Each part of this question covers a key concept. Each requires at most a few sen

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. 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? What evidence suggests that MACHOs comprise at most a small fraction of the dark matter?

Explanation / Answer

hot X-ray- emitting gas and large amounts of dark matter.

(b)  gravitational lensing

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