Bartleby Sitemap - Textbook Solutions
All Textbook Solutions for Conceptual Physical Science Explorations
What is a Cepheid?3RQWhat type of galaxy is the Milky Way?5RQWhat is a starburst galaxy?7RQHow many spiral galaxies are within the Local Group?Is the Local Group a relatively small or large cluster of galaxies?10RQ11RQIs the universe in space or is space in the universe?According to the cosmic background radiation, what is the average temperature of the universe today?The universe is about 25 helium. From where did most of the helium come?15RQIf we cant see dark matter, how do we know it is there?Is dark matter found mostly within or just outside a galaxy?Did Einstein first believe that the universe was static or dynamic?What was Einsteins cosmological constant?What is likely the major component of our universe?Rank the following in order of increasing size: cluster, supercluster, galaxy, solar system.Rank the following galaxy types in order of increasing transparency: elliptical, spiral, irregular.Rank the following in order of increasing energy output: spiral galaxy, supernova, active galactic nucleus.Rank the following in order of increasing distance from Earth: the Andromeda galaxy, the Virgo cluster, the nearest void.Rank the following in order of increasing abundance: dark energy, ordinary matter, dark matter.Are there galaxies other than the Milky Way that can be seen with the unaided eye? Discuss.2TE3TE4TEDoes the collision of two galaxies involve the collisions of many, many stars?6TE7TEWhat is the difference between the universe and the observable universe?9TE10TEWhy should anyone care about how the universe is organized? After all, how could galaxies and the like possibly have an impact on our daily living?Are astronomers able to point their telescopes in the direction of where the Big Bang occurred?If the initial universe remained hotter for a longer period of time, would there likely be more or less helium?No galaxy found so far is made of less than 25 helium. If not from the stars, where did this helium come from?A helium balloon here on Earth pops, releasing direct remnants of the Big Bang. True or false? Explain.Early astronomers such as Kepler and Newton developed the laws of gravity based upon the motion of the planets around the Sun. How might these laws have been different if our solar system had been surrounded by a thick halo of dark matter?If dark matter is affected by gravity, might there be lots of it surrounding us here on the surface of the Earth?A police officer pulls you over speeding. He tells you that his radar tracked you moving at a rate of 45mph away from his parked police car. Were you really speeding away from him or was the space between the two of you simply expanding?19TEIf we cant even predict the weather, how can we ever expect to predict the fate of the universe?If you were to travel straight up from the core of our galaxy and then look back, you would have a grand view of the Milky Ways spiral shape. If the distance from the core to the outer edges was 50,000light-years, how much surface area are you looking at? Assume the galaxy to be a circle whose area can be found by the equation area=r2.2TS3TSScientists estimate the age of universe to be about (a) 5000 years old. (b) 1 billion years old. (c) 14 billion years old. (d) 42 billion years old.Starburst galaxies (a) tend to be spiral. (b) produce hundreds of stars per year. (c) have jets coming from an active galactic nucleus. (d) are noted for their supermassive black holes.3RATWhich of the following is not accepted evidence for the Big Bang? (a) Cosmic background radiation (b) The nearly uniform temperature of the universe (c) The abundance of helium (d) Dark energyEdwin Hubble is famous for (a) building the first telescope. (b) discovering the nature of Cepheids. (c) discovering Cepheids in the Andromeda nebula. (d) determining the mass of the Milky Way Galaxy.The average temperature of the universe right now is about 2.73K. Over the next billion years this temperature will likely (a) go down because of expansion. (b) go down because space is very cold. (c) remains constant because matter and energy cannot be destroyed. (d) increase because of the gravitational attractions among superclusters.7RAT8RATIn a huge cloud ordinary and dark matter are uniformly mixed together. Over time, the ordinary matter becomes concentrated toward the center of this cloud because ordinary matter (a) slows down as ordinary matter particles collide. (b) experiences a strong gravitational pull. (c) is lighter than dark matter. (d) is not affected by dark energy.10RAT