How do we measure Dark Matter?
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How do we measure Dark Matter?
Step by step
Solved in 4 steps
- Choose the BEST answer to the following: If a star that is 20 light-years from Earth explodes, gravitational waves from the explosion would reach Earth in (a) less than 20 years. (b) 20 years. (c) more than 20 years. (d) None of these.What is the order of objects to form from first to last after the Big Bang nuclei,neutral Atoms, protons?The Perseus-pices supercluster of galaxies is 64 Mpc from Earth. How long (in years) does it take light from the supercluster to reach Earth?
- When you look at distant galaxy through a telescope, how is it that you are looking backward in time?It is year 2120 and we have figure out a propulsion system that allows 0.87c. A first expedition to spaceships travel at velocities as high as v %3D Alpha Centauri (the nearest planetary system) is being planned. Alpha Centauri is 4.3 ly away. Answer the following 5 questions below asking you about the details of this expedition.3 4 Suppose that someone in the Andromeda galaxy had a super-telescope through which they were looking at Earth right now. They would see Earth A B C D B As it was about 2 ½ million years ago C As it was about 100,000 years ago Which of the following statements about stellar parallax is true? As it will be about 2 ½ million years from now A We observe all stars to exhibit at least a slight amount of parallax. E As it is right now Stellar parallax was first observed by ancient Greek astronomers. The amount of parallax we see depends on how fast a star is moving relative to us. D It takes at least 10 years of observation to measure a star's parallax. The closer a star is to us, the more parallax it exhibits.