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Krypton’s red sun

I was thinking about the possibility of planets existing around a red star…

Eldirao, TheSun of Krypton

Krypton’s sun, Eldriao, is a red star. This is a major plot point in the Superman comics. Kryptonians have evolved under the weak solar spectrum from their red sun and on their own world they’re no more super and a normal human is on Earth. However, under a yellow sun a Kryptonian gains vast superpowers. Knowing the star’s colour we can fairly accurately determine its other properties.

redsun

The single factor that dominates a star’s life is its mass. A star is essentially a giant ball of hydrogen with a self-sustaining nuclear (fusion) reaction at its centre. The amount of fuel for that reaction is determined by the mass of the star – double the mass of the star and you double the fuel available. The amount of light and power that the star radiates, its luminosity, is determined by the ferocity of that reaction and that ferocity is determined by the mass of the star to the power of 3.5 — if you double the mass you increase its energy output by a factor of 11! As you’ll notice, larger and larger stars burn fuel faster than the amount of available fuel increases. A massive star will be very powerful, but it will have a really short life span – maybe only a few million years. By contrast, a low mass star will be pretty dim, but it will keep shining for billions and billions of years.

Red Dwarf

If Eldriao is normal “main sequence” star – a star that hasn’t just formed and hasn’t run out of its normal fuel – the red colour will indicate that it is relatively low powered and low power output means low mass. These low-mass red dwarf stars last a very long time. One estimate of Eldriao’s age points at it being over 8 billion years old (the Fleischer Superman Encyclopaedia) which is consistent with it being of comparable or lower mass than our own Sun.

Planets can form around such a weak star, but the problem for life is something called the Goldilocks Effect. Life, as we know Jim, needs liquid water on the surface of a planet. Water will boil away on a planet that is too close to a star and it will freeze on a planet that is too far away. The distance of the planet from the star has to be just right (ergo the Goldilocks reference). For a red dwarf this habitable distance from the star is very small as a planet will have to huddle close to the star to stay warm.

Nevertheless, astronomers have found planets around these red dwarf stars. The most famous is Gliese 581, a star just 20 light years away from the Earth. It has a system of planets around it and it looks like one of these is within the habitable zone. Bizarrely, its so close to its sun that this planet only has a “year” that is 14 Earth days long. The case of Gliese 581 certainly means that a Krypton like world exist around a red dwarf star.

Red Giant

The alternative explanation for the red colour would be that Krypton’s star is dying. After the hydrogen runs out of at the centre of a star it starts burning other elements including helium and carbon. The change in the way the fuel is burnt causes  the star’s structure to change. The core contracts and the other layers puff up creating a giant outer envelope. Krypton’s sun could be one of these red giants, but the transition from normal star to red giant causes havoc on a solar system.

As the star swells up to giant size it engulfs the planets closest to it. Its changing luminosity also means that the habitable zone – the part of its solar system that can support life – will also shift. There is certainly a variation of the Superman story that could be told about how life evolved late on Krypton as it shifted into its solar system habitable zone or how the Kryptonians migrated there from another planet to escape the star’s expansion. This latter option could explain an old Kryptonian myth about their world being settled by interstellar travellers 10,000 years ago. The shifting solar system could also explain why the planet Xenon was thrown out of the Kryptonian solar system. The same shifting gravitation patterns could even be invoked to explain Krypton’s own destruction.

Which is it.

Personally I’d have thought that Krypton’s sun was a red dwarf. The idea of a red giant is certainly interesting, but a habitable world surviving the transition to a giant sun seems too improbable.

Phrase of the Day: Alien Space Bats

It started off with Warren Ellis citing a Jonbar Hinge in Do Anything 012 (his Bleeding Cool column). I was interested in where the phrase had come from so there was only one recourse: Wikipedia – the fountain and end point of all pointless knowledge. Well the Jonbar Hinge (a small seemingly random event that causes a branch or divergence in history) page led to the Alien Space Bats page. These are plot device aliens that are also used to explain or to create a branch and divergence in history and like the Suicide Squid they originate on usenet (maybe somebody needs to do a Usenet Bestiary). The difference between the Jonbar Hinge and the Alien Space Bats is that the latter creates a branch point that no longer relies on any sense of logic or science (e.g., what if magic suddenly reappeared).

Mister Mind revealed

Now think back to the events of DC’s 52 comic where Mister Mind, in Hyperfly mode, is rampaging through the Multiverse. This flight/feeding creates divergent histories in each of the 52 parallel universes.Well, those wings look more Bat-like than Moth-like to me. Could Mister Mind be a literal Alien Space Bat, a tip of the hat prehaps?

Alien Space Bats

A measure of a civilisation

On this 40th anniversary of the lunar landings, I was thinking about how we compare civilisations. A bit dull I know, but it passes the time. I think a fairly good measure is their physical size versus their sphere of exploration. The distinction is important. The ancient Roman Empire was the same approximate physical size as the United States, but the sphere of exploration of the Roman Empire didn’t extend much beyond their borders. By contrast the sphere of exploration of the USA can be taken as far as the lunar orbit.

Physical size would be a measure of that civilisation’s political or military might – its either been strong enough to expand of enlightened enough to form a political block – where as sphere of exploration is a measure of the civilisation’s technological and scientific ability. One could even split the sphere of exploration into that physically explored (humans have gone to the Moon) and that which they have direct, reasonably accurate information about (we’ve sent unmanned probes to the edge of the solar system).

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The Guardians of the Universe are Idiots

I had a train of thought that started off with “Isn’t the Universe massive!” and ended with “the Guardians of the Universe are idiots”.

There are approximately 100 billion galaxies in the Observable Universe and there are as many stars in each galaxy as there are galaxies in the Universe. So there are about 10 quadrillion stars (10,000,000,000,000,000,000,000) in the observable universe. If short, blue, and mysterious think that 7200 lawmen are going to be able to effective with over 1.4 trillion star systems to patrol each they’ve got another thing coming.

A single Green Lantern wouldn’t just be covering the nearest planets to Earth, they wouldn’t just be covering the entire galaxy, but they’d probably be covering the entire local group of galaxies and a good fraction of the surrounding local supercluster of galaxies. Talk about police resources being over stretched.

Like many civilisations, the self appointed “Guardians” don’t hire enough police to get the job done properly. What’s more, as we’ve seen recently, they’re heaping more and more rules into the Book of Oa without a thought to the well being of their staff. They’ve got a rapidly deteriorating security problems with anarchists (Red Lanterns), terrorists (Sinestro Corps), and communists (Blue Lanterns) mixing it up. And the body count is rising – or more specifically the bodies are rising (Black Lanterns).

How much more can our poor over-stretched, under paid Lanterns take before they’re forced to unionise?

Cartoon Ice

icecubeI was just re-watching the Superman: The Animated Series episode Speed Demons, the first appearance of the animated Flash, ahead of posting a review of it. What caught my attention was a scene where the heroes become encased in a block of ice when the Weather Wizard lowers the temperature around them. I’d also been playing the Mister Freeze level on the Batman Lego game (another review I’m planning). Both use the standard comicbook/cartoon trick – an instantly forming block of ice holds the heroes immobile, it is visually spectacular, and generally only gives the heroes a bad case of chills.

The situation is so badly unscientific its almost impossible to consider seriously, but the question that did occur to me was how much ice can you make from just the water vapour in the air. If you did have a cryogenic gun that froze the air around the Flash, how much ice could you actually create?

The actual answer is surprisingly simple. A ball park figure is that air at a temperature of 15-20K can hold about 15 grams of ice per cubic meter of air. Ice floats because it is only about 90% of the density of normal water. This means that your average ice cube (sides of about 2cm) has a mass of 7 grams. So that cubic meter of 15-20K air contains as much water a two ice cubes. Not even enough for a good cocktail.

Those ice makers you see at the 7-11 and elsewhere are actually connected to a water tap, they just wouldn’t be able to make enough ice otherwise. And neither can our supervillains. To trap the Flash in a 2 cubic meter block of ice – just enough to hold a man – he would need to condense the water vapour out of almost 300 cubic meters of air. That’s larger than the volume of the Hindenberg Zeppelin!

On the practicalities of tricks arrows

Green Arrow is one of those heroes who often comes off badly if his trick arrows aren’t taken seriously. They’re one of the real holdovers from the Silver Age – a miriad of gadgets and widgets that rivals anything Batman has in his Utility Belt. There were explosive arrows, boomerang arrows, gas arrows, fire fighting arrows, and the all time classic: the boxing glove arrow. Like so much of the whimsy of the Silver Age the trick arrows were boxed up and thrown into limbo by the new seriousness of the late 1980s. Yet, there is something about these things that just can’t be kept down. They’re just too fantastically goofy to die.

For me the first story that heralded the return of the Trick Arrows was Grant Morrison’s two-part JLA story featuring the second Green Arrow (Conner Hawke, Oliver Queen’s adult son) stranded alone on the JLA Watchtower taking on the Key with only his dad’s old weapons. A few years after that Kevin Smith’s relaunch of the Green Arrow title hearlded the return of everything cool about the Green Arrow and the addition of a real sense of fun to his franchise – I’m not one of those who ever took to Green Arrow as an urban-hunter, but those stories suited their time. And if there is one thing Green Arrow has always done it’s change to reflect his times.

Trick Arrows are a very visual motif and have worked surprisingly well on the small screen. The teaser for Initiation, the first episode of Justice League Unlimited, has the classic Neal Adams version of Green Arrow fighting a gang of masked gun-men. In under thirty seconds we see a tear-gas arrow, a net arrow, and the boxing-glove arrow deployed. Each of them is not only nicely animated, but works perfectly with the show’s physics. The trick arrows even work on Smallville. In her magazine column freelance writer Jayne Nelson (SFX #153, pg 120) comments on her initial skepticism about Green Arrow’s character :

Until, in episode four, he pulled out his bow and saved Lois’s life by shooting a bullet our of the air as it flew towards her.

Admittedly, Clark could’ve caught it just as easily, but he’d have use his hands in time-honoured Son of Krypton fashion. Green Arrow used a honking big bow with all sorts of bells and whistles and pointy bits far more sophisticated than a bit of palm action. His arrows give out clouds of gas or electro-magnetic pulses or just stun people. They are super, duper, frosty cool with knobs on. And now, thanks to these strings in his bow, I love the Green Arrow. A lot.

As any Dungeons and Dragons or rpg fan will know speciality arrows aren’t just the preserve of the comicbook archer. Many a gamehead has combed the pages of history trying to find that extra +1 to hit. Gamers have collected almost every varient on the standard pointed type going. They’d arm themselves with narrow-tipped piecering bodkin arrows, traditional broad-bladed cutting arrows, forked arrows for cutting ropes & rigging, and even the assassin’s poisoned arrows. But that doesn’t even begin to scratch the surface of the range of exotic arrows that have been used through out history and are even still in use today. These include

  • Medievil Europeans used a quenched steel arrow heads for piercing plate armour.
  • The Kabura-ya signal arrow, a ritualised Japanese whistling arrow.
  • Modern british archers can buy rubber tipped arrows for when they want to do less damage to small targets.
  • American hunters can buy arrows with retractable blades!
  • The first rockets in China were fireworks attached to arrows.

That doesn’t even cover the arrows that have been recently registered with the patent office. These include the “light grenade” arrow, an explosive hunting arrow, a rotating arrow that sounds suspiciously like Ollie’s old drill arrow, a tracker arrow and a drug injecting arrow. It isn’t even as if there is just one patent for each, but there is often multiple patents for each and I assume only a specialist would know the difference. Unfortunately most of the patents are involved with increasing the lethality of hunting arrows whereas Ollie’s trick arrows were really the solution to how a non-lethal superhero could use an otherwise lethal weapon.

As for Hawkeye’s grenade arrows, even they have their forerunner. The Romans had a type of incendiary arrow and as mentioned the Chinese used firework’s to extend the range of their arrows (the first rocket propelled projectiles). Even as late as the Vietnam war an American commando (Donnald Shepard) found that flaming arrows were perfect for flushing people out of flammable grass huts.

Some of the explanations of Green Arrow’s equipment may fall flat, but against many real historical arrows the trick one don’t really look that silly any more. Sure, there are still issues about balance and accuracy with some of the bulkier arrowsheads, but more and more of Ollie’s toys look feasible as ideas even if the Silver Age illustrations weren’t entirely practical.

Heavy Persian Batman

According to Wikipedia a Batman was a ancient Persian measure of mass equal to about 2.97 kg or 6.5 pounds. That’d mean that Batman weights 32 batmans. The name was also used in parts of Russia for a unit equal to 16.4 metric tonnes. So you get 5500 Persian batmans or 172 Batmen to one Russan batman.

Is Pluto a planet?

How many planets are there in our Solar System? Nine, you think. Yet, the body that regulates the naming and classification of astronomical objects, the IAU, is currently debating whether there should be more or less than nine. All this stems from the status of Pluto and how we differentiate a planet from the other space rock floating around the solar system.

The field of astronomy that I work in is called Star Formation and that’s closely related to the field of Planet Formation. The broad paradigm we’re currently working under is that the sun formed when a rotating cloud of gas collapsed along its axis of rotation to form a disc. The small proto-sun was at the centre of that disc and gas spiraling inwards from the disc was used feed its growth. After the Sun has finished forming the scattered rocky remnants of the disc started to bumb and stick together forming proto-planets. Some of those rocks become big enough to capture atmospheres from the remaining gas in the disc. This is a very violent era with proto-planets crashing into each other or being thrown out of the disc.

However, eventually things begin to settle down to a more recognisable state. Most of the mass is consolidated into eight major planets all orbiting in the what use to be the plane of the disc. There is still a fair amount of “builders rubble” left, but this is mainly left at the edge of the solar system in a massive extended shell of material called the Opik-Oort Cloud (which is where comets come from) and in a belt of larger objects called the Edgeworth-Kuiper Belt. The largest object in the Edgeworth-Kuiper Belt and the only one we were able to detect until recently is the object we call Pluto.

Pluto was discoverd in 1930 by American astronomer Clyde Tombaugh and was added to the text books as the ninth planet. As we’ve come to understand Pluto’s place in the solar system there have been calls for it to be down graded from planet status and reclassified as just a Edgeworth-Kuiper Belt object. That has been constantly rejected by more historically minded astronomers. But it does create the problem that if Pluto is a planet then there are seveal other objects in the solar system which really should be considered as candidates for planet status.

Personally I think this is all a waste of time and man power. The latin root of the word Planet means “to wander” and that is pretty much the classical definition of a planet. They are objects in the night sky that appear to move, to wander, relative to the fixed pattern of background stars. Astronomy, like taxonomy, has always been a science fixated with the classification of things and we’ve constantly been searching for a more technical definition of a planet. However, we fail at every step and even if the IAU adopts the new scheme there will be legions of astronomers who will disagree or ignore it. And that’s side from the fact that American astronomers would never allow the only planet to be discovered by an American to be taken away from them

The solution isn’t to reclassify Pluto as that just confuses the public and vexes small children. Better to leave it where it is and use it as an excuse to teach people about the Kuiper Belt and the smaller members of our solar family.

The Voyagerisation of Science

Real scientific papers: “Black Holes with Flavors of Quantum Hair?”.

One can imagine Star Trek’s Captain Janeway saying “Tuvok, we’ve got a black hole to shave!”