Exoplanets
by Jeff
Image text: Planets are turning out to be so common that to show all the planets in our galaxy, this chart would have to be nested in itself--with each planet replaced by a copy of the chart--at least three levels deep.
Click the image to go to the large version. This one is an interesting one because I was expecting to go to the large version and see names and locations on every planet. But, no, this is a relatively simple comic that relies only on scale to get its point across. The point being that there are tons and tons of planets in our solar system galaxy and we need to learn about every one as soon as possible.
Orion Nebula
by Jeff
Image text: Also on the agenda: what's with his hips?
So, this one is a bit confusing because the title says "Orion Nebula", but in the comic they are talking about the constellation Orion. However, the sword/dong (dong is an American slang word for penis) itself contains the Orion Nebula, which is a diffuse nebula situated south of the three stars that compose Orion's Belt. It is seen as the middle "star" in the sword/dong of Orion. The star appears fuzzy to sharp-eyed observers, and the nebulosity is obvious through binoculars or a small telescope.
The image text is a quip about how small the hips are in Orion the constellation compared to the rest of its body.
Space Launch System
by Jeff
Image text: The SLS head engineer plans to invite Shania Twain to stand under the completed prototype, then tell her, 'I don't expect you to date me just because I'm a rocket scientist, but you've gotta admit--this is pretty fucking impressive.'
SLS, which stands for Space Launch System (naturally) is the new launch program being designed by NASA to replace the retired Space Shuttle launch system. In the first frame, Cueball is showing Black Hat something about the SLS, possibly a video on his phone or other portable electronic device.
As usually with his appearances, Black Hat is causing trouble. Here, Black Hat is by as much as I can find, telling the truth, because Nazi-Germany era scientists like Wernher von Braun, who was one of the developers of the Saturn V launch vehicle, came over to NASA and helped develop NASA's space program.
Black Hat's assumption in the last frame is obviously a bridge too far (which is where the joke is in the comic), but he gets his desired reaction out of Cueball, who is hanging his head.
Shania Twain comes into this comic in the image text because in her song "That Don't Impress Me Much", she sings: "Okay, so you're a rocket scientist/That don't impress me much". But, the image text argues that if she stood under the new SLS prototype, she would admit it was in fact, impressive.
Occulting Telescope
by Jeff
Image text: Type II Kardashev civilizations eventually completely enclose their planetary system in a Dyson sphere because space is way too big to look at all the time.
In this comic, Professor Cueball is suggesting an "Occulting Telescope", which follows directly with the definition of an occultation (thanks Wikipedia!) which is an event that occurs when one object is hidden by another object that passes between it and the observer. This telescope sees a star, then positions a disc between itself and the star, occulting itself and Earth from the light from the star.
The reasoning for this maneuver is that Professor Cueball thinks there are too many stars (as he says in the last frame).
In the image text, The Kardashev scale (thanks Wikipedia!) is a method of measuring an advanced civilization's level of technological advancement. The scale has three designated categories called Type I, II, and III. These are based on the amount of usable energy a civilization has at its disposal, and the degree of space colonization. In general terms, a Type I civilization has achieved mastery of the resources of its home planet, Type II of its solar system, and Type III of its galaxy. One of the properties of a Kardashev type II civilization is the creation of a Dyson sphere around a planet to contain all its energy. And lastly, a Dyson Sphere (Wiki'ed!) is a hypothetical megastructure originally described by Freeman Dyson. Such a "sphere" would be a system of orbiting solar power satellites meant to completely encompass a star and capture most or all of its energy output.
This comic's image text says that the secondary benefit from a Dyson sphere is that it obscures (or completes the occultation of) all those pesky stars.
Delta-P
by Jeff
Image text: If you fire a Portal gun through the door of the wardrobe, space and time knot together, which leads to a frustrated Aslan trying to impart Christian morality to the Space sphere.
This comic was posted late and now I'm late and I'm at work so I can't do as much explaining as I usually do, but I'll do my best. That's also why we have the best comment section on the Internet.
The basic idea of the formula and the comic are based on the books and movies of the Lion, the Witch and the Wardrobe in which a giant wardrobe contains a portal to a world known as Narnia. In the comic, someone connects an anchor to the wardrobe and throws it into the ocean which means that a steady stream of water at a velocity of 200 m/s will flow into Narnia.
The White Witch, the antagonist in the books and movies apparently won't know what hit her according to the caption.
The image text references the video game "Portal" in which you fire a portal gun into walls and etc to make "portals" that can open holes in other places so that you may portal through.
The image text also references the fact that CS Lewis wrote the Lion, Witch and Wardrobe books as a thinly veiled allegory of Christ's crucifixion with Aslan, the Lion in the title, playing Christ's part. (Spoiler alert! Sorry!)
This is a classic xkcd based on the intersection of literature, math and video games.
The Corliss Resolution
by Jeff
Image text: And no avian society ever develops space travel because it's impossible to focus on calculus when you could be outside flying.
Jeb Corliss is a professional BASE jumper and wingsuit flyer (similar to the wingsuit you can see in the 4th frame). Corliss has jumped from a lot of different buildings and monuments in the world. Hence, the Corliss Resolution.
In this comic, which is well explained by its own captions - life in general decides to find an activity that is more fun than survival, like flying off a cliff in a wingsuit, rather than working on space colonization. And as the image text adds on to that, flying is more fun that working on calculus.
65 Years
by Jeff
Image text: 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.
In this comic, over 65 years, Randall is projecting the number of living humans who have walked on another word (which I believe counts the moon). He is using actuarial tables or life tables which shows for each age the probability that a certain person will be alive by their next birthday.
This comic, obviously assumes that no one else is going to walk on another world going forward into the future. Which, as is mentioned in the image text, is a terrible idea for the future of the human race. If the human race only exists on one planet - one disaster can destroy the whole race. However, if humans extend their society to other planets, they lessen the risk of complete extinction.
Personally, I hope the graph above does not come true and the number of living humans who have walked on another world actually increases instead of decreases.
Nanobots
by Jeff
Image text: I think the IETF hit the right balance with the 128 bits thing. We can fit MAC addresses in a /64 subnet, and the nanobots will only be able to devour half the planet.
So, in this comic, the two characters are in orbit in space while evil nanobots are devouring the earth in a swarm. The nanobots stop after devouring 40% of the planet. This is a take on the "gray goo" scenario in which self-replicating nanobots destroy the earth while creating more and more of themselves non-stop.
However, the nanobots are only able to destroy 40% of the planet because (psedo math ahead!) 40% of the earth mass = (# of IPv6 addresses) x (A few cubic microns). Without more IP addresses, the nanobots cannot continue to replicate.
This is a joke on the current state of events in which the internet is currently running out of IPv4 addresses. The only difference is that we are on IPv4 and the nanobots are on IPv6.
1998 is when the first IP address registry was opened and IETF is the Internet Engineering Task Force.
Stingray Nebula
by Jeff
Image text: Eärendil will patrol the walls of night only until the sun reaches red giant stage, engulfing the Morning Star on his brow. Light and high beauty are passing things as well.
The Stingray Nebula is the youngest known planetary nebula in the galaxy. In 1987 it was an asymptotic giant branch (AGB) B1 supergiant and then became the Stingray Nebula in 1987. Well, didn't become that in 1987, the light of the incident reached the Earth in 1987.
This comic went from a reassuring comic about stars at night giving hope in the darkness, but then as with most xkcd's, it took a turn. In this case, the twist is that because Cueball's star he got attached to exploded into a nebula, we should only become attached to stars that aren't quite as volatile as the one that formed the Stingray Nebula.
UPDATE: Sorry for the late post, but I wrote this all out early this morning but didn't post it. I blame it on the fact that I brushed my teeth with a bottle of Jack... (not really).
Guest Week: David Troupes (Buttercup Festival)
by Jeff
Image text: Guest comic by David Troupes of Buttercup Festival, who is living in that lovely tree outside your window.
Wow, a Tuesday comic? I'm thrown off, that's why this is so late. Was not expecting that. But, I guess with "Guest Week" anything can happen.
This one from David Troupes of Buttercup Festival, which can be found here.
Pretty straight forward, Cueball and Cutie sitting on the moon and she says that she has never been so happy. But, then she stops herself. Once she pegs her old high school nemesis with a rock (moon rock?!), then she can truthfully say "I've never been so happy."