Editing 2135: M87 Black Hole Size Comparison

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| number    = 2135
 
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| date      = April 10, 2019
 
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| title    = M87 Black Hole Size Comparison
 
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| image    = m87_black_hole_size_comparison.png
 
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| titletext = I think Voyager 1 would be just past the event horizon, but slightly less than halfway to the bright ring.
 
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}}
 
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==Explanation==
 
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This comic shows the picture of the {{w|Messier_87#Supermassive black hole|M87 black hole}} by the {{w|Event Horizon Telescope}} that was published on the same day as this comic. Overlaid on the picture is a scale image of the Solar System, showing the Sun, Pluto (one of the most well-known {{w|dwarf planet}}s) and its orbital path, and {{w|Voyager 1}}, a deep-space probe and the current farthest probe from Earth. The comic is quite similar to [[1551: Pluto]], in which Randall overlaid annotations onto the recently-released first images of Pluto taken by the New Horizons spacecraft.
 
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The point of the comic is to celebrate the release of this image by the Event Horizon Telescope, referenced two comics earlier, in [[2133: EHT Black Hole Picture]], as well as to indicate the hugeness of M87 and the awe-inspiring thing that space is.  This image has been widely publicized as being the first image ever of a black hole.  Science had no visual evidence of black holes at all [https://www.space.com/16411-black-hole-photo-nasa-telescope.html until 2012].
 
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In the title text Randall hypothesizes that if the Sun were at the center of M87, Voyager would be outside the event horizon. This is confirmed by a 2015 [https://arxiv.org/abs/1505.03545 study] in which the Schwartzchild radius of M87* was found to be 5.9x10^-4 pc, as opposed to the distance of 7.04x10^-4 pc, at the time the comic was written, between Voyager 1 and the Sun.
 
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The comic's scale seems to be slightly small; while the orbit of Pluto should be about 4.9 microarcseconds across, in the comic it's about 3.9 microarcseconds across.
 
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==Transcript==
 
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:[Caption above the panel:]
 
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:Size comparison:
 
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:'''The M87 Black Hole'''
 
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:and
 
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:'''Our Solar System'''
 
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:[Caption at top left of the panel:]
 
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:EHT Black Hole Image
 
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:Source: NSF
 
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:[An image of the M87 black hole captured by the event horizon telescope on the day that this comic was published is shown, in the shape of a thick red-and-yellow ring on a black background.]
 
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:[A white ring about 1/4 of the diameter of the central black portion of the image is labelled with an arrow:]
 
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:Pluto
 
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:[A small white circle at the center of the image is labelled with an arrow:]
 
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:Sun
 
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:[A small white dot on the right hand edge of the central black portion of the image is labelled with an arrow:]
 
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:Voyager 1
 
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{{comic discussion}}
 
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[[Category:Comics with color]]
 
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[[Category:Comics with inverted brightness]]
 
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[[Category:Astronomy]]
 
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[[Category:Space]]
 

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