14) Which of the following best sums up current scientific thinking about the nature of dark matter? 25) Why can't the dark matter in galaxies be made of neutrinos? For a given value of Hubble's constant today (such as 24 km/s/Mly), the age of the universe is oldest if what is true? 15) When we speak of the large-scale structure of the universe, we mean 17) What is the primary form of evidence that has led astronomers to conclude that the expansion of the universe is accelerating? 13) What do we mean when we say that particles such as neutrinos or WIMPs are weakly interacting?
D) Dark energy exists but dark matter does not. Dark matter cannot be seen directly with telescopes; evidently it neither emits nor absorbs light or other electromagnetic radiation at any significant level. A type of matter hypothesized to account for a large part of the total mass in the universe. 3) The text states that luminous matter in the Milky Way seems to be much like the tip of an iceberg. 16) Hubble's constant is related to the age of the universe, but the precise relationship depends on the way in which the expansion rate changes with time. 15) Which of the following methods used to determine the mass of a cluster does not depend on Newton's laws of gravity?
And dark matter’s influence shows up even in individual galaxies, while dark energy acts only on the scale of the entire universe Our universe may contain 100 billion galaxies, each with billions of stars, great clouds of gas and dust, and perhaps scads of planets and moons and other little bits of cosmic flotsam. 13) Based on current evidence, how does the actual average density of matter in the universe compare to the critical density? 12) Based on current evidence, a supercluster is most likely to have formed in regions of space where 14) Which of the following statements best describes the current state of understanding regarding the apparent acceleration of the expansion of the universe? 5) What evidence suggests that the Milky Way contains dark matter? 17) Imagine that it turns out that dark matter (not dark energy) is made up of an unstable form of matter that decays into photons or other forms of energy about 50 billion years from now. This refers to the idea that 8) In general, when we compare the mass of a galaxy or cluster of galaxies to the amount of light it emits (that is, when we look at it mass-to-light ratio), we expect that9) Which of the following is not one of the three main strategies used to measure the mass of a galaxy clusters? 28) Why isn't space expanding within systems such as our solar system or the Milky Way?
The Universe is full of matter and the attractive force of gravity pulls all matter together. 24) What do we mean when we say that a particle is a weakly interacting particle? 7) Why does the temperature of the gas between galaxies in galaxy clusters tell us about the mass of the cluster? 16) Why wasn't the intracluster medium in galaxy clusters discovered until the 1960s? The density of dark matter in an expanding universe decreases more quickly than dark energy, and eventually the dark energy dominates. Granted, the slowing had not been observed, but, theoretically, the Universe had to slow.
8) How does gravitational lensing tell us about the mass of a galaxy cluster? We know because we would be able to detect baryonic clouds by their absorption of radiation passing through them.No, it is not antimatter/ We do not see the unique gamma rays that are produced when antimatter annihilates with matter.In the early 1990's, one thing was fairly certain about the expansion of the Universe.
2) Which of the following best summarizes what we mean by dark energy? Dark matter cannot be seen directly with telescopes; evidently it neither emits nor absorbs light or other electromagnetic radiation at any significant level.Is dark matter a form of dark clouds of normal matter/No, it is not bayrons, a type of particle. Based on current understanding, how would that affect the universe at that time? B) Dark energy does not exist and there is much more dark matter than we are aware of to date.
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