Origins of the Universe
... • Stars of a constellation are often far apart from each other, but they appear grouped together when viewed from Earth • One of the 88 sectors into which astronomers divide the sphere of the skynamed after a traditional constellation in that sector • Patterns of constellations are dynamic; therefor ...
... • Stars of a constellation are often far apart from each other, but they appear grouped together when viewed from Earth • One of the 88 sectors into which astronomers divide the sphere of the skynamed after a traditional constellation in that sector • Patterns of constellations are dynamic; therefor ...
Stars from Afar
... Brightness/Magnitude – The amount of light a star gives off depends on its size and temperature. ...
... Brightness/Magnitude – The amount of light a star gives off depends on its size and temperature. ...
1 Astronomical Measurements and Quantities 2 Astronomical Objects
... Galaxies: Morphological classification. Main properties: luminosity and size, colors, spectra. Luminosity function. Tully-Fisher and Faber-Jackson relations. Structure and surface brightness profiles. Dynamics: rotation velocity and pressure supported objects. Galaxy properties and environment: clus ...
... Galaxies: Morphological classification. Main properties: luminosity and size, colors, spectra. Luminosity function. Tully-Fisher and Faber-Jackson relations. Structure and surface brightness profiles. Dynamics: rotation velocity and pressure supported objects. Galaxy properties and environment: clus ...
LT 5: I can describe how astronomers determine the composition
... Nuclear fusion is the combination of light atomic nuclei to form heavier atomic nuclei Astronomers learn about stars by analyzing the light that the stars emit. ...
... Nuclear fusion is the combination of light atomic nuclei to form heavier atomic nuclei Astronomers learn about stars by analyzing the light that the stars emit. ...
Document
... the Greeks rejected the heliocentric theory because they did not • Example: detect stellar parallax. Tycho later realized that this is because stars are too far away to measure with current precision. ...
... the Greeks rejected the heliocentric theory because they did not • Example: detect stellar parallax. Tycho later realized that this is because stars are too far away to measure with current precision. ...
Astronomy 114 Problem Set # 7 Due: 30 Apr 2007 SOLUTIONS 1
... spiral arms, bluer color of stellar light on the leading edges of spiral arms, and the overall bluer color of spiral galaxies. By contrast, elliptical galaxies show little or no star formation and low relative gas fraction. Elliptical galaxies would be the worst place to look for new star formation. ...
... spiral arms, bluer color of stellar light on the leading edges of spiral arms, and the overall bluer color of spiral galaxies. By contrast, elliptical galaxies show little or no star formation and low relative gas fraction. Elliptical galaxies would be the worst place to look for new star formation. ...
Lecture 13: The stars are suns
... • Apparent brightness is not a measure of the luminosity (in watts) of a star. Star of given brightness could be: dim but close, or luminous and distant. • Inverse Square Law for light tell us that the flux is inversely proportional to the distance squared: f= ...
... • Apparent brightness is not a measure of the luminosity (in watts) of a star. Star of given brightness could be: dim but close, or luminous and distant. • Inverse Square Law for light tell us that the flux is inversely proportional to the distance squared: f= ...
Distances to Stars Scales of Size and Time
... New distance scale: 1 light year (ly) = Distance traveled by light in 1 year = 63,000 AU = 1013 km = 10,000,000,000,000 km (= 1 + 13 zeros) = 10 trillion km Approx. 17 light years ...
... New distance scale: 1 light year (ly) = Distance traveled by light in 1 year = 63,000 AU = 1013 km = 10,000,000,000,000 km (= 1 + 13 zeros) = 10 trillion km Approx. 17 light years ...
using a cepheid variable to determine distance
... In this exercise you will use data taken from observations of a Cepheid variable star over a period of 80 days. On each day, the apparent visual magnitude was recorded. Using this data you will be able to plot a light-curve for this Cepheid, and from this light curve, determine the period of the lig ...
... In this exercise you will use data taken from observations of a Cepheid variable star over a period of 80 days. On each day, the apparent visual magnitude was recorded. Using this data you will be able to plot a light-curve for this Cepheid, and from this light curve, determine the period of the lig ...
The Brightness of Stars
... distance from us. Knowing this helps astronomers find its distance using a method known as ...
... distance from us. Knowing this helps astronomers find its distance using a method known as ...
Solutions to test #2 taken on Monday
... e) ____T____ Near the event horizon of a black hole, time runs slower than it does farther away from the black hole. f) ____T____ No light produced in the core of the Sun ever reaches the surface. g) ____T____ Our Sun is a fairly normal G2 type star. h) ____F____ The convection layer in the Sun is t ...
... e) ____T____ Near the event horizon of a black hole, time runs slower than it does farther away from the black hole. f) ____T____ No light produced in the core of the Sun ever reaches the surface. g) ____T____ Our Sun is a fairly normal G2 type star. h) ____F____ The convection layer in the Sun is t ...
Document
... Astronomical distances are so large that we use the speed of light to measure them Mean Earth-Sun Distance – 150 million Km = 1 Astronomical Unit (AU) = 8.3 Light Minutes 1 Light Year (Ly) = 9.5 trillion Km = 63,240 AU Parsec = 3.26 Lys (parallax angle unit) ...
... Astronomical distances are so large that we use the speed of light to measure them Mean Earth-Sun Distance – 150 million Km = 1 Astronomical Unit (AU) = 8.3 Light Minutes 1 Light Year (Ly) = 9.5 trillion Km = 63,240 AU Parsec = 3.26 Lys (parallax angle unit) ...
PowerPoint on finding the distance to a star using Parallax
... Finding the distance to nearby stars using Parallax: 2 • This experiment illustrates the basic idea involved in stellar parallax. • The first step is to identify a ‘nearby’ star by observing its parallax relative to the ‘fixed’ distant stars. ...
... Finding the distance to nearby stars using Parallax: 2 • This experiment illustrates the basic idea involved in stellar parallax. • The first step is to identify a ‘nearby’ star by observing its parallax relative to the ‘fixed’ distant stars. ...
Review Day
... stars held together by gravity. There are 3 types of galaxies: Spiral: Pinwheel shape with stars on the arms and gas and dust clustered in the center. Thought that a black hole is in center. ...
... stars held together by gravity. There are 3 types of galaxies: Spiral: Pinwheel shape with stars on the arms and gas and dust clustered in the center. Thought that a black hole is in center. ...
STARS and GALAXIES
... • Some stars are very old and the size of planets or moons, and some no longer emit radiation (no light). ...
... • Some stars are very old and the size of planets or moons, and some no longer emit radiation (no light). ...
Astronomical Distances
... stars or galaxies, you often see light years used as a unit of distance. Our nearest star is 4.2 light years away. So how far away is 1 light year? It refers to the distance that a photon of light travels in a 1 year period. The speed of light is 300,000km per second, or 1,080 million km per hour (a ...
... stars or galaxies, you often see light years used as a unit of distance. Our nearest star is 4.2 light years away. So how far away is 1 light year? It refers to the distance that a photon of light travels in a 1 year period. The speed of light is 300,000km per second, or 1,080 million km per hour (a ...
The Danger of Deadly Cosmic Explosions
... a supernova – Brighter than a galaxy for a few days – More radiation than during whole life of star ...
... a supernova – Brighter than a galaxy for a few days – More radiation than during whole life of star ...
Galaxies - Indiana University Astronomy
... Calculate the absolute magnitude from the distance and the apparent magnitude using the inverse square law. Recall that the distance in parsecs is related to the difference between the absolute and apparent magnitude as follows: Distance in parsecs = 10(m-M+5)/5 In this case, we know the distance a ...
... Calculate the absolute magnitude from the distance and the apparent magnitude using the inverse square law. Recall that the distance in parsecs is related to the difference between the absolute and apparent magnitude as follows: Distance in parsecs = 10(m-M+5)/5 In this case, we know the distance a ...
Distance to Stars
... 40 trillion km from the sun. (more than 260,000AU) • Light takes 4.2 years to reach Earth. ...
... 40 trillion km from the sun. (more than 260,000AU) • Light takes 4.2 years to reach Earth. ...
Distances in space ppt
... A Light Year is a standard unit of measurement for interstellar distances beyond the solar system. Milky Way Galaxy is approx. 100,000 LY across in distance ...
... A Light Year is a standard unit of measurement for interstellar distances beyond the solar system. Milky Way Galaxy is approx. 100,000 LY across in distance ...
Distances in Space Vocabulary
... A Light Year is a standard unit of measurement for interstellar distances beyond the solar system. Milky Way Galaxy is approx. 100,000 LY across in distance ...
... A Light Year is a standard unit of measurement for interstellar distances beyond the solar system. Milky Way Galaxy is approx. 100,000 LY across in distance ...
1. The distances to the most remote galaxies can be
... a) is a plot of rotation velocity versus distance from the galactic centre. b) indicates that the Galaxy could be imbedded in a halo of dark matter. c) shows that at large distances from the galactic centre, i.e. beyond the Sun’s distance, objects are ...
... a) is a plot of rotation velocity versus distance from the galactic centre. b) indicates that the Galaxy could be imbedded in a halo of dark matter. c) shows that at large distances from the galactic centre, i.e. beyond the Sun’s distance, objects are ...
Name Date Period ______ 30.1 Characteristics of Stars Definitions
... 19. What are circumpolar stars? What is one example? ...
... 19. What are circumpolar stars? What is one example? ...
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.