The World Year of Physics is a worldwide celebration of physics
... combined. These explosions are called supernovae, and their fleeting presence in the night sky has been recorded since antiquity. The physical process by which these stars explode, however, remains a mystery. Conventional wisdom holds that a spherically symmetric mechanism is at work, one that expel ...
... combined. These explosions are called supernovae, and their fleeting presence in the night sky has been recorded since antiquity. The physical process by which these stars explode, however, remains a mystery. Conventional wisdom holds that a spherically symmetric mechanism is at work, one that expel ...
Lesson 6 - Magnitudes of Stars
... apparent brightness “light ratio” The difference between the apparent magnitude and the absolute magnitude. m - M = Distance Modulus 2.512m-M = “light ratio” Now can use our definition of apparent brightness in a useful way. ...
... apparent brightness “light ratio” The difference between the apparent magnitude and the absolute magnitude. m - M = Distance Modulus 2.512m-M = “light ratio” Now can use our definition of apparent brightness in a useful way. ...
Lecture 1 Coordinate Systems - Department of Physics & Astronomy
... •Explosion of white dwarf in a binary system ...
... •Explosion of white dwarf in a binary system ...
03 September: Distances to Stars, Light Years and Parsecs
... meters/sec Distance to Sun = 1 au = 1.496E+11 meters (see Appendix 1), so light travel time from Sun is t=d/c =1.496E+11/2.9979E+08 = ...
... meters/sec Distance to Sun = 1 au = 1.496E+11 meters (see Appendix 1), so light travel time from Sun is t=d/c =1.496E+11/2.9979E+08 = ...
Wednesday, April 23 - Otterbein University
... • 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 ...
Day #3 - Russell County Schools
... electromagnetic radiation. As one of 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 sa ...
... electromagnetic radiation. As one of 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 sa ...
Nata_Feb8 - University of Alberta
... NOTE: this defines intensity only for a non-point type object. The total luminosity L of a galaxy is difficult to define precisely for several reasons: – galaxies do not have well-defined edges, and the extended regions are faint and have a low luminosity gradient. – light from a distant galaxy is r ...
... NOTE: this defines intensity only for a non-point type object. The total luminosity L of a galaxy is difficult to define precisely for several reasons: – galaxies do not have well-defined edges, and the extended regions are faint and have a low luminosity gradient. – light from a distant galaxy is r ...
Lecture notes -
... First point: parallaxes are small (noted by Aristotle). Need a smaller angular unit than degrees • 1 degree = 1/90 of a right angle • 1 arcminute (‘) is 1/60 of a degree • 1 arcsecond (“) is 1/60 of an arcminute ...
... First point: parallaxes are small (noted by Aristotle). Need a smaller angular unit than degrees • 1 degree = 1/90 of a right angle • 1 arcminute (‘) is 1/60 of a degree • 1 arcsecond (“) is 1/60 of an arcminute ...
Chapter 10 Hertzsprung-Russel Diagrams and Distance to Stars
... to the stars were unknown, one could not determine the intrinsic brightness of a star, but only its apparent brightness. As we’ve already said, a bright star that’s very far away would appear much fainter than a dim star that’s much closer. To overcome this problem, scientists began to look at stars ...
... to the stars were unknown, one could not determine the intrinsic brightness of a star, but only its apparent brightness. As we’ve already said, a bright star that’s very far away would appear much fainter than a dim star that’s much closer. To overcome this problem, scientists began to look at stars ...
Word
... No milky-way is seen. We conclude that we are not, therefore, in the disk of a galaxy. Instead, a vast collection of faint stars covers around 25% of the sky. We are calling it the Milk Stain. This could be an elliptical galaxy or a globular cluster. Several pulsing stars were seen in the Milk stain ...
... No milky-way is seen. We conclude that we are not, therefore, in the disk of a galaxy. Instead, a vast collection of faint stars covers around 25% of the sky. We are calling it the Milk Stain. This could be an elliptical galaxy or a globular cluster. Several pulsing stars were seen in the Milk stain ...
Our Sun - STEMpire Central
... 1. The four measured aspects along each side, showing the direction of increasing value. 2. The regions on the diagram where one would find: white dwarfs, main sequence stars, giant stars, and supergiant stars. 3. Add and label the following stars: Our Sun (G2V), Sirius A (A1 V), Betelgeuse (M2 Iab) ...
... 1. The four measured aspects along each side, showing the direction of increasing value. 2. The regions on the diagram where one would find: white dwarfs, main sequence stars, giant stars, and supergiant stars. 3. Add and label the following stars: Our Sun (G2V), Sirius A (A1 V), Betelgeuse (M2 Iab) ...
Discussion Activity #10
... 2. Suppose star A has a parallax angle of 1/20 of an arcsecond and star B has a parallax angle of 1/40 of an arcsecond. What can you say about the relative positions of stars A and B? A. B. C. D. ...
... 2. Suppose star A has a parallax angle of 1/20 of an arcsecond and star B has a parallax angle of 1/40 of an arcsecond. What can you say about the relative positions of stars A and B? A. B. C. D. ...
Get ready for quiz # 7
... 14.6 The Mass of the Milky Way Galaxy The orbital speed of an object depends only on the amount of mass between it and the galactic center. ...
... 14.6 The Mass of the Milky Way Galaxy The orbital speed of an object depends only on the amount of mass between it and the galactic center. ...
ExpandUniv
... slope of the line now. If it’s really constant, then the age of the Universe is just 1/H [since H=v/D=(d/t)/d]. That’s because if you know how fast we are expanding, you can run the movie backwards and see when everything crunches together. If the Universe is slowing its expansion, you get a younger ...
... slope of the line now. If it’s really constant, then the age of the Universe is just 1/H [since H=v/D=(d/t)/d]. That’s because if you know how fast we are expanding, you can run the movie backwards and see when everything crunches together. If the Universe is slowing its expansion, you get a younger ...
ONLINE practice exam
... (a) What is the observed wavelength of the HI spectral line from this galaxy? (The rest wavelength is 21.1cm) (b) Use this information to estimate the Hubble constant. (c) Use this information to estimate the critical density. (d) Suppose that by measuring the motions of galaxies in the local Superc ...
... (a) What is the observed wavelength of the HI spectral line from this galaxy? (The rest wavelength is 21.1cm) (b) Use this information to estimate the Hubble constant. (c) Use this information to estimate the critical density. (d) Suppose that by measuring the motions of galaxies in the local Superc ...
SciNot Scale Metric 102
... To get the rate at which the pressure increases with depth: (1) Draw in a line that fits the data points the best (2) Get the coordinates of two arbitrary points on the line ...
... To get the rate at which the pressure increases with depth: (1) Draw in a line that fits the data points the best (2) Get the coordinates of two arbitrary points on the line ...
Herzsprung-Russell Diagram
... Only 6 of the 20 brightest stars in the sky are closer to us than 10pc 14 of the 20 brightest stars in the sky must have absolute magnitude of at least 1.5 (20 times brighter than the Sun) Out of the 6000 stars visible, only 50 are dimmer than the Sun in absolute ...
... Only 6 of the 20 brightest stars in the sky are closer to us than 10pc 14 of the 20 brightest stars in the sky must have absolute magnitude of at least 1.5 (20 times brighter than the Sun) Out of the 6000 stars visible, only 50 are dimmer than the Sun in absolute ...
The Universe and Galaxies - West Jefferson Local Schools
... 2. ________ (fig. 26-16, pg. 832) most ________ type of galaxy - spherical and ________ shaped NO spiral arms, little dust and gas - generally have ________ stars (reddish in color) - Range of sizes a. ________ - trillions of stars, millions of light years in diameter b. ________ - millions of ...
... 2. ________ (fig. 26-16, pg. 832) most ________ type of galaxy - spherical and ________ shaped NO spiral arms, little dust and gas - generally have ________ stars (reddish in color) - Range of sizes a. ________ - trillions of stars, millions of light years in diameter b. ________ - millions of ...
The Universe and Galaxies - West Jefferson Local Schools
... - ________ - grouping of millions or billions of stars, and dust and gas held together by gravity - there are an estimated ________ billion galaxies in the universe A. 3 Types of Galaxies - classified by ________ 1. ________ - disk shaped with spiral arms of dust and gas (fig 26-15, pg. 831) - dust ...
... - ________ - grouping of millions or billions of stars, and dust and gas held together by gravity - there are an estimated ________ billion galaxies in the universe A. 3 Types of Galaxies - classified by ________ 1. ________ - disk shaped with spiral arms of dust and gas (fig 26-15, pg. 831) - dust ...
Chapter 20 The Universe
... Sirius (Dog star) only 9 light years away Proxima Centauri (closest) 4.25 light yrs Other than sun Galaxy- large grouping of stars -our solar system is part of Milky Way Galaxy - what we see as the Milky Way is only the edge (spiral galaxy) ...
... Sirius (Dog star) only 9 light years away Proxima Centauri (closest) 4.25 light yrs Other than sun Galaxy- large grouping of stars -our solar system is part of Milky Way Galaxy - what we see as the Milky Way is only the edge (spiral galaxy) ...
Tutorial - TIL BIRNSTIEL
... where S is the solar flux (1360 W m−2 at the Earth’s distance), A is the albedo of the planet, σ is the Stefan-Boltzmann constant (5.67 × 10−8 W m−2 K−4 , in SI units) and f is a constant of order unity (assume f = 4 for the rest of the exercise, why?). • For an Earth albedo of 0.29, derive the habi ...
... where S is the solar flux (1360 W m−2 at the Earth’s distance), A is the albedo of the planet, σ is the Stefan-Boltzmann constant (5.67 × 10−8 W m−2 K−4 , in SI units) and f is a constant of order unity (assume f = 4 for the rest of the exercise, why?). • For an Earth albedo of 0.29, derive the habi ...
Chapter 26.4
... GALAXIES combined Quasars may be powered by SUPERMASSIVE black holes that “accrete” galaxies. ...
... GALAXIES combined Quasars may be powered by SUPERMASSIVE black holes that “accrete” galaxies. ...
Stars and Galaxies
... collection of stars, gas, and dust Earth’s galaxy is Milky Way which is part of a galaxy cluster named the Local Group Spiral galaxies—spiral arms wind out from inner section; some have barred spirals with stars and gas in a central bar Elliptical galaxies—large, three-dimensional ellipses; most ...
... collection of stars, gas, and dust Earth’s galaxy is Milky Way which is part of a galaxy cluster named the Local Group Spiral galaxies—spiral arms wind out from inner section; some have barred spirals with stars and gas in a central bar Elliptical galaxies—large, three-dimensional ellipses; most ...
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.