Quasars,double-Radio Sources,and BL Lacertae Objects May Well Be the Same

question 236

Multiple Choice

Quasars,double-radio sources,and BL Lacertae objects may well be the same kind of object.The difference in their appearance is simply that:

• A) their position in the universe is different: Quasars are in the Milky Way Galaxy, double-radio sources are associated with other galaxies, and BL Lacertae objects are in the vast voids of space between galaxies.
• B) the orientation of our line of sight to the axis of their ejected jets of matter is different.
• C) their ages are different: BL Lacertae objects evolving through the double-radio source phase end as quasars.
• D) their sizes are different: Quasars are star-sized, double-radio sources are larger, and BL Lacertae objects are galaxy-sized.

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