The Inverse Square Law and Surface Area
... stars and classify their power output and compare them with more distant stars The following very bright objects of known luminosity can be identified in distant galaxies • Cepheid Variable Stars ...
... stars and classify their power output and compare them with more distant stars The following very bright objects of known luminosity can be identified in distant galaxies • Cepheid Variable Stars ...
Lecture 10: The Milky Way
... We live in a galaxy that has three major components of different ages and metallicities. Disc (thin+thick) – about 25kpc in radius, only about 1kpc thick. Most of the stars are young (0-8 Gyr), and have about the same metal content as the Sun. Total stellar mass of about 6x1010M. Bulge – a mostly o ...
... We live in a galaxy that has three major components of different ages and metallicities. Disc (thin+thick) – about 25kpc in radius, only about 1kpc thick. Most of the stars are young (0-8 Gyr), and have about the same metal content as the Sun. Total stellar mass of about 6x1010M. Bulge – a mostly o ...
Astronomy Review
... 1. Everything we know to exist including matter, energy, space, and time is known as the Universe ________________. ...
... 1. Everything we know to exist including matter, energy, space, and time is known as the Universe ________________. ...
Ch. 11 and 12 Study Guide (ANSWERS)
... and become hotter. As the clump contracts even more, it begins to take the shape of a sphere and gets even hotter. That spherical mass begins to spin and become a disk, which is hottest at its center. Then, the temperature becomes so hot in the center that nuclear fusion begins to occur and object b ...
... and become hotter. As the clump contracts even more, it begins to take the shape of a sphere and gets even hotter. That spherical mass begins to spin and become a disk, which is hottest at its center. Then, the temperature becomes so hot in the center that nuclear fusion begins to occur and object b ...
Universal redshift, the Hubble constant The cosmic background
... the atoms were formed and the medium become transparent decoupled photons allow gravitational collapse and creation of galaxies photons scattered for the last time and continue expanding destiny of some of the photons was to be measured by us One can see it easier – since λM ∼ 1/T , TD/TC = LC /LD C ...
... the atoms were formed and the medium become transparent decoupled photons allow gravitational collapse and creation of galaxies photons scattered for the last time and continue expanding destiny of some of the photons was to be measured by us One can see it easier – since λM ∼ 1/T , TD/TC = LC /LD C ...
Lecture 1: The Scale of the Cosmos - Ohio
... Earth orbiting around the Sun In order to avoid large numbers beyond our imagination, we introduce new units: 1 Astronomical Unit (AU) = Distance Sun – Earth = 150 million km ...
... Earth orbiting around the Sun In order to avoid large numbers beyond our imagination, we introduce new units: 1 Astronomical Unit (AU) = Distance Sun – Earth = 150 million km ...
Stellar Magnitudes and Distances
... • Chickens have their eyes on different sides of their heads. They only see an object with 1 eye at a time. They don’t have binocular vision like we do, that is good for measuring distance. • How then do they grab a grain of corn without slamming their heads into the dirt? ...
... • Chickens have their eyes on different sides of their heads. They only see an object with 1 eye at a time. They don’t have binocular vision like we do, that is good for measuring distance. • How then do they grab a grain of corn without slamming their heads into the dirt? ...
7a Properties of Stars.pptx
... • Luminosity is the measure of the energy output from the surface of a star per second. • This is based on the star’s apparent magnitude and how far away it is. • Sun = 3.85x1026 Wa?s = 3. ...
... • Luminosity is the measure of the energy output from the surface of a star per second. • This is based on the star’s apparent magnitude and how far away it is. • Sun = 3.85x1026 Wa?s = 3. ...
14_MilkyWay_advanced_2014may
... distances, because did not know about absorption of light by galactic dust ...
... distances, because did not know about absorption of light by galactic dust ...
Star Types - University of Massachusetts Amherst
... the magnitude you would observe, were the source placed at 10 pc m – M = -5 + 5 x Log (d) ...
... the magnitude you would observe, were the source placed at 10 pc m – M = -5 + 5 x Log (d) ...
An Introduction To Parallax
... Introduction —Parallax is a geometrical effect that can be used to obtain a direct measurement of the distance to an object. A driver and her passenger, for example, may fall prey to this effect when arguing about a car’s speed. If the car uses a needle–type speedometer, where the needle is mounted ...
... Introduction —Parallax is a geometrical effect that can be used to obtain a direct measurement of the distance to an object. A driver and her passenger, for example, may fall prey to this effect when arguing about a car’s speed. If the car uses a needle–type speedometer, where the needle is mounted ...
here
... – Gamma rays, X rays, UV, visible, IR, Microwave, Radio. – Photons: particles of light. Wavelength of a photon increases as its energy goes up. – A blackbody radiator is a body that absorbs all radiation falling on it and re-radiates such that the spectrum of the radiation has a specific form that d ...
... – Gamma rays, X rays, UV, visible, IR, Microwave, Radio. – Photons: particles of light. Wavelength of a photon increases as its energy goes up. – A blackbody radiator is a body that absorbs all radiation falling on it and re-radiates such that the spectrum of the radiation has a specific form that d ...
Consider Average Stars
... The apparent brightness of a star – that is, what we actually see – is partly an accident of location: nearby stars can look deceptively bright. (The obvious example is the Sun!) But the intrinsic (true) brightness of a star is a good measure of how much energy is being generated, how fast the fuel ...
... The apparent brightness of a star – that is, what we actually see – is partly an accident of location: nearby stars can look deceptively bright. (The obvious example is the Sun!) But the intrinsic (true) brightness of a star is a good measure of how much energy is being generated, how fast the fuel ...
Photometry
... – Zero for main sequence stars at 6500 K • Luminosity is directly related to absolute bolometric magnitude. – Flux to apparent bolometric magnitude ...
... – Zero for main sequence stars at 6500 K • Luminosity is directly related to absolute bolometric magnitude. – Flux to apparent bolometric magnitude ...
Math Primer - UMass Amherst
... 1. The Sun would hold 1.3 million Earths. i.e. the radius of the Sun is about 100 times that of the Earth. 2. There are ~100 billion "Suns" in a galaxy like our own Milky Way Galaxy. 3.Astronomers can see billions of galaxies. ...
... 1. The Sun would hold 1.3 million Earths. i.e. the radius of the Sun is about 100 times that of the Earth. 2. There are ~100 billion "Suns" in a galaxy like our own Milky Way Galaxy. 3.Astronomers can see billions of galaxies. ...
Space Science Unit
... star and the absolute magnitude (brightness) of the star to help astronomers decide which phase of the star’s life cycle the star is in and other important information about the star. • Most stars are what we consider main sequence (including our sun). They make up 90% of the stars in our sky. These ...
... star and the absolute magnitude (brightness) of the star to help astronomers decide which phase of the star’s life cycle the star is in and other important information about the star. • Most stars are what we consider main sequence (including our sun). They make up 90% of the stars in our sky. These ...
Week 2 (9/27) – Opinion Poll I am taking this class because:
... A. There are eight planets in our Solar System ...
... A. There are eight planets in our Solar System ...
Unit 3 - Section 9.1 2011 Distances in Space
... direction that C appears from two ends of a baseline AB (see illustration). The problem is simplified by three ideas. 1. The baseline is perpendicular (i.e., 90O) to a line draw from the middle of AB to point C. Thus, the triangle ABC is symmetric. If we call the drawn line r, then AC = BC = r 2. Th ...
... direction that C appears from two ends of a baseline AB (see illustration). The problem is simplified by three ideas. 1. The baseline is perpendicular (i.e., 90O) to a line draw from the middle of AB to point C. Thus, the triangle ABC is symmetric. If we call the drawn line r, then AC = BC = r 2. Th ...
Grade 9 Academic Science – Unit 3 Space
... direction that C appears from two ends of a baseline AB (see illustration). The problem is simplified by three ideas. 1. The baseline is perpendicular (i.e., 90O) to a line draw from the middle of AB to point C. Thus, the triangle ABC is symmetric. If we call the drawn line r, then AC = BC = r 2. Th ...
... direction that C appears from two ends of a baseline AB (see illustration). The problem is simplified by three ideas. 1. The baseline is perpendicular (i.e., 90O) to a line draw from the middle of AB to point C. Thus, the triangle ABC is symmetric. If we call the drawn line r, then AC = BC = r 2. Th ...
9/28/16 Wednesday Parallax Lab
... Now, have your lab partner move the pen twice the original distance to you, to approximately the end of the meter stick. When you alternate opening and closing each eye does the pen appear to move more or less than before? Try to quantify how much more or less (twice as much? half as much? three tim ...
... Now, have your lab partner move the pen twice the original distance to you, to approximately the end of the meter stick. When you alternate opening and closing each eye does the pen appear to move more or less than before? Try to quantify how much more or less (twice as much? half as much? three tim ...
Nov 2017 - What`s Out Tonight?
... tens of thousands stars held together by their mutual gravity. All Galilean moons and cloud bands, easily visible at 50x. It is posof the globulars that can be seen in the sky are part of our Milky sible to see the moons with well-focused binoculars. Saturn is Way Galaxy, and there are about 200 of ...
... tens of thousands stars held together by their mutual gravity. All Galilean moons and cloud bands, easily visible at 50x. It is posof the globulars that can be seen in the sky are part of our Milky sible to see the moons with well-focused binoculars. Saturn is Way Galaxy, and there are about 200 of ...
Allison McGraw - WordPress.com
... Scintillation: The twinkling of star light is a beautiful effect of the Earth's atmosphere. As light passes through our atmosphere, its path is deviated (refracted) multiple times before reaching the ground. Stars that are near to the horizon will scintillate much more than stars high overhead since ...
... Scintillation: The twinkling of star light is a beautiful effect of the Earth's atmosphere. As light passes through our atmosphere, its path is deviated (refracted) multiple times before reaching the ground. Stars that are near to the horizon will scintillate much more than stars high overhead since ...
astrocoursespring2012lec4
... In cosmological redshift, the wavelength at which the radiation is originally emitted is (only) lengthened as it travels through (expanding) space. A Cosmological redshift results from the expansion of space itself and not from the motion of the object. So the recessional velocity is not the galaxie ...
... In cosmological redshift, the wavelength at which the radiation is originally emitted is (only) lengthened as it travels through (expanding) space. A Cosmological redshift results from the expansion of space itself and not from the motion of the object. So the recessional velocity is not the galaxie ...
Locating Objects in Space
... Main sequence: much shorter than for smaller stars, more fuel but consumed at a faster rate Red Supergiant: larger and more luminous Supernova: star that blows off its outer shell into interstellar space, luminosity soars & may outshine entire galaxy ...
... Main sequence: much shorter than for smaller stars, more fuel but consumed at a faster rate Red Supergiant: larger and more luminous Supernova: star that blows off its outer shell into interstellar space, luminosity soars & may outshine entire galaxy ...
Lecture 19 The Milky Way Galaxy
... - Long spiral patterns of bright stars, HII regions, star clusters, gas and dust - Sun is located on inner edge of one ...
... - Long spiral patterns of bright stars, HII regions, star clusters, gas and dust - Sun is located on inner edge of one ...
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.