homework assignment 6
... outside of the textbook) for the text’s intriguing statement on page 160: “Galaxies do not start as ellipticals and then progress to be spirals, though there is some evidence that the reverse is true.” For this question, I do want a full citation. ...
... outside of the textbook) for the text’s intriguing statement on page 160: “Galaxies do not start as ellipticals and then progress to be spirals, though there is some evidence that the reverse is true.” For this question, I do want a full citation. ...
Teachers` guide
... Aim of this educational materials The supernova explosion is used as a method to measure the distance to far galaxies. Because the supernova explosion is very violent phenomenon, we can easily detect fairly far supernova’s appearance. Also, a part of supernova explosion which is called as Type Ia ha ...
... Aim of this educational materials The supernova explosion is used as a method to measure the distance to far galaxies. Because the supernova explosion is very violent phenomenon, we can easily detect fairly far supernova’s appearance. Also, a part of supernova explosion which is called as Type Ia ha ...
Understanding Stars
... – Reminder: small magnitudes are bright • A parsec is 3.26 light years Luminosity • Luminosity: how much energy the star puts out. – luminosity is a measure of the energy in the form of photons • Big luminosities are bright – 1 order of magnitude is roughly equal to 20 units of luminosity Absolute M ...
... – Reminder: small magnitudes are bright • A parsec is 3.26 light years Luminosity • Luminosity: how much energy the star puts out. – luminosity is a measure of the energy in the form of photons • Big luminosities are bright – 1 order of magnitude is roughly equal to 20 units of luminosity Absolute M ...
Unit 2 Review Guide
... 2. What is the name of our own galaxy? 3. What type is our galaxy? How big is it? 4. What type of galaxy is most abundant in the universe? 5. What type of galaxy contains both young and old stars? 6. What type of galaxy contains only old stars? only young stars? Both old and young stars? 8. Besides ...
... 2. What is the name of our own galaxy? 3. What type is our galaxy? How big is it? 4. What type of galaxy is most abundant in the universe? 5. What type of galaxy contains both young and old stars? 6. What type of galaxy contains only old stars? only young stars? Both old and young stars? 8. Besides ...
PHY2083
... Luminosity does NOT depend on distance, but flux does. If a star appears faint, is it because it is really (i.e. intrinsically) faint, or because it is very far away [or ...
... Luminosity does NOT depend on distance, but flux does. If a star appears faint, is it because it is really (i.e. intrinsically) faint, or because it is very far away [or ...
stars and galaxies – study guide
... 27. A black hole is the densest object in the universe, and no light escapes. 28. The absolute magnitude is a measurement that compares the true brightness of stars. 29. What kind of spectrum comes from white light? Continuous 30. Some constellations can only be seen during certain seasons because t ...
... 27. A black hole is the densest object in the universe, and no light escapes. 28. The absolute magnitude is a measurement that compares the true brightness of stars. 29. What kind of spectrum comes from white light? Continuous 30. Some constellations can only be seen during certain seasons because t ...
distance to the centre of the Milky Way.
... system, now known to be about 100,000 light years in diameter. Note that Shapley actually overestimated the distances somewhat, because he didn’t fully understand the effects of the obscuring dust. But this changed understanding was still absolutely correct in principle! We are in no special place! ...
... system, now known to be about 100,000 light years in diameter. Note that Shapley actually overestimated the distances somewhat, because he didn’t fully understand the effects of the obscuring dust. But this changed understanding was still absolutely correct in principle! We are in no special place! ...
Stellar Physics Lecture 1
... – The narrow band of stars scattered close to the solid line. – Most stars occur along this band – an indication that this is where stars spend most of their lives. For this reason, it is known as the Main Sequence. ...
... – The narrow band of stars scattered close to the solid line. – Most stars occur along this band – an indication that this is where stars spend most of their lives. For this reason, it is known as the Main Sequence. ...
Problem 4 : a. (20 points)
... something less than one per cubic parsec. This is consistent with one of our past studio exercises (on interstellar reddening) where we were told that the local density of stars is something like 0.1 per cubic parsec. If the center of our galaxy were made up of ordinary stars, this problem suggests ...
... something less than one per cubic parsec. This is consistent with one of our past studio exercises (on interstellar reddening) where we were told that the local density of stars is something like 0.1 per cubic parsec. If the center of our galaxy were made up of ordinary stars, this problem suggests ...
Document
... Physical size =840(0.5/57.3)= 7xdiameter Earth. => Earth orbits Sun, Was ignored. Modern distance ≈ 12000 diameter Determined by parallax ...
... Physical size =840(0.5/57.3)= 7xdiameter Earth. => Earth orbits Sun, Was ignored. Modern distance ≈ 12000 diameter Determined by parallax ...
Physics 1025: Lecture 18 Stellar Magnitudes, Absolute Magnitudes
... so brightness ratio = (100) x (100) x 16 = 160,000 and thus the m = 7 star is 160,000 times brighter than the m = 20 star. Now there are problems with visual magnitudes, which are based on what the eye sees. The eye is not to reliable, and of course must be thoroughly dark-adapted. Then there’s the ...
... so brightness ratio = (100) x (100) x 16 = 160,000 and thus the m = 7 star is 160,000 times brighter than the m = 20 star. Now there are problems with visual magnitudes, which are based on what the eye sees. The eye is not to reliable, and of course must be thoroughly dark-adapted. Then there’s the ...
Astronomical distance
... Astronomical distances Light travels at an enormous speed (300 000 km/s) but even so the distances between stars and between our galaxy and other galaxies are so vast that even light takes a long time to travel to us from these distant objects. As you know distances in astronomy can be measure in li ...
... Astronomical distances Light travels at an enormous speed (300 000 km/s) but even so the distances between stars and between our galaxy and other galaxies are so vast that even light takes a long time to travel to us from these distant objects. As you know distances in astronomy can be measure in li ...
Life Cycles of Stars
... The Heavens Are Not Changeless • The Stars Move – Most of our constellations would have been unrecognizable to Neanderthal Man ...
... The Heavens Are Not Changeless • The Stars Move – Most of our constellations would have been unrecognizable to Neanderthal Man ...
The Scale of the Cosmos
... Earth, but the sun is about 110 times larger that the Earth, and is a typical or average size for a star. ...
... Earth, but the sun is about 110 times larger that the Earth, and is a typical or average size for a star. ...
Red Shift Worksheet
... these objects moves through space toward an observer, the waves of electromagnetic radiation between the object and the observer move closer together. That is, the distance between the crests of the waves decreases, causing the wavelength to shorten. If that same object moved away from an observer, ...
... these objects moves through space toward an observer, the waves of electromagnetic radiation between the object and the observer move closer together. That is, the distance between the crests of the waves decreases, causing the wavelength to shorten. If that same object moved away from an observer, ...
Type Ia supernovae and the ESSENCE supernova survey
... stars in the sky are said to be “of the first magnitude”. The faintest stars visible to the unaided eye are 6th magnitude. For two stars of intensity I1 and I2 their apparent magnitudes are related as follows: m2 – m1 = log (I2/I1) Thus, if we receive 100 times as many photons per second from ...
... stars in the sky are said to be “of the first magnitude”. The faintest stars visible to the unaided eye are 6th magnitude. For two stars of intensity I1 and I2 their apparent magnitudes are related as follows: m2 – m1 = log (I2/I1) Thus, if we receive 100 times as many photons per second from ...
Topic E: Astrophysics E1 Introduction to the Universe.
... Used to measure distances _____________________ of our solar system Other important units. Astronomical unit (AU) – the average distance between the Sun and Earth 1AU = 1.5 x 1011m Used to measure distances ____________________our solar system Parsec (pc) – 1parsec = __________________ ly ...
... Used to measure distances _____________________ of our solar system Other important units. Astronomical unit (AU) – the average distance between the Sun and Earth 1AU = 1.5 x 1011m Used to measure distances ____________________our solar system Parsec (pc) – 1parsec = __________________ ly ...
The Solar System and Beyond
... The average distance between the Earth and Sun is called an Astronomical Unit or AU. In the meter stick model, one AU is one inch. There are about 63,240 AU in one light-year. There are 63,360 inches in one mile. Because these are almost the same, we can extend our meter stick model solar system to ...
... The average distance between the Earth and Sun is called an Astronomical Unit or AU. In the meter stick model, one AU is one inch. There are about 63,240 AU in one light-year. There are 63,360 inches in one mile. Because these are almost the same, we can extend our meter stick model solar system to ...
Review Guide
... 26. What color are the hottest stars? 27. What color are the coolest stars? 28. Over half the stars in the universe exist as _______________________. 29. How do astronomers calculate the mass of stars? 30. What technique do astronomers use to calculate the distance to stars? 31. Do close stars or fa ...
... 26. What color are the hottest stars? 27. What color are the coolest stars? 28. Over half the stars in the universe exist as _______________________. 29. How do astronomers calculate the mass of stars? 30. What technique do astronomers use to calculate the distance to stars? 31. Do close stars or fa ...
Friday, April 26
... • Mira (=wonderful, lat.) [o Ceti]: sometimes visible with bare eye, sometimes faint • Long period variable star: 332 days period ...
... • Mira (=wonderful, lat.) [o Ceti]: sometimes visible with bare eye, sometimes faint • Long period variable star: 332 days period ...
PowerPoint - Earth Science with Mrs. Wilson
... the absolute magnitude (real brightness) of a star and its surface temperature. They plotted the data on a graph. ...
... the absolute magnitude (real brightness) of a star and its surface temperature. They plotted the data on a graph. ...
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.