Talk:195: Map of the Internet

2022-11-12T04:56:51Z

MegaMutant453:

If one ip address was a square of area 100 by 100 ft, this entire map would be 1241 miles across, for a total area of 1.541 million square miles. That's about 41% the area of the United States, the size of a medium-to-large country. The ipv6 map would be half the size of the galaxy. [[User:MegaMutant453|MegaMutant453]] ([[User talk:MegaMutant453|talk]]) 04:56, 12 November 2022 (UTC)

Why am I in various registrars?[[Special:Contributions/141.101.104.186|141.101.104.186]]
: Simply because one of those various registrars is your interwebz provider. [[User:Sobsz|Sobsz]] ([[User talk:Sobsz|talk]]) 19:55, 21 November 2015 (UTC)

I'd like to see an updated version, 10 years later. I think all the green would be gone. [[User:Microbe|Microbe]]

He forgot the 172.16-172.31 private block. Way late, I know but I only just noticed. [[Special:Contributions/172.68.253.203|172.68.253.203]] 01:51, 7 July 2017 (UTC)

Since the table is for the first octet only, it's not possible to show the 172.16-172.31 block. Drawing a table big enough is left to you as an exercise. However, he shows Class E addresses (240-255) as "unallocated", which is a bit misleading because routers are required by [https://tools.ietf.org/html/rfc1812#section-5.3.7 RFC 1812] to discard packets with these addresses, which are reserved for "future use". [[Special:Contributions/172.68.142.89|172.68.142.89]] 18:21, 15 June 2018 (UTC)
:However, 10.0.0.0/8 is a full class A subnet that is on the same footing as 172.16.0.0/12 and 192.168.0.0/16, yet is labeled "VPNs" in this comic. [[Special:Contributions/172.68.59.144|172.68.59.144]] 21:35, 28 April 2019 (UTC)

893: 65 Years

2022-11-12T01:28:49Z

MegaMutant453:

{{comic
| number = 893
| date = May 2, 2011
| title = 65 Years
| image = 65 years.png
| titletext = The universe is probably littered with the one-planet graves of cultures which made the sensible economic decision that there's no good reason to go into space--each discovered, studied, and remembered by the ones who made the irrational decision.
}}
==Explanation==
[[Randall]] is showing the number of still living humans who have walked on another world for the 65-year period that begins in 1969 (when a human first walked on the moon). Up to 2011 (when the comic was drawn), he has drawn a single line for the actual figures.

For the subsequent years, he has drawn three lines using {{w|actuarial table}}s or life tables (such tables show, for each age, the probability that a certain person will die within the next year).

The line marked "5th Percentile" indicates that there is a 95% probability that the number alive in a given year will be above that line and a 5% probability that the number alive will be below that line. For example, this line indicates a 5% chance that all Apollo moon walkers will be dead by 2023, and a 95% chance that at least one will still be alive by that year.

The line marked "95th Percentile" indicates that there is a 5% probability that the number alive in a given year will be above that line and a 95% probability that the number alive will be below that line. For example, this line indicates a 95% chance that all Apollo moon walkers will be dead by 2035, and a 5% chance that at least one will still be alive by that year.

The middle line is not identified, but is probably the "50th Percentile" (see [http://blog.xkcd.com/2012/07/12/a-morbid-python-script/ these tables]). If so, it indicates that there is a 50% probability that the number alive in a given year will be above that line and a 50% probability that the number alive will be below that line. For example, this line indicates a 50% chance that all Apollo moon walkers will be dead by 2028 (see previous link), and a 50% chance that at least one will still be alive by that year.

Although the term ''other world'' would include all other worlds on which humans have walked, there is currently only one other world on which humans have walked, which is the moon. The humans that have walked there are the 12 {{w|List of Apollo astronauts#Apollo astronauts who walked on the Moon|Apollo astronauts}} who landed on the Moon between 1969 and 1972.

In particular, {{w|Neil Armstrong}} and {{w|Buzz Aldrin}} landed in July 1969. {{w|Pete Conrad}} and {{w|Alan Bean}} landed in November. {{w|Alan Shepard}} and {{w|Edgar Mitchell}}: February 1971. {{w|David Scott}} and {{w|James Irwin}}: July 1971. {{w|John Young (astronaut)|John Young}} and {{w|Charles Duke}}: April 1972. {{w|Eugene Cernan}} and {{w|Harrison Schmitt}}: December 1972.

Irwin died in 1991. Shepard and Conrad died in 1998 and 1999 respectively, making the total 9 as of the date this comic was published. Since then Armstrong died in 2012, Mitchell in 2016, Cernan in 2017, Young on January 6, 2018, and Bean on May 26, 2018. The current (as of September 2022) number is 4, which lies close to the middle line (the supposed 50th Percentile). The oldest living person to have landed on the moon is Aldrin at 91. Also living are Scott at 88, Schmitt at 85, and Duke at 85.

The chart assumes that no other humans will go to walk on another world within the time-frame plotted and the title text implies that this is primarily an economically determined decision. While noting that not exploring space is a justifiable and sensible decision which may also be made by many hypothetical cultures on other worlds, the text implies a grandness to a civilization that would be given the opportunity to discover, study and memorialize the 'one-world graves' of other civilizations by choosing to explore space despite the economic difficulty. This also implies that the likely consequence of not exploring space is that a civilisation which chooses to do this is doomed to go extinct eventually while those which do explore and colonise may last long enough to be safely established on multiple worlds and discover the remains of civilisations which acted on a purely economic basis and hence ensured their own collapse. High five for exoplanet archaeology.

==Transcript==
:[A graph titled 'Number of Living Humans Who Have Walked on Another World' - its y-axis is numbered 5, 10, 15, its x-axis increments every ten years from 1960-2040. The line of the graph has a bracket above it that says '65 Years', starting at 1969, ending in 2034.
:The line starts at 1969 and increases steeply to 12 by 1972. It then plateaus until the early nineties, declines gradually to 9 between 1991-1999, and then plateaus again.
:From 2011-2035, which is labeled 'Projected Actuarial Tables', the line branches into three and begins to decline more steeply to zero. The area between the first and second branch is shaded and labeled '5th percentile' and the area between the second and third branch is shaded and labeled '95th percentile.']

==Trivia==
*The theme of actuarial projections was explored earlier in [[493: Actuarial]]; Randall's morbid python script for both was given in [http://blog.xkcd.com/2012/07/12/a-morbid-python-script/ the blag].
{| class="wikitable"
|+Table of men who walked the moon
|- style="background:#ccc;"
| style="width:20px;"|
| '''Name'''
| '''Born'''
| '''Died'''
| '''Age at<br>first step'''
| '''Age at death'''
| '''Mission'''
| '''Lunar dates'''
| '''Service'''
| '''Alma Mater'''
|- style="background:#def;"
| 1. || {{w|Neil Armstrong}}|| 1930-08-05 || 2012-08-25 || 38y 11m 15d || 82y 0m 20d
|rowspan="2"| {{w|Apollo 11}} ||rowspan="2"| July 21, 1969 || {{w|NASA}} || {{w|Purdue University}}, {{w|University of Southern California}}
|- style="background:#def;"
| 2. || {{w|Buzz Aldrin}}|| 1930-01-20 || || 39y 6m 0d || || {{w|United States Air Force|Air Force}} || {{w|United States Military Academy}}, {{w|MIT}}
|- style="background:#ffe8e8;"
| 3. || {{w|Pete Conrad}} || 1930-06-02 || 1999-07-08 || 39y 5m 17d || 69y 1m 6d
|rowspan="2"| {{w|Apollo 12}} ||rowspan="2"| November 19–20, 1969 || {{w|United States Navy|Navy}} || {{w|Princeton University}}
|- style="background:#ffe8e8;"
| 4. || {{w|Alan Bean}}|| 1932-03-15 || 2018-05-26 || 37y 8m 4d || 86y 2m 11d || {{w|United States Navy|Navy}} || {{w|University of Texas, Austin}}
|- style="background:#def;"
| 5. || {{w|Alan Shepard}} || 1923-11-18 || 1998-07-21 || 47y 2m 18d || 74y 8m 3d
|rowspan="2"| {{w|Apollo 14}} ||rowspan="2"| February 5–6, 1971 || {{w|United States Navy|Navy}} || {{w|United States Naval Academy}}
|- style="background:#def;"
| 6. || {{w|Edgar Mitchell}}|| 1930-09-07 || 2016-02-04 || 40y 4m 19d || 85y 4m 28d || {{w|United States Navy|Navy}} || {{w|Carnegie Mellon University}}, {{w|Naval Postgraduate School}}, {{w|MIT}}
|- style="background:#ffe8e8;"
| 7. || {{w|David Scott}} || 1932-06-06 || || 39y 1m 25d ||
|rowspan="2"| {{w|Apollo 15}} ||rowspan="2"| July 31 - August 2, 1971 || {{w|United States Air Force|Air Force}} || {{w|University of Michigan}} (freshman year, and later, an honorary doctorate), {{w|United States Military Academy}}, {{w|MIT}}
|- style="background:#ffe8e8;"
| 8. || {{w|James Irwin}} || 1930-03-17 || 1991-08-08 || 41y 4m 14d || 61y 4m 22d || {{w|United States Air Force|Air Force}} || {{w|United States Naval Academy}}, {{w|University of Michigan}}
|- style="background:#def;"
| 9. || {{w|John Young (astronaut)|John W. Young}}|| 1930-09-24 || 2018-01-06 || 41y 6m 28d || 87y 3m 13d
|rowspan="2"| {{w|Apollo 16}} ||rowspan="2"| April 21–23, 1972 || {{w|United States Navy|Navy}} || {{w|Georgia Institute of Technology}}
|- style="background:#def;"
| 10. || {{w|Charles Duke}} || 1935-10-03 || || 36y 6m 18d || || {{w|United States Air Force|Air Force}} || {{w|United States Naval Academy}}, {{w|MIT}}
|- style="background:#ffe8e8;"
| 11. || {{w|Eugene Cernan}} || 1934-03-14 || 2017-01-16 || 38y 9m 7d || 82y 10m 2d
|rowspan="2"| {{w|Apollo 17}} ||rowspan="2"| December 11–14, 1972 || {{w|United States Navy|Navy}} || {{w|Purdue University}}, {{w|Naval Postgraduate School}}
|- style="background:#ffe8e8;"
| 12. || {{w|Harrison Schmitt}} || 1935-07-03 || || 37y 5m 8d || || {{w|NASA}} || {{w|Caltech}}, {{w|University of Oslo}} (exchange), {{w|Harvard University}}
|}

{{comic discussion}}
[[Category:Line graphs]]
[[Category:Math]]
[[Category:Statistics]]
[[Category:Science]]
[[Category:Space]]
[[Category:Comics to make one feel old]]

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Talk:195: Map of the Internet

893: 65 Years