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PART 4 Part 4: Test
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35 When astronomers talk about dark matter, they are referring to (a) clouds of dust in interstellar space (b) planets and moons in the Solar System (c) black-dwarf stars (d) asteroids, meteoroids, and comets that are too far from the Sun to glow (e) hypothetical cosmic stuff that has mass but cannot be seen 36 Fill in the blank in the following sentence: When a space ship moves at a speed approaching the speed of light relative to an observer, that observer will see a clock on the ship appear to ______ (a) run too fast (b) stop (c) run too slowly (d) run infinitely fast (e) run at normal speed 37 A distance of 1 Mpc is (a) 0001 parsec (b) 1,000 parsecs (c) 1 million parsecs (d) 1 billion parsecs (e) dependent on the angle at which it is measured 38 If a neutron star collapses to within its event horizon, (a) electromagnetic rays leaving the surface at low angles are trapped (b) electromagnetic rays cannot escape from the surface into outer space (c) it rebounds and explodes, causing a supernova (d) it disappears without a trace (e) No! A neutron star cannot collapse to within its event horizon 39 Suppose that an astronomer finds an object that looks like a glowing ball of stars, and its spectrum is significantly red-shifted The astronomer concludes that the object is (a) an elliptical galaxy (b) a quasar (c) a black hole (d) a globular cluster (e) an emission nebula 40 Globular star clusters are believed to be (a) galaxies far from the Milky Way (b) comprised of young stars (c) comprised of old stars (d) approaching us at high speed (e) receding from us at high speed
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PART 5
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Copyright 2003 by The McGraw-Hill Companies, Inc Click Here for Terms of Use
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Until a few hundred years ago, the only instrument available for astronomical observation was the human eye This changed in the 1600s when several experimenters, including such notables as Galileo Galilei and Isaac Newton, combined lenses and mirrors to make distant objects look closer Since then, optical telescopes have become larger and more sophisticated So have the ways in which the light they gather is scrutinized
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You have learned that visible light always take the shortest path between two points and that it always travels at the same speed These are the cornerstones of relativity theory and can be taken as axiomatic as long as the light stays in a vacuum However, if the medium through which light passes is significantly different from a vacuum, and especially if the medium changes as the light ray travels through it, these principles of relativity do not apply Let s focus our attention on what happens when light passes through a medium such as glass or is reflected by mirrors If a ray of light passes from air into glass or from glass into air, the path of the ray is bent Light rays change direction when they are reflected from mirrors This has nothing to do with relativity It happens all the time, everywhere you look It even takes place within your own eyes
Copyright 2003 by The McGraw-Hill Companies, Inc Click Here for Terms of Use
PART 5
Space Observation and Travel
LIGHT RAYS
What is a ray of light Definitions vary Informally, a thin shaft of light, such as that which passes from the Sun through a pinhole in a piece of cardboard, can be called a ray or beam of light In a more technical sense, a ray can be considered to be the path that an individual photon (light particle) follows through space, air, glass, water, or any other medium Light rays have properties of both particles and waves This duality has long been a topic of interest among physicists In some situations, the particle model or corpuscular model explains light behavior very well, and the wave model falls short In other scenarios, the opposite is true No one has actually seen a ray of light; all we can see are the effects produced when a ray of light strikes something Yet there are certain things we can say about the way in which rays of light behave These things are predictable, both qualitatively and quantitatively When we know these facts about light, we can build high-quality instruments for observing the Cosmos at visible wavelengths
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