Chpt14b
... The stars, gas, and dust in the galaxy all obey Kepler’s laws of planetary motion. Thus the inner matterial rotates faster than the outer matterial. If spiral arms were tied to the galaxy then after a few 100,000,000 years they would all be wound up and loose their shape. ...
... The stars, gas, and dust in the galaxy all obey Kepler’s laws of planetary motion. Thus the inner matterial rotates faster than the outer matterial. If spiral arms were tied to the galaxy then after a few 100,000,000 years they would all be wound up and loose their shape. ...
Early Spring Observing – Millstone News Night Sky
... The Beehive contains a larger star population than most other nearby clusters. Under dark skies the Beehive Cluster looks like a nebulous object to the naked eye; thus it has been known since ancient times. We often find it, rather than the constellation it is found in (Cancer). From Wikipedia: The ...
... The Beehive contains a larger star population than most other nearby clusters. Under dark skies the Beehive Cluster looks like a nebulous object to the naked eye; thus it has been known since ancient times. We often find it, rather than the constellation it is found in (Cancer). From Wikipedia: The ...
proper motion
... The Sun-centered model of the solar system laid out by Copernicus in De Revolutionibus (1543) made a very specific prediction: that the nearby stars should exhibit parallax shifts with respect to the distant background of stars. Tycho Brahe improved positional measures from +/- 10 arc minutes to as ...
... The Sun-centered model of the solar system laid out by Copernicus in De Revolutionibus (1543) made a very specific prediction: that the nearby stars should exhibit parallax shifts with respect to the distant background of stars. Tycho Brahe improved positional measures from +/- 10 arc minutes to as ...
Nebula - NICADD
... Molecular Clouds • The small mass of atoms creates very weak gravity. – Pull atoms and molecules together ...
... Molecular Clouds • The small mass of atoms creates very weak gravity. – Pull atoms and molecules together ...
LAB #3 - GEOCITIES.ws
... brightness. This difference now defines the magnitude scale. With this new definition, the magnitude scale was broadened to the very brightest stars the Greeks saw, and some magnitudes became negative. With light-meter instruments capable of discerning small differences in brightness, some magnitude ...
... brightness. This difference now defines the magnitude scale. With this new definition, the magnitude scale was broadened to the very brightest stars the Greeks saw, and some magnitudes became negative. With light-meter instruments capable of discerning small differences in brightness, some magnitude ...
Document
... 2. Why couldn't you stand on the Sun's surface? a) You could stand on the surface. b) The Sun doesn't have a solid surface. c) The Sun's surface is too highly magnetized for anything to survive there. d) You could stand on it, if a sufficiently protective spacesuit could be designed. 3. The temperat ...
... 2. Why couldn't you stand on the Sun's surface? a) You could stand on the surface. b) The Sun doesn't have a solid surface. c) The Sun's surface is too highly magnetized for anything to survive there. d) You could stand on it, if a sufficiently protective spacesuit could be designed. 3. The temperat ...
AST101_lect_12
... • Stars generate luminosity through fusion of H into He • The lifetime of a star is proportional to the amount of fuel it has (mass) divided by the rate at which it expends the fuel (luminosity) • The lifetime τ ~ M/L • This is analogous to determining how often you have to refill the gas tank in yo ...
... • Stars generate luminosity through fusion of H into He • The lifetime of a star is proportional to the amount of fuel it has (mass) divided by the rate at which it expends the fuel (luminosity) • The lifetime τ ~ M/L • This is analogous to determining how often you have to refill the gas tank in yo ...
Lecture 19
... Might be normal matter in a form that doesn’t emit much light – very small and dim star, little black holes • More likely it is elementary particles other than normal matter ...
... Might be normal matter in a form that doesn’t emit much light – very small and dim star, little black holes • More likely it is elementary particles other than normal matter ...
Historical overview
... 1924: Edwin Hubble determines distances to Andromeda and the Triangulum “nebulae” as 900,000 and 850,000 light years: much too far to be a part of the Milky Way! These must be other galaxies! (current distance values 2.5 million and 2.7 million light years) ...
... 1924: Edwin Hubble determines distances to Andromeda and the Triangulum “nebulae” as 900,000 and 850,000 light years: much too far to be a part of the Milky Way! These must be other galaxies! (current distance values 2.5 million and 2.7 million light years) ...
science - Amazon Web Services
... motions, positions, dimensions, and destinies of the planets, stars, and other heavenly bodies in our universe. Man has known or conjectured about our solar system for many years through mathematical computations, telescopic observation, and just plain imagination. Scientists have made startling new ...
... motions, positions, dimensions, and destinies of the planets, stars, and other heavenly bodies in our universe. Man has known or conjectured about our solar system for many years through mathematical computations, telescopic observation, and just plain imagination. Scientists have made startling new ...
Stars, Galaxies & Universe
... Classifying Stars • Stars are classified by size, temperature, and brightness. • Temperature of a star is indicated by color, hot stars are blue & cooler stars are red. • Apparent brightness is the brightness of a star as observed from earth. • Absolute magnitude is the brightness of a star observe ...
... Classifying Stars • Stars are classified by size, temperature, and brightness. • Temperature of a star is indicated by color, hot stars are blue & cooler stars are red. • Apparent brightness is the brightness of a star as observed from earth. • Absolute magnitude is the brightness of a star observe ...
Observing the Universe from the Classroom
... “While looking at the galaxy cluster Abell 2667, astronomers found an odd-looking spiral galaxy that ploughs through a galaxy cluster at a speed of more thsn 3.5 million km/h, to which it was accelerated by the cluster’s huge gravitational field.” ...
... “While looking at the galaxy cluster Abell 2667, astronomers found an odd-looking spiral galaxy that ploughs through a galaxy cluster at a speed of more thsn 3.5 million km/h, to which it was accelerated by the cluster’s huge gravitational field.” ...
Scientists classify stars by
... The gravity of a passing star or the shock wave from a nearby supernova may cause the nebula to contract. 1. Matter in the gas cloud will begin to come together into a dense region called a protostar. 2. As the protostar continues to condense, it heats up. 3. Eventually, it reaches a critical mass a ...
... The gravity of a passing star or the shock wave from a nearby supernova may cause the nebula to contract. 1. Matter in the gas cloud will begin to come together into a dense region called a protostar. 2. As the protostar continues to condense, it heats up. 3. Eventually, it reaches a critical mass a ...
NAME:______ANSWER KEY_______________________Period
... Unit 10-11 Review Sheet ANSWER KEY 1. What is the universe made up of? matter, energy, and space 2. What does light year measure? distance 3. Why do we use light year instead of kilometers? Kilometers would be way to big of a number 4. Change the following number 78,000,000 to scientific notation. 7 ...
... Unit 10-11 Review Sheet ANSWER KEY 1. What is the universe made up of? matter, energy, and space 2. What does light year measure? distance 3. Why do we use light year instead of kilometers? Kilometers would be way to big of a number 4. Change the following number 78,000,000 to scientific notation. 7 ...
1128/1130 Discussion Notes
... orbit? Newton’s version of Kepler’s third law is based upon gravity. (If we had derived this law from basic physical principles rather than simply presenting it to you, this would be obvious. As it is, just trust me on this one.) The force of gravity from the material outside of the orbit is in all ...
... orbit? Newton’s version of Kepler’s third law is based upon gravity. (If we had derived this law from basic physical principles rather than simply presenting it to you, this would be obvious. As it is, just trust me on this one.) The force of gravity from the material outside of the orbit is in all ...
The Milky Way - Indiana University Astronomy
... The dust is transparent to infrared light, and we can see through the gas and dust to observe the Galactic Center ...
... The dust is transparent to infrared light, and we can see through the gas and dust to observe the Galactic Center ...
Chapter 12
... Cepheid Variables: The Period-Luminosity Relation The variability period of a Cepheid variable is correlated with its luminosity. The more luminous it is, the more slowly it pulsates. => Measuring a Cepheid’s period, we can determine its absolute magnitude! ...
... Cepheid Variables: The Period-Luminosity Relation The variability period of a Cepheid variable is correlated with its luminosity. The more luminous it is, the more slowly it pulsates. => Measuring a Cepheid’s period, we can determine its absolute magnitude! ...
Galaxies and the Distance Ladder
... This image was made by superimposing a picture made a visible wavelength, an image made at X-ray wavelengths (revealing hot gas as red blobs), and a map of dark matter (blue blobs) deduced from gravitational lensing. Figure 16.35, Arny and Schneider, 5th ed. Explorations, © 2008 The McGraw-Hill Comp ...
... This image was made by superimposing a picture made a visible wavelength, an image made at X-ray wavelengths (revealing hot gas as red blobs), and a map of dark matter (blue blobs) deduced from gravitational lensing. Figure 16.35, Arny and Schneider, 5th ed. Explorations, © 2008 The McGraw-Hill Comp ...
Homework PHY121 (Astronomy
... A: When we say, “if the Earth did not rotate”, we mean that relative to space (i.e. to the rest of the Universe) the Earth would not rotate. In that case, the sky would stand still. We would always see the same stars on our sky. The only changes on our sky would come from the moving planets, the Moo ...
... A: When we say, “if the Earth did not rotate”, we mean that relative to space (i.e. to the rest of the Universe) the Earth would not rotate. In that case, the sky would stand still. We would always see the same stars on our sky. The only changes on our sky would come from the moving planets, the Moo ...
Hubble`s Constant - Scientific Research Publishing
... some definite past time; in such a way that the expansion rate determines the age of the Universe. Hubble’s constant measures how fast is the process of the expansion, and it is involved in Hubble’s law. The larger the Hubble’s constant, the faster the expansion rate. Also, Hubble’s constant is a me ...
... some definite past time; in such a way that the expansion rate determines the age of the Universe. Hubble’s constant measures how fast is the process of the expansion, and it is involved in Hubble’s law. The larger the Hubble’s constant, the faster the expansion rate. Also, Hubble’s constant is a me ...
Solutions
... The right side integration is trivial. The left side gives 1/3T3 evaluated from Ti to Tf which works out to be 1/3Tf3. Simple algebra gives you the desired formula. d (5 points) How many years are needed for a one solar mass white dwarf with the radius of the Earth to cool to Tf=1500K? ...
... The right side integration is trivial. The left side gives 1/3T3 evaluated from Ti to Tf which works out to be 1/3Tf3. Simple algebra gives you the desired formula. d (5 points) How many years are needed for a one solar mass white dwarf with the radius of the Earth to cool to Tf=1500K? ...
Types of Stars - WordPress.com
... astronomers discovered most stars seen from Earth are Binary stars • 2 stars that orbit together (same orbit) • By measuring orbit size and time lapsed, it is possible to calculate “solar mass” • Sun = 1 solar mass ...
... astronomers discovered most stars seen from Earth are Binary stars • 2 stars that orbit together (same orbit) • By measuring orbit size and time lapsed, it is possible to calculate “solar mass” • Sun = 1 solar mass ...
Homework 1 – Exercise 1 1/9
... Homework 1 – Exercise 3 In 1672, an international effort was made to measure the parallax angle of Mars at the time of opposition, when it was closest to Earth. Consider two observers who are separated by a baseline equal to Earth’s diameter. If the difference in their measurements of Mars’s angula ...
... Homework 1 – Exercise 3 In 1672, an international effort was made to measure the parallax angle of Mars at the time of opposition, when it was closest to Earth. Consider two observers who are separated by a baseline equal to Earth’s diameter. If the difference in their measurements of Mars’s angula ...
Startalk
... A big glowing ball of gas! Contains mainly H and He They have a core that is dense and super hot! Nuclear fusion is the source of their energy! ...
... A big glowing ball of gas! Contains mainly H and He They have a core that is dense and super hot! Nuclear fusion is the source of their energy! ...
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.