The Short,narrow Circular Arcs of Light That Seem to Surround

question 43

Multiple Choice

The short,narrow circular arcs of light that seem to surround some galaxies are caused by

• A) supernova explosions within the galaxies,the arcs representing parts of the shells of gas exploded outward by the supernova.
• B) gravitational lensing by the galaxies of the light from a single,distant object very far behind the galaxy.
• C) the shaping of regions of dense matter as it is attracted and condensed into the central black hole of the galaxies.
• D) blue gas clouds surrounding the galaxies.

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