galaxies
... • has about 200 billion stars, and lots of gas and dust • is a barred-spiral (we think) • about 100,000 light-years wide • our Sun is halfway to the edge, revolving at half a million miles per hour around the center of the Galaxy • takes our Solar System about 200 million years to revolve once aroun ...
... • has about 200 billion stars, and lots of gas and dust • is a barred-spiral (we think) • about 100,000 light-years wide • our Sun is halfway to the edge, revolving at half a million miles per hour around the center of the Galaxy • takes our Solar System about 200 million years to revolve once aroun ...
Milky Way
... • What causes the mass to keep on increasing? • Don’t see anything there. Thus “dark” matter. ...
... • What causes the mass to keep on increasing? • Don’t see anything there. Thus “dark” matter. ...
Galaxies Quiz – Study Guide KEY You will be given a set of images
... 16. Old galaxies are __YELLOW___ (what color?) and contain (a little or a lot) of dust. 17. Compare open and globular star clusters: Which are bigger? __GLOBULAR__Which contain mostly young stars? _____OPEN__ Which are found in the arms of spiral galaxies? ____OPEN In the Halo? ___GLOBULAR___ 18. Wh ...
... 16. Old galaxies are __YELLOW___ (what color?) and contain (a little or a lot) of dust. 17. Compare open and globular star clusters: Which are bigger? __GLOBULAR__Which contain mostly young stars? _____OPEN__ Which are found in the arms of spiral galaxies? ____OPEN In the Halo? ___GLOBULAR___ 18. Wh ...
Sky News – March 2015 The Realm of the Galaxies
... west with the onset of darkness, bringing the spring constellations of Leo, Virgo, Coma Bernices and Ursa Major into prominence. It is within these that hosts of galaxies reside. The North Galactic Pole, the point in the sky directly over the centre of our galaxy, is in the constellation Coma Bernic ...
... west with the onset of darkness, bringing the spring constellations of Leo, Virgo, Coma Bernices and Ursa Major into prominence. It is within these that hosts of galaxies reside. The North Galactic Pole, the point in the sky directly over the centre of our galaxy, is in the constellation Coma Bernic ...
633 infrared, ultraviolet, x-ray, and gamma
... highly active galactic nuclei, burning so brightly that they blot out all the light from the galaxies’ stars. A blazar is believed to be an active galaxy that has one of its jets pointed toward Earth, so that observers here on Earth are looking directly into the jet of escaping energy. Lower-luminos ...
... highly active galactic nuclei, burning so brightly that they blot out all the light from the galaxies’ stars. A blazar is believed to be an active galaxy that has one of its jets pointed toward Earth, so that observers here on Earth are looking directly into the jet of escaping energy. Lower-luminos ...
The extragalactic universe and distance measurements
... – Tried to determine distribution of stars in Milky Way – described Milky Way as “detached nebula”, with Sun near center. – Thought that the nebulae could be similar systems – Turns out that his conclusions were heavily effected by dust in the Milky Way – Milky Way is much bigger and better ordered ...
... – Tried to determine distribution of stars in Milky Way – described Milky Way as “detached nebula”, with Sun near center. – Thought that the nebulae could be similar systems – Turns out that his conclusions were heavily effected by dust in the Milky Way – Milky Way is much bigger and better ordered ...
Colonization of the Milky Way The distances between the stars are
... than ten billion years, so does the time or the distance win? An easy way to see that the time is triumphant is to note that a speed of 30 km/s, comparable to the fastest spacecraft our still-young civilization has launched, is about 1/10,000 times the speed of light. Our galaxy is about 100,000 lig ...
... than ten billion years, so does the time or the distance win? An easy way to see that the time is triumphant is to note that a speed of 30 km/s, comparable to the fastest spacecraft our still-young civilization has launched, is about 1/10,000 times the speed of light. Our galaxy is about 100,000 lig ...
combined astro show 2013
... The temperature of the gas, generally the spectral lines of various elements become more prominent at certain temperatures ...
... The temperature of the gas, generally the spectral lines of various elements become more prominent at certain temperatures ...
Goals of the day Clickers Order of Magnitude Astronomy
... • Local group = several million light-years =106 ly • Observable universe = 14 billion light-years = 1.4 x 1010 ly ...
... • Local group = several million light-years =106 ly • Observable universe = 14 billion light-years = 1.4 x 1010 ly ...
Integrative Studies 410 Our Place in the Universe
... Universe • measure distances to other galaxies using the periodluminosity relationship for Cepheid variables • Type I supernovae also used to measure distances – Predictable luminosity – a standard candle ...
... Universe • measure distances to other galaxies using the periodluminosity relationship for Cepheid variables • Type I supernovae also used to measure distances – Predictable luminosity – a standard candle ...
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.