Galaxies and Their Structure
... its component stars added together If a galaxy is moving toward or away from us its spectral lines will be Doppler-Shifted-e.g. motion away from us lengthens the wavelength Nearly all galaxies are moving away Hubble discovered in 1920 that V = HD where H is the Hubble Constant = 65 km/s per Mpc Thus ...
... its component stars added together If a galaxy is moving toward or away from us its spectral lines will be Doppler-Shifted-e.g. motion away from us lengthens the wavelength Nearly all galaxies are moving away Hubble discovered in 1920 that V = HD where H is the Hubble Constant = 65 km/s per Mpc Thus ...
expanding universe
... distant supernova, astronomers from two rival research teams have jointly gathered the strongest evidence yet that the expansion of the universe is actually speeding up. (Para. 2) ...
... distant supernova, astronomers from two rival research teams have jointly gathered the strongest evidence yet that the expansion of the universe is actually speeding up. (Para. 2) ...
Critical Thinking
... Captain P. Nutt: It may sound silly, but imagine constantly seeing pools of water in a hot desert only to find out there really is no water. It is enough to drive anyone nuts! Kara Little: What causes these illusions? Captain P. Nutt: Changes in air temperature cause changes in air density. Mirages ...
... Captain P. Nutt: It may sound silly, but imagine constantly seeing pools of water in a hot desert only to find out there really is no water. It is enough to drive anyone nuts! Kara Little: What causes these illusions? Captain P. Nutt: Changes in air temperature cause changes in air density. Mirages ...
1 - Stars: Introduction
... • The mass of our Sun is 1.99 × 1030 kg = 1 solar mass, M¤ • The mass of the Milky Way is larger than 2 × 1011 M¤ • 10% of the mass is interstellar gas • 0.1% is dust (typically par)cles with diameter ...
... • The mass of our Sun is 1.99 × 1030 kg = 1 solar mass, M¤ • The mass of the Milky Way is larger than 2 × 1011 M¤ • 10% of the mass is interstellar gas • 0.1% is dust (typically par)cles with diameter ...
powerpoint
... Clusters of Galaxies • In 20’s, Zwicky pointed out that the velocity dispersion of the Coma cluster is inconsistent with its self-gravity • One expects v2=GM/R, the mass inferred this way is 100 times larger than the inferred stellar mass ...
... Clusters of Galaxies • In 20’s, Zwicky pointed out that the velocity dispersion of the Coma cluster is inconsistent with its self-gravity • One expects v2=GM/R, the mass inferred this way is 100 times larger than the inferred stellar mass ...
Any two colors that combine to form white light are called
... parallel to the optical axis pass through a convex lens, they are bent toward the center of the lens. The rays meet at the focal point of the lens and continue to travel beyond. The more curved the lens, the more it refracts light. An object’s position relative to the focal point determines whether ...
... parallel to the optical axis pass through a convex lens, they are bent toward the center of the lens. The rays meet at the focal point of the lens and continue to travel beyond. The more curved the lens, the more it refracts light. An object’s position relative to the focal point determines whether ...
year group: 5 - Priory Fields School, Dover
... paper of a square when the square shape is moved a particular distance towards the torch. ...
... paper of a square when the square shape is moved a particular distance towards the torch. ...
Optics
... angle. At the back surface of the droplet, the light undergoes total internal reflection. On the way out of the droplet, the light is once more refracted and dispersed. Although each droplet produces a complete spectrum, an observer will only see a certain wavelength of light from each droplet. (The ...
... angle. At the back surface of the droplet, the light undergoes total internal reflection. On the way out of the droplet, the light is once more refracted and dispersed. Although each droplet produces a complete spectrum, an observer will only see a certain wavelength of light from each droplet. (The ...
optics
... angle. At the back surface of the droplet, the light undergoes total internal reflection. On the way out of the droplet, the light is once more refracted and dispersed. Although each droplet produces a complete spectrum, an observer will only see a certain wavelength of light from each droplet. (The ...
... angle. At the back surface of the droplet, the light undergoes total internal reflection. On the way out of the droplet, the light is once more refracted and dispersed. Although each droplet produces a complete spectrum, an observer will only see a certain wavelength of light from each droplet. (The ...
Define and Discuss Geometrical Optics
... The constant ( n) is called the index of refraction and depends only upon the optical properties of the material. The index of refraction gives a measure of the amount of bending occurring when light travels from air into the material. It is a dimensionless number and can be located in tables of pro ...
... The constant ( n) is called the index of refraction and depends only upon the optical properties of the material. The index of refraction gives a measure of the amount of bending occurring when light travels from air into the material. It is a dimensionless number and can be located in tables of pro ...
Solution key
... E. The Solar System ___C___9. A star moves horizontally and to the right on an HR diagram. Which is true? A. Surface temperature decreases and radius decreases B. Surface temperature increases and radius decreases C. Surface temperature decreases and radius increases D. Surface temperature increases ...
... E. The Solar System ___C___9. A star moves horizontally and to the right on an HR diagram. Which is true? A. Surface temperature decreases and radius decreases B. Surface temperature increases and radius decreases C. Surface temperature decreases and radius increases D. Surface temperature increases ...
What constitutes the dark matter?
... • 1931 Jan Oort Leiden: motions in our galaxy are “too fast” • perpendicular to galactic plane: stars should escape • In the plane: stars should escape from their elliptic orbit • Explanation: there is more matter than we see: dark matter ...
... • 1931 Jan Oort Leiden: motions in our galaxy are “too fast” • perpendicular to galactic plane: stars should escape • In the plane: stars should escape from their elliptic orbit • Explanation: there is more matter than we see: dark matter ...
Gravitational and Anti-gravitational Applications
... Because that universal outward Flow originates at each particle and flows radially outward in all directions its density or concentration decreases inversely as the square of distance from the source of the Flow. At a large distance from the source the wave front of a very small portion of the total ...
... Because that universal outward Flow originates at each particle and flows radially outward in all directions its density or concentration decreases inversely as the square of distance from the source of the Flow. At a large distance from the source the wave front of a very small portion of the total ...
Measuring the Distances to the Stars: Parallax What sets the parallax limit? 1
... • Change in size • change in temperature • change in luminosity ...
... • Change in size • change in temperature • change in luminosity ...
Physical Science 2nd Semester Study Guide
... 44. What happens to the particles in a medium when sounds pass through it? They vibrate 45. How is wave speed calculated? Wavelength x frequency 46. What would you measure to determine a wave’s frequency? The number of waves that pass a given point in a second 47. A lightning flash produces thunder ...
... 44. What happens to the particles in a medium when sounds pass through it? They vibrate 45. How is wave speed calculated? Wavelength x frequency 46. What would you measure to determine a wave’s frequency? The number of waves that pass a given point in a second 47. A lightning flash produces thunder ...
Galaxies Galore
... Go to p. 7 links: Galaxies – Planetquest (http://planetquest.jpl.nasa.gov/interactives) Scroll down to “3D Guide to the Galaxy” Click on: Launch Interactive (You may want to Mute sound) 1. “How Big? “ If our solar system were the size of a quarter, the galaxy would be __________. 2. How large is the ...
... Go to p. 7 links: Galaxies – Planetquest (http://planetquest.jpl.nasa.gov/interactives) Scroll down to “3D Guide to the Galaxy” Click on: Launch Interactive (You may want to Mute sound) 1. “How Big? “ If our solar system were the size of a quarter, the galaxy would be __________. 2. How large is the ...
