1. absolute brightness -
... • The vertical axis is luminosity (in solar units); the horizontal axis is surface temperature from hottest to coolest. • Generally, hotter stars are larger and brighter. ...
... • The vertical axis is luminosity (in solar units); the horizontal axis is surface temperature from hottest to coolest. • Generally, hotter stars are larger and brighter. ...
Astronomy Unit Notes
... Geocentric Theory = the theory, put forward by the ancient Egyptian astronomer Ptolemy, that the Earth was the center of the universe. Heliocentric Theory = the theory, put forward by the Polish scientist Copernicus, that the sun was the center of the universe. ...
... Geocentric Theory = the theory, put forward by the ancient Egyptian astronomer Ptolemy, that the Earth was the center of the universe. Heliocentric Theory = the theory, put forward by the Polish scientist Copernicus, that the sun was the center of the universe. ...
chapter 7
... 3. Use the inverse-square law to compute the magnitude the star would have if seen from 10 parsecs. Knowing the distance and apparent magnitude of a star, one can use the inverse square law to compute what the magnitude of a star would be at 10 pc. This would then be the absolute magnitude of the st ...
... 3. Use the inverse-square law to compute the magnitude the star would have if seen from 10 parsecs. Knowing the distance and apparent magnitude of a star, one can use the inverse square law to compute what the magnitude of a star would be at 10 pc. This would then be the absolute magnitude of the st ...
Unit 1
... 10. If the universe were contracting instead of expanding, how would we know (what would the observations be)? 11. The Andromeda galaxy and the Milky Way are rushing toward each other at a velocity of 130 km/s (or, 300,000 mph!). We will collide in about 60 billion years. Andromeda is about one and ...
... 10. If the universe were contracting instead of expanding, how would we know (what would the observations be)? 11. The Andromeda galaxy and the Milky Way are rushing toward each other at a velocity of 130 km/s (or, 300,000 mph!). We will collide in about 60 billion years. Andromeda is about one and ...
Lec11
... measure rotation curves of other spiral galaxies using the Doppler shift of the 21-cm line of atomic H ...
... measure rotation curves of other spiral galaxies using the Doppler shift of the 21-cm line of atomic H ...
Hypervelocity Globular: A beacon of merging clusters Oleg Gnedin with Alexey Vikhlinin
... • Cannot survive tidal forces of supermassive black hole in M87: requires different acceleration mechanism • Likely belongs to the globular cluster system of M86 group, which is merging head-on with the Virgo cluster: significant probability of reaching the observed velocity • Extreme negative veloc ...
... • Cannot survive tidal forces of supermassive black hole in M87: requires different acceleration mechanism • Likely belongs to the globular cluster system of M86 group, which is merging head-on with the Virgo cluster: significant probability of reaching the observed velocity • Extreme negative veloc ...
80.BrainPopLifeCycleStars
... 1. Stars __________ throughout their lives just like we do; only they live for ___________ of years. 2. They start out as clouds of gas and dust called __________ nurseries. The force of __________ within these clouds slowly pulls the particles together, causing dense clumps to form. 3. If the clump ...
... 1. Stars __________ throughout their lives just like we do; only they live for ___________ of years. 2. They start out as clouds of gas and dust called __________ nurseries. The force of __________ within these clouds slowly pulls the particles together, causing dense clumps to form. 3. If the clump ...
Expanding Universe Lab
... In Figure 2 are spectra of five relatively nearby galaxies. Distances to these galaxies have been derived by other methods and are given in the middle column of Figure 2. The spectra show two separate sets of spectral features. Notice that the copy here is a positive so that absorption lines appear ...
... In Figure 2 are spectra of five relatively nearby galaxies. Distances to these galaxies have been derived by other methods and are given in the middle column of Figure 2. The spectra show two separate sets of spectral features. Notice that the copy here is a positive so that absorption lines appear ...
PDF, 179Kb - Maths Careers
... is too small to see because its radius is 109 times smaller than the sun’s radius. 1.3 x 106 Earths would occupy the same volume as the Sun! In about 5 x 109 years the Sun will become a red giant star and its radius will be at least 1.4 x 108 km. That’s 200 times the length it is now and big enough ...
... is too small to see because its radius is 109 times smaller than the sun’s radius. 1.3 x 106 Earths would occupy the same volume as the Sun! In about 5 x 109 years the Sun will become a red giant star and its radius will be at least 1.4 x 108 km. That’s 200 times the length it is now and big enough ...
Solution Key
... This is just like calculating the distance to the Pleiades, which we did in studio, but in globular clusters, only the low mass stub of the main sequence is visible. You can use any point on that stub to get the distance. For example, at B-V=0.5, the apparent visual magnitude V ≈ 18. The absolute vi ...
... This is just like calculating the distance to the Pleiades, which we did in studio, but in globular clusters, only the low mass stub of the main sequence is visible. You can use any point on that stub to get the distance. For example, at B-V=0.5, the apparent visual magnitude V ≈ 18. The absolute vi ...
Guide to Deep Space Poster PDF
... In the constellation of Serpens lies the Eagle Nebula, (right) a giant cloud of interstellar gas and dust. Here new stars are being born, condensing out of the nebula. The radiation from these stellar infants is energizing the gas, causing it to glow. A closer look at the Eagle Nebula reveals intrig ...
... In the constellation of Serpens lies the Eagle Nebula, (right) a giant cloud of interstellar gas and dust. Here new stars are being born, condensing out of the nebula. The radiation from these stellar infants is energizing the gas, causing it to glow. A closer look at the Eagle Nebula reveals intrig ...
Stars, Galaxies, and the Universe Section 3 Stars, Galaxies, and the
... and are held together by gravity. The center of mass, or barycenter, is somewhere between the two stars. • In star systems that have more than two stars, two stars may revolve rapidly around a common barycenter, while a third star revolves more slowly at a greater distance from the pair. • Astronome ...
... and are held together by gravity. The center of mass, or barycenter, is somewhere between the two stars. • In star systems that have more than two stars, two stars may revolve rapidly around a common barycenter, while a third star revolves more slowly at a greater distance from the pair. • Astronome ...
Astronomy 110 Announcements: 11.1 Properties of Stars
... It would be only 1/3 as bright It would be only 1/6 as bright It would be only 1/9 as bright It would be three times brighter ...
... It would be only 1/3 as bright It would be only 1/6 as bright It would be only 1/9 as bright It would be three times brighter ...
Stars and Constellations Power Point
... •Black holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle. •After a black hole has formed it can continue to grow by absorbing mass from its surroundings. •There is general consensus that supermassive black holes exist in the centers of most ga ...
... •Black holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle. •After a black hole has formed it can continue to grow by absorbing mass from its surroundings. •There is general consensus that supermassive black holes exist in the centers of most ga ...
The Death of Stars
... Type Ia SNe are super important! • Most of the iron in our Universe is from Type Ia supernova. • Because all the Type Ia supernovae ignite at a similar mass (1.4Msun), they have similar luminosities: they are standard candles! • They are really bright 5 billion times brighter than our Sun: so we se ...
... Type Ia SNe are super important! • Most of the iron in our Universe is from Type Ia supernova. • Because all the Type Ia supernovae ignite at a similar mass (1.4Msun), they have similar luminosities: they are standard candles! • They are really bright 5 billion times brighter than our Sun: so we se ...
spring_2002_final - University of Maryland Astronomy
... C. detailed spectra of stars that show a small regular change in Doppler shift. D. the 200 inch telescope to make very long exposures. E. the Voyager spacecraft, which now orbit galactic center 31. If humans do make contact with an intelligent extraterrestrial civilization in another star system usi ...
... C. detailed spectra of stars that show a small regular change in Doppler shift. D. the 200 inch telescope to make very long exposures. E. the Voyager spacecraft, which now orbit galactic center 31. If humans do make contact with an intelligent extraterrestrial civilization in another star system usi ...
Magnitudes - Astronomy @ Walton High School
... Hipparchus, a Greek astronomer, devised a method of measuring the brightness of stars. A bright star would be said to have an apparent magnitude of 1. A faint star has an apparent magnitude of 6. A few stars, planets and of course our own Sun have been recategorised so they appear brighter than 1. S ...
... Hipparchus, a Greek astronomer, devised a method of measuring the brightness of stars. A bright star would be said to have an apparent magnitude of 1. A faint star has an apparent magnitude of 6. A few stars, planets and of course our own Sun have been recategorised so they appear brighter than 1. S ...
What kind of stuff
... Milky Way) • Thus, the size of M31 is 70 kpc, larger than our own Milky Way. • The same is true for billions of galaxies that populate the universe! Our Milky Way is just and “average Joe” galaxy • Overnight people realized that the universe was thousands of times bigger than they thought ...
... Milky Way) • Thus, the size of M31 is 70 kpc, larger than our own Milky Way. • The same is true for billions of galaxies that populate the universe! Our Milky Way is just and “average Joe” galaxy • Overnight people realized that the universe was thousands of times bigger than they thought ...
Lecture2 - UCSB Physics
... Milky Way) • Thus, the size of M31 is 70 kpc, larger than our own Milky Way. • The same is true for billions of galaxies that populate the universe! Our Milky Way is just and “average Joe” galaxy • Overnight people realized that the universe was thousands of times bigger than they thought ...
... Milky Way) • Thus, the size of M31 is 70 kpc, larger than our own Milky Way. • The same is true for billions of galaxies that populate the universe! Our Milky Way is just and “average Joe” galaxy • Overnight people realized that the universe was thousands of times bigger than they thought ...
Lookback Time in Our Everyday Lives
... few seconds later, we hear the thunder. That is because sound travels at “only” 1,235 kilometers per hour (343 meters per second, 767 miles per hour, 1,125 feet per second). So, if a lightning strike is a mile away, we see it almost the instant it happened (0.000005 seconds later), but do not hear i ...
... few seconds later, we hear the thunder. That is because sound travels at “only” 1,235 kilometers per hour (343 meters per second, 767 miles per hour, 1,125 feet per second). So, if a lightning strike is a mile away, we see it almost the instant it happened (0.000005 seconds later), but do not hear i ...
Space Science cource, Department of Physics, Faculty of
... Molecular clouds : building block of stars QuickTimeý Dz TIFFÅià• èkǻǵÅj êLí£ÉvÉçÉOÉâÉÄ Ç™Ç±ÇÃÉsÉNÉ`ÉÉǾå©ÇÈǞǽDžÇÕïKóvÇÇ• ÅB ...
... Molecular clouds : building block of stars QuickTimeý Dz TIFFÅià• èkǻǵÅj êLí£ÉvÉçÉOÉâÉÄ Ç™Ç±ÇÃÉsÉNÉ`ÉÉǾå©ÇÈǞǽDžÇÕïKóvÇÇ• ÅB ...
Starlight and What it Tells Us
... – If two stars have the same color and distance, difference in brightness is due to difference in size – Dwarf and giant stars are literally dwarfs or giants ...
... – If two stars have the same color and distance, difference in brightness is due to difference in size – Dwarf and giant stars are literally dwarfs or giants ...
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.