Each part of this question covers a key concept. Each requires at most a few sen
ID: 283948 • Letter: E
Question
Each part of this question covers a key concept. Each requires at most a few sentences to answer: some are much shorter. Please be concise. (a) The following image was released to commemorate the sixth anniversary of the Hubble Space Telescope. It shows several blue, loop-shaped objects that are actually multiple images of the same background galaxy. These images surround a cluster of yellow elliptical and spiral galaxies near the image's center. Assuming that the distances from Earth to the cluster and background galaxy are known, what properties of the cluster and the background galaxy can we determine based on the image? (b) What evidence suggests that MACHOs comprise at most a small fraction of the dark matter?Explanation / Answer
a) The image can be used to measured the position and brightnesses of the Galaxies in the image whereas the background galaxies going in the readshifts both form the cluster and the background galaxies can be used as the information to prepare an map of the mass distribution in the given image cluster.
b) Dark matter are not yet been well understood ,does it emit or absorb light. MACHOs or Massive Compact Halo Objects is an brown dwarfs in which the mass of the star is one twentieth of our sun and it is not enough hot to burn hydrogen or deuterium and they shine by the action of the gravitational contraction, their luminosity is between the star and the planets and they are not easily detectable by our telescopes, this can be detectable by gravitational lensing experiment.
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