Ch 1 Jan 17
... Why can't we see a galaxy 15 billion light-years away? (Assume the universe is 14 billion years old.) A. Because no galaxies exist at such a great distance. B. Galaxies may exist at that distance, but their light would be too faint for our telescopes to see. C. Because looking 15 billion light-years ...
... Why can't we see a galaxy 15 billion light-years away? (Assume the universe is 14 billion years old.) A. Because no galaxies exist at such a great distance. B. Galaxies may exist at that distance, but their light would be too faint for our telescopes to see. C. Because looking 15 billion light-years ...
Week8Lecture1
... 4) Use the relationship between apparent brightness and luminosity to determine the distance ...
... 4) Use the relationship between apparent brightness and luminosity to determine the distance ...
How astronomers measure brightness and colours – the magnitude
... The magnitudes can be subtracted from each other to form colour indices (e.g. B − V ), note that this is equivalent to division of the fluxes in the two filters. A non-zero colour index means that the apparent flux from the object is stronger in one filter than in the other. The colour indices are u ...
... The magnitudes can be subtracted from each other to form colour indices (e.g. B − V ), note that this is equivalent to division of the fluxes in the two filters. A non-zero colour index means that the apparent flux from the object is stronger in one filter than in the other. The colour indices are u ...
- St. Agnes Church
... Now…if we rescaled these distances down to familiar units of measure… if we represent the distance between the earth and the sun as one inch, then the distance between our sun and Alpha Centauri would be 275,310 inches or 4.37 miles. In local terms, if the distance between earth and sun was one inch ...
... Now…if we rescaled these distances down to familiar units of measure… if we represent the distance between the earth and the sun as one inch, then the distance between our sun and Alpha Centauri would be 275,310 inches or 4.37 miles. In local terms, if the distance between earth and sun was one inch ...
PH109 Exploring the Universe, Test#4, Spring 2005 Please indicate
... b) We can reflect them off the core of the Galaxy. c) Their Doppler shifts let us map the motions and locations of spiral arms. d) They bounce off stars like our Sun to let us precisely measure their distances. 28. Why are the supermassive giant ellipticals found at the centers of the rich galaxy cl ...
... b) We can reflect them off the core of the Galaxy. c) Their Doppler shifts let us map the motions and locations of spiral arms. d) They bounce off stars like our Sun to let us precisely measure their distances. 28. Why are the supermassive giant ellipticals found at the centers of the rich galaxy cl ...
Test#4
... 18. The reason the Solar system does not have a lot of dust and gas between the planets is a) the solar wind blew the dust and gas out of the Solar system b) the planets accreted all the gas and dust c) the early Solar system was made up only of Hydrogen and Helium d) the Sun burns them up 19. All ...
... 18. The reason the Solar system does not have a lot of dust and gas between the planets is a) the solar wind blew the dust and gas out of the Solar system b) the planets accreted all the gas and dust c) the early Solar system was made up only of Hydrogen and Helium d) the Sun burns them up 19. All ...
Messing Up a Galaxy
... A rather fascinating aspect of collisions between galaxies is that collisions between the stars themselves are very rare indeed. This is because the spaces between the stars in a galaxy are typically very large compared with the stars' sizes. In our region of space, the distance from the Sun to its ...
... A rather fascinating aspect of collisions between galaxies is that collisions between the stars themselves are very rare indeed. This is because the spaces between the stars in a galaxy are typically very large compared with the stars' sizes. In our region of space, the distance from the Sun to its ...
Teaching astrophysics in VCE Physics
... $ Copernicus started a revolution by suggesting a heliocentric view - but what were the stars? Surely not ‘suns’ at huge distances? Newton calculated that if Sirius was like the Sun it would have to be about a million times further away (it is actually about ½ mill AU). This was just incomprehensibl ...
... $ Copernicus started a revolution by suggesting a heliocentric view - but what were the stars? Surely not ‘suns’ at huge distances? Newton calculated that if Sirius was like the Sun it would have to be about a million times further away (it is actually about ½ mill AU). This was just incomprehensibl ...
ISP 205: Visions of the Universe
... • Light travels at a finite speed (300,000 km/s). • The farther away we look in distance, the further back we look in time. • Allows us to study the history of the Universe. ...
... • Light travels at a finite speed (300,000 km/s). • The farther away we look in distance, the further back we look in time. • Allows us to study the history of the Universe. ...
Chapter 1 - A Modern View of the Universe
... Comet A relatively small and primarily icy object which orbits a star. ...
... Comet A relatively small and primarily icy object which orbits a star. ...
Astronomy Review revised Key
... 23. If the star is located 4.3 light years away, how long will it be before we see the light of the star? 4.4 years. 18. What is the Big Bang Theory? The theory that all matter was once condensed into a single point called the singularity, and that singularity exploded sending matter out in ...
... 23. If the star is located 4.3 light years away, how long will it be before we see the light of the star? 4.4 years. 18. What is the Big Bang Theory? The theory that all matter was once condensed into a single point called the singularity, and that singularity exploded sending matter out in ...
H-R Diagram - SFA Physics
... stars in the night sky. Transfer the main sequence curve from Figure 1 onto Figure 2. ...
... stars in the night sky. Transfer the main sequence curve from Figure 1 onto Figure 2. ...
Earth Science 11 Chapter 28 Answers: 28.1 1. All are forms of
... 1. The universe includes everything that exists; the observable universe includes only that which we can observe. The observable universe is limited in size by a combination of the age of the universe, and the speed of light. 2. Most galaxies are either spiral or elliptical. 3. The total energy emit ...
... 1. The universe includes everything that exists; the observable universe includes only that which we can observe. The observable universe is limited in size by a combination of the age of the universe, and the speed of light. 2. Most galaxies are either spiral or elliptical. 3. The total energy emit ...
22 Stellar Remnant/HR Diagram
... • “force” of gravity is really caused by the curvature of spacetime! ...
... • “force” of gravity is really caused by the curvature of spacetime! ...
Life in the Universe - University of Georgia
... Angle, distance, and Powers of Ten Lecture 2 by Inseok Song ...
... Angle, distance, and Powers of Ten Lecture 2 by Inseok Song ...
Abstract
... observational technique allow us to directly observe the universe 10 billion years ago and find bright young objects there. Lyman α emitters1 have been recently discovered at redshifts greater than 3 (2.1109 yr after the Big-Bang) and Lyman break galaxies2 are high-redshift star-forming galaxies wi ...
... observational technique allow us to directly observe the universe 10 billion years ago and find bright young objects there. Lyman α emitters1 have been recently discovered at redshifts greater than 3 (2.1109 yr after the Big-Bang) and Lyman break galaxies2 are high-redshift star-forming galaxies wi ...
Slide 1
... An H–R diagram of the 100 brightest stars looks quite different: These stars are all more luminous than the Sun. Two new categories appear here – the red giants and the blue giants. Clearly, the brightest stars in the sky appear bright because of their enormous luminosities, not their proximity. ...
... An H–R diagram of the 100 brightest stars looks quite different: These stars are all more luminous than the Sun. Two new categories appear here – the red giants and the blue giants. Clearly, the brightest stars in the sky appear bright because of their enormous luminosities, not their proximity. ...
Lecture 2 Astronomical Distances
... Largely due to Milky Way (Local Group) falling toward Virgo Cluster. ...
... Largely due to Milky Way (Local Group) falling toward Virgo Cluster. ...
1. Which of the following correctly lists our “cosmic address” from
... 8. If the distance to galaxy A from us is the farther than the the distance to galaxy B from us, which of the following is right? (a) If the two galaxies are within our Local Group, they can move in any directions, but the speed of A must be greater than the speed of B. (b) If the two galaxies are ...
... 8. If the distance to galaxy A from us is the farther than the the distance to galaxy B from us, which of the following is right? (a) If the two galaxies are within our Local Group, they can move in any directions, but the speed of A must be greater than the speed of B. (b) If the two galaxies are ...
SOLUTIONS ASTROPHYSICS – OPTION D 2015-17
... The big bang signifies the beginning of time and space. At the big bang the universe was a point and so the big bang happened everywhere in the universe. The question is meaningless within the big bang model since by definition time started with the big bang. It is as meaningless as to ask for a pla ...
... The big bang signifies the beginning of time and space. At the big bang the universe was a point and so the big bang happened everywhere in the universe. The question is meaningless within the big bang model since by definition time started with the big bang. It is as meaningless as to ask for a pla ...
universe.pps - Prophet Muhammad For All
... The map shows several stars visible with the naked eye which are located deep within the Orion arm. The most notable group of stars here are main stars in the constellation of Orion -from which the spiral arm gets its name. All of these stars are bright giant and supergiant -stars, thousands of time ...
... The map shows several stars visible with the naked eye which are located deep within the Orion arm. The most notable group of stars here are main stars in the constellation of Orion -from which the spiral arm gets its name. All of these stars are bright giant and supergiant -stars, thousands of time ...
HNRS 227 Lecture #2 Chapters 2 and 3
... Elliptical galaxies are nearly devoid of interstellar gas and dust, and so star formation is severely inhibited ...
... Elliptical galaxies are nearly devoid of interstellar gas and dust, and so star formation is severely inhibited ...
Chapter 10: Measuring the Stars - Otto
... Spectral class subdivisions • Each letter has 10 subdivisions, 0 - 9 • 0 is hottest, 9 is coolest, within letter class • Sun is G2 (cooler than G1, hotter than G3) ...
... Spectral class subdivisions • Each letter has 10 subdivisions, 0 - 9 • 0 is hottest, 9 is coolest, within letter class • Sun is G2 (cooler than G1, hotter than G3) ...
TEK 8 Test Review 1. List the three subatomic particles and give
... 16. Stars are classified on the Hertzsprung - Russell diagram according to their absolute magnitude and their surface temperatures at a given time in a star’s life cycle. What classification would a star have if it was very hot and very bright? ...
... 16. Stars are classified on the Hertzsprung - Russell diagram according to their absolute magnitude and their surface temperatures at a given time in a star’s life cycle. What classification would a star have if it was very hot and very bright? ...
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.