, red stars • Stars in the halo must have formed early in the Milky Way Galaxy’s history ...
The Night Sky This Month - Usk Astronomical Society
... Jupiter reappears again in the morning twilight in the middle of the month. On the 11 th Jupiter approaches within 1° of Mercury as they both rise steeply in the morning twilight. I feel this may very well be too dangerous to observe. Saturn is in Ophiuchus throughout October and appears low in the ...
... Jupiter reappears again in the morning twilight in the middle of the month. On the 11 th Jupiter approaches within 1° of Mercury as they both rise steeply in the morning twilight. I feel this may very well be too dangerous to observe. Saturn is in Ophiuchus throughout October and appears low in the ...
Lecture 5
... In 1917, Heber Curtis had observed the nova S Andromedae within the "Great Andromeda Nebula" (Messier object M31). Searching the photographic record, he found 11 more novae. Curtis noticed that these novae were, on average, 10 magnitudes fainter than those that occurred within our galaxy. As a resu ...
... In 1917, Heber Curtis had observed the nova S Andromedae within the "Great Andromeda Nebula" (Messier object M31). Searching the photographic record, he found 11 more novae. Curtis noticed that these novae were, on average, 10 magnitudes fainter than those that occurred within our galaxy. As a resu ...
Galaxies - SD43 Teacher Sites
... thinking. While observing what he thought was just a bright nebula, a cloud of gas and dust, Hubble realized that in fact he was looking into an enormous collection of individual stars. He had identified another galaxy, the one now named Andromeda. It is our nearest neighbouring galaxy. Astronomers ...
... thinking. While observing what he thought was just a bright nebula, a cloud of gas and dust, Hubble realized that in fact he was looking into an enormous collection of individual stars. He had identified another galaxy, the one now named Andromeda. It is our nearest neighbouring galaxy. Astronomers ...
Andromeda Galaxy
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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.