Editing 2903: Earth/Venus Venn Diagram

{{comic
| number    = 2903
| date      = March 6, 2024
| title     = Earth/Venus Venn Diagram
| image     = earth_venus_venn_diagram_2x.png
| imagesize = 416x309px
| noexpand  = true
| titletext = Actually, the fact that Mars is still orbiting safely over here means that it was technically an *Euler* apocalypse, not a Venn one.
}}

==Explanation==
{{incomplete|Created by a PLANETARY IMPACT OF EARTH ∩ VENUS - Please continue to expand the description. Do NOT delete this tag too soon.}}
This comic appears to be a {{w|Venn diagram}} depicting {{w|Earth}} and {{w|Venus}}. A Venn diagram would be used to compare the two and show separate distinct traits that each has as well as, in the middle area, traits common to both planets.  However, on reading the text, it becomes clear that the "diagram" actually depicts Earth ''colliding'' with Venus, as each of the circles in the diagram could be construed as the planets.  The central label of "shockwaves and production of impact ejecta" is exactly what would be present in such a collision at the area of contact.{{Citation needed}}  The sizes of the two circles also match the relative sizes of the two planets, since Earth and Venus have about the same size.

The title text continues the comparison by pointing out that {{w|Mars}} is part of the diagram, but presumably orbiting safely (just that we can't see it). Therefore, this makes the overall system an {{w|Euler diagram}} rather than a Venn one, as every circle in any way represented in a Venn diagram must intersect. xkcd has referenced the difference between Euler and Venn diagrams [[2721: Euler Diagrams|before]]. The title text also calls it an "Euler apocalypse" to emphasize that it represents an important event rather than the sets of traits that either type of diagram normally represents. Going off of this, a "Venn apocalypse" would consist of every (present) spherical body in the universe colliding simultaneously.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:Caption above the diagram: Earth/Venus Venn Diagram
:[A Venn diagram with overlapping parts of the two circles in dashed lines. The circle on the left is labeled "Earth", the circle on the right is labeled "Venus" and the overlapping area is labeled "Shock-waves and production of impact ejecta".]

{{comic discussion}}

[[Category:Venn diagrams]]
[[Category:Astronomy]]
[[Category:Euler diagrams]]
@@ Line 10: / Line 10: @@
 ==Explanation==
-A {{w|Venn diagram}} illustrates the relationships and differences among sets by showing common and distinct elements, using overlapping circles (or other shapes). This comic is both a '''Venn diagram''' and a '''proximity illustration''' of {{w|Earth}} and {{w|Venus}} colliding, physically 'overlapping' each other.
+{{incomplete|Created by a PLANETARY IMPACT OF EARTH ∩ VENUS - Please continue to expand the description. Do NOT delete this tag too soon.}}
-* As a '''proximity illustration''', it depicts Earth and Venus smashing into each other, resulting in "shockwaves and production of impact ejecta" occurring where they collide. The relative circle sizes are accurate; the circumference of Venus is 5% smaller than Earth's.
+This comic appears to be a {{w|Venn diagram}} depicting {{w|Earth}} and {{w|Venus}}. A Venn diagram would be used to compare the two and show separate distinct traits that each has as well as, in the middle area, traits common to both planets.  However, on reading the text, it becomes clear that the "diagram" actually depicts Earth ''colliding'' with Venus, as each of the circles in the diagram could be construed as the planets.  The central label of "shockwaves and production of impact ejecta" is exactly what would be present in such a collision at the area of contact.{{Citation needed}}  The sizes of the two circles also match the relative sizes of the two planets, since Earth and Venus have about the same size.
-* As a '''Venn diagram''', it shows a collision moment in which the commonality between Earth and Venus is "shockwaves and production of impact ejecta" at the spot of intermingled Earth-Venus overlap.
-'''Shockwaves''' are intense, high-pressure waves caused by the immense force of the impact, that propagate through the materials of both planets faster than the speed of sound.
+The title text continues the comparison by pointing out that {{w|Mars}} is part of the diagram, but presumably orbiting safely (just that we can't see it). Therefore, this makes the overall system an {{w|Euler diagram}} rather than a Venn one, as every circle in any way represented in a Venn diagram must intersect. xkcd has referenced the difference between Euler and Venn diagrams [[2721: Euler Diagrams|before]]. The title text also calls it an "Euler apocalypse" to emphasize that it represents an important event rather than the sets of traits that either type of diagram normally represents. Going off of this, a "Venn apocalypse" would consist of every (present) spherical body in the universe colliding simultaneously.
-'''Impact ejecta''' are the materials expelled from the impact site, consisting of molten rock, vaporized material, and solid debris, flung out at high velocities due to the energy released by the collision. The production of impact ejecta would indeed occur in the overlapping impact area.
-The title text is [[2721: Euler Diagrams|another xkcd joke]] about the difference between a [[:Category:Venn diagrams|Venn]] diagram and an [[:Category:Euler diagrams|Euler]] diagram, which is similar to a Venn diagram except that it's acceptable to have circles (or other shapes) that do not intersect if there are no common elements between those sets. The observation that {{w|Mars}} is still orbiting by itself makes Mars an additional set (out of the frame of the diagram), in addition to - but not intersecting with - Earth and Venus, making this technically an {{w|Euler diagram}}. Therefore if the Earth-Venus collision is a "Venn apocalypse," the inclusion of Mars as a non-intersecting entity makes this technically an "Euler apocalypse."
-As a thought experiment, if you expand the diagram infinitely, a "{{w|Big Crunch|Venn apocalypse}}" would consist of every body in the universe being in the process of colliding, simultaneously. This would be very dangerous.{{Citation needed}}
-===Similar jokes===
-This joke is similar to the 'Pie chart' meme, showing 'pie I have eaten' and 'pie I have not yet eaten' as a mathematically conventional pie chart formed by a photograph of the actual subject of the chart: a real-world partially-eaten pie.
 ==Transcript==
-:[Two circles are drawn so they overlap. The segments of the circles that overlap are drawn in dashed lines. Each circle has a label and text are written in the central overlapping part the circle. Above the circles there is a caption:]
+{{incomplete transcript|Do NOT delete this tag too soon.}}
-:Earth/Venus Venn Diagram
+:Caption above the diagram: Earth/Venus Venn Diagram
-:Left: Earth
+:[A Venn diagram with overlapping parts of the two circles in dashed lines. The circle on the left is labeled "Earth", the circle on the right is labeled "Venus" and the overlapping area is labeled "Shock-waves and production of impact ejecta".]
-:Right: Venus
-:Center: Shock-waves and production of impact ejecta
 {{comic discussion}}