Polemics

What makes a planet suitable for supporting complex life?

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The Circumstellar Habitable Zone (CHZ)

What do you need in order to have a planet that supports complex life? First, you need liquid water at the surface of the planet. But there is only a narrow range of temperatures that can support liquid water. It turns out that the size of the star that your planet orbits around has a lot to do with whether you get liquid water or not. A heavy, metal-rich star allows you to have a habitable planet far enough from the star so  the planet can support liquid water on the planet’s surface while still being able to spin on its axis. The zone where a planet can have liquid water at the surface is called the circumstellar habitable zone (CHZ). A metal-rich star like our Sun is very massive, which moves the habitable zone out further away from the star. If our star were smaller, we would have to orbit much closer to the star in order to have liquid water at the surface. Unfortunately, if you go too close to the star, then your planet becomes tidally locked, like the moon is tidally locked to Earth. Tidally locked planets are inhospitable to life.

Circumstellar Habitable Zone
Circumstellar Habitable Zone

Here, watch a clip from The Privileged Planet: (Clip 4 of 12, full playlist here)

But there’s more.

The Galactic Habitable Zone (GHZ)

So, where do you get the heavy elements you need for your heavy metal-rich star?

You have to get the heavy elements for your star from supernova explosions – explosions that occur when certain types of stars die. That’s where heavy elements come from. But you can’t be TOO CLOSE to the dying stars, because you will get hit by nasty radiation and explosions. So to get the heavy elements from the dying stars, your solar system needs to be in the galactic habitable zone (GHZ) – the zone where you can pickup the heavy elements you need but not get hit by radiation and explosions. The GHZ lies between the spiral arms of a spiral galaxy. Not only do you have to be in between the arms of the spiral galaxy, but you also cannot be too close to the center of the galaxy. The center of the galaxy is too dense and you will get hit with massive radiation that will break down your life chemistry. But you also can’t be too far from the center, because you won’t get enough heavy elements because there are fewer dying stars the further out you go. You need to be in between the spiral arms, a medium distance from the center of the galaxy.

Like this:

Galactic Habitable Zone
Galactic Habitable Zone and Solar Habitable Zone

Here, watch a clip from The Privileged Planet: (Clip 10 of 12, full playlist here)

The GHZ is based on a discovery made by astronomer Guillermo Gonzalez, which made the front cover of Scientific American in 2001. That’s right, the cover of Scientific American. I actually stole the image above of the GHZ and CHZ (aka solar habitable zone) from his Scientific American article (linked above).

These are just a few of the things you need in order to get a planet that supports life.

Here are a few of the more well-known ones:

  • a solar system with a single massive Sun than can serve as a long-lived, stable source of energy
  • a terrestrial planet (non-gaseous)
  • the planet must be the right distance from the sun in order to preserve liquid water at the surface – if it’s too close, the water is burnt off in a runaway greenhouse effect, if it’s too far, the water is permanently frozen in a runaway glaciation
  • the solar system must be placed at the right place in the galaxy – not too near dangerous radiation, but close enough to other stars to be able to absorb heavy elements after neighboring stars die
  • a moon of sufficient mass to stabilize the tilt of the planet’s rotation
  • plate tectonics
  • an oxygen-rich atmosphere
  • a sweeper planet to deflect comets, etc.
  • planetary neighbors must have non-eccentric orbits

By the way, you can watch a lecture with Guillermo Gonzalez explaining his ideas further. This lecture was delivered at UC Davis in 2007. That link has a link to the playlist of the lecture, a bio of the speaker, and a summary of all the topics he discussed in the lecture. An excellent place to learn the requirements for a suitable habitat for life.

News

Woman who escaped from North Korea tells her story

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This is from the UK Telegraph.

Excerpt:

Yeonmi was born on October 4 1993 in Hyesan, a notoriously cold river port along North Korea’s 850-mile northern border with China. The following year, on July 8, Kim Il-sung, the country’s 82-year-old founder and ‘Great Leader’, died of a heart attack. Hopes that he might have been ready to gradually open North Korea to the world evaporated as his son Kim Jong-il took power and set about transforming the hermit nation into a member of George W Bush’s notorious ‘axis of evil’.

Meanwhile, the economy was collapsing and the Great Famine, which would eventually claim up to 2.5 million lives, according to Andrew Natsios, the former head of USAID, was beginning to take hold. As Barbara Demick describes in Nothing to Envy, her definitive book on the period, those too young, too poor or too honest to find food quickly died. ‘The killer targets the most innocent, the people who would never steal food, lie, cheat, break the law or betray a friend.’

[…]Initially shielded from the effects of the famine, Yeonmi’s world started to disintegrate when, in 2002, her father was arrested for illegal trading. ‘Everything changed,’ she recalls. Yeonmi’s father was taken to a prison near Pyongyang and given a 17-year sentence. Her mother visited him once but that was enough to see the toll that the brutal torture had taken on her husband. He was beaten. Guards placed sticks between his fingers and crunched them together. He was made to sit in excruciating stress positions for interminable periods. Prisoners were deprived of water and food. ‘The environment was crazy. So many bugs and lice,’ Yeonmi says. ‘They treated them like animals. He was a really brilliant man. He was my hero, and the country just beat him. I couldn’t believe it.’

Yeonmi’s father was luckier than many North Koreans who were spirited off to the country’s Soviet-style gulags, never to return. According to a Human Rights Watch report in January this year, up to 120,000 political prisoners, among them children, are currently being held in secretive labour camps known in Korean as the kwan-li-so. Torture including ‘sleep deprivation, beatings with iron rods or sticks, kicking and slapping, and enforced sitting or standing for hours’, is routine, the group found.

After three years Yeonmi’s father managed to bribe his way out of jail. But by then he had been diagnosed with colon cancer. When Yeonmi saw him on his release, the once strapping figure had been transformed into a ghost of a man. ‘He had changed so much. He was so small. He spoke differently. I couldn’t believe it was my father,’ she says.

[…][O]n the night of March 30 2007, Yeonmi and her mother made their way towards the border with the help of a people smuggler. Yeonmi’s father stayed behind, to minimise the risks. They crossed three mountains and finally came to a frozen river that separated the two countries. It was desperately cold, Yeonmi says, and she remembers feeling terrified that the ice beneath them would give. But they eventually made it to the other side. On dry land, they ran. ‘I ran so fast. The only thing I could think was that I could get shot. I ran and ran and ran.’

The rest of the article tells the terrifying story of how Yeonmi and her family escaped to South Korea.

I read this article and it really caused me to think a lot about what happens when we are not careful about who we vote for. North Korea is an officially atheist and communist regime. There is no public expression of Christian convictions there, nor is there any free market capitalism. That probably sounds like a great idea to many of the people in this country who have the same anti-Christian, anti-capitalist views. But it doesn’t sound like a good idea to me.

News

Scientist who was right about cooling in 2000 predicts more cooling

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From CNS News.

Excerpt:

Dr. Don Easterbrook – a climate scientist and glacier expert from Washington State who correctly predicted back in 2000 that the Earth was entering a cooling phase – says to expect colder temperatures for at least the next two decades.

Easterbrook’s predictions were “right on the money” seven years before Al Gore and the United Nation’s Intergovernmental Panel on Climate Change (IPCC) shared the 2007 Nobel Peace Prize for warning that the Earth was facing catastrophic warming caused by rising levels of carbon dioxide, which Gore called a “planetary emergency.”

“When we check their projections against what actually happened in that time interval, they’re not even close. They’re off by a full degree in one decade, which is huge. That’s more than the entire amount of warming we’ve had in the past century. So their models have failed just miserably, nowhere near close. And maybe it’s luck, who knows, but mine have been right on the button,” Easterbrook told CNSNews.com.

“For the next 20 years, I predict global cooling of about 3/10ths of a degree Fahrenheit, as opposed to the one-degree warming predicted by the IPCC,” said Easterbrook, professor emeritus of geology at Western Washington University and  author of 150 scientific journal articles and 10 books, including “Evidence Based Climate Science,” which was published in 2011.

So what’s the mechanism that he used for his predictions?

This:

Easterbrook said he made his earlier prediction by tracing back “a consistently recurring pattern” of alternating warm and cool ocean cycles called the Pacific Decadal Oscillation (PDO) that occurs naturally every 25 to 30 years. He discovered that the PDO corresponded with a similar temperature cycle demonstrated by isotope ratios found in Greenland ice cores going all the way back to 1480.

“We don’t know what the driving mechanism is, but it’s very consistent. It’s happened five times a century and every time it’s happened, there’s been a corresponding change in global temperature, either warm or cool,” Easterbrook told CNSNews.com.

“What I did was I projected this same pattern forward to see what it would look like. And so in 1999, which was the year after the second warmest year on record, the PDO said we’re due for a climate change, and so I said okay. It looks as though we’re going to be entering a period of about three decades or so of global cooling.

“And so in 2000, I published a paper with the Geological Society of America in which I predicted that we were going to stop warming and begin cooling for about 25 or 30 years, on the basis of taking the temperature records that go back a century or more and simply repeating the pattern of warming and cooling, warming and cooling, and so on.

“And that in fact has happened. We have now had 17 years with no global warming and my original prediction was right so far. But we have still probably another 20 years or so to see if the cooling trend continues, and if it does, then my prediction will be right and my methods will be right. And so what it boils down to is, so far so good.”

We’ve had seventeen years of global cooling, and now a prediction for more global cooling – 20 more years of it. Where do we taxpayers go to get our money back for the almost $70 billion we spend propping up renewable energy programs.