# Chapter 13. Quasars

Map Learning Exercises

### Question Which portions of this object can be detected by astronomers?

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{"title":"magnetic","description":"Are there other parts of the black hole that we can detect?","type":"correct","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"90,178,93,179\"},{\"shape\":\"poly\",\"coords\":\"103,165,179,114,485,101,488,286,169,269,104,217\"},{\"shape\":\"poly\",\"coords\":\"2,126,4,252,55,221,55,146\"}]"} {"title":"accretion","description":"Are there other parts of the black hole that we can detect?","type":"correct","color":"#ffffff","code":"[{\"shape\":\"poly\",\"coords\":\"81,49,61,81,60,291,72,322,90,290,93,78\"}]"}
Correct.

### Question Understanding Einstein's Cross

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{"title":"center","description":"Huchra's Lens, a small galaxy, sits so perfectly aligned with a distant quasar that the galaxyâ€™s gravitational field bends and splits the light from the quasar into four separate images around itself, forming what is called an Einstein Cross.","type":"correct","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"90,178,93,179\"},{\"shape\":\"circle\",\"coords\":\"257,245,20\"}]"} {"title":"outer","description":"This is one of the images that we see of the quasar. (We see four of them.) Huchra's Lens is the small galaxy that bends the light causing this strange effect. Try again.","type":"incorrect","color":"#ffffff","code":"[{\"shape\":\"circle\",\"coords\":\"241,192,16\"},{\"shape\":\"circle\",\"coords\":\"208,256,16\"},{\"shape\":\"circle\",\"coords\":\"251,301,17\"},{\"shape\":\"circle\",\"coords\":\"308,243,13\"}]"}
Correct.

### Question Redshifting Quasars

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{"title":"purple","description":"Try again.","type":"incorrect","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"90,178,93,179\"},{\"shape\":\"rect\",\"coords\":\"48,40,81,328\"}]"} {"title":"blue","description":"Try again.","type":"incorrect","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"90,178,93,179\"},{\"shape\":\"rect\",\"coords\":\"79,40,112,328\"}]"} {"title":"green","description":"Try again.","type":"incorrect","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"90,178,93,179\"},{\"shape\":\"rect\",\"coords\":\"121,40,195,328\"}]"} {"title":"orange","description":"Try again.","type":"incorrect","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"90,178,93,179\"},{\"shape\":\"rect\",\"coords\":\"202,40,267,328\"}]"} {"title":"red","description":"Correct","type":"correct","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"90,178,93,179\"},{\"shape\":\"rect\",\"coords\":\"268,40,333,328\"}]"} {"title":"infrared1","description":"Try again.","type":"incorrect","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"90,178,93,179\"},{\"shape\":\"rect\",\"coords\":\"332,40,397,328\"}]"} {"title":"infrared2","description":"Try again.","type":"incorrect","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"90,178,93,179\"},{\"shape\":\"rect\",\"coords\":\"400,42,465,330\"}]"}
Correct.