Tag Archives: God

Commentary

What are galactic habitable zones and circumstellar habitable zones?

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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.

Commentary

What should a Roman Catholic think about naturalism and evolution?

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Charles Pope on the Archdiocese of Washington web site. (H/T Joe Carter on First Things)

Excerpt:

It is common to experience a rather simplistic notion among Catholics that the Theory of Evolution can be reconciled easily with the Biblical accounts and with our faith. Many will say something like this: “I have no problem with God setting things up so that we started as one-celled organisms and slowly evolved into being human beings. God could do this and perhaps the Genesis account is just simplifying evolution and telling us the same thing as what Evolution does.”

There are elements of the truth in this sort of a statement. Surely God could have set things up to evolve and directed the process so that human beings evolved and then, at some time he gave us souls. God could have done that.

The problem with the statement above is less theological than scientific because there is a word in that sentence that is “obnoxious” to evolutionary theory: “God.” The fact is that most Catholics who speak like this over-simplify evolutionary theory and hold a version of it that most Evolutionary Theorists do not hold. They accept the Theory of Evolution uncritically.

Yeah, because what evolutionists mean by “evolution” is that GOD HAD NO DETECTABLE EFFECT ON THE PROCESS. They mean that THE PROCESS OF EVOLUTION OCCURRED ENTIRELY WITHOUT DIVINE INTERVENTION. That’s what evolution means – fully materialistic, fully random, no intelligence needed, emergence of all the diversity of life we see.

Now what this means is that God is excluded as a cause by evolutionary theory. It would be fine if evolutionists (as natural scientists) were either silent on the question of God. Or, perhaps if they simply stated that things may be acted upon by an outside force or intelligence but that is beyond the scope of their discipline. But that is not what is being said by most proponents of evolutionary theory. They are saying that biodiversity results MERELY from natural selection and random (i.e. non intended or non-purposeful) genetic mutations. They are saying that observable effects of biodiversity are wholly caused by something natural, random and without any ultimate goal or plan.

But a Catholic cannot accept all of this. Even if a Catholic wants to accept that things have evolved in some way (whether through macro or microevolution) a Catholic cannot say that this process is simply random, chance, blind, or with no purpose. We believe that God alone created all things, and that he sustains all things. Neither do we confess some sort of “deist” God who merely started things off and then lets them take their own course. Rather, God sustains and carries out every detail.

Joe Carter adds:

In my experience, most people haven’t considered the issue of how the theological and scientific claims can be compatible. For instance, to be a “theistic evolutionist” in the sense that modern scient will accept, requires one to adhere to polygensism (the theory that Adam was not one historical man but, rather, a euphemism for “mankind”). That position, however, is not compatible with the teachings of the Bible, the Church, or of Jesus.

The dividing line between theists and non-theists is as follows: did God act in history in a way that his creative agency and intelligent agency is discernable to us using the objective methods of science? Atheists (and theistic evolutionists) say that God’s creative agency and intelligent (selection/sequencing) agency is neither necessary to explain what we observe in the universe, nor are the effects of agency detectable through science. Theists (and deists) say that God’s creative agency and intelligent agency is necessary in order to explain what we observe in the universe, and these effects of agency are detectable through science.

That is the dividing line. I don’t how I could be much clearer.

Polemics

Did the divinity of Jesus emerge slowly after many years of embellishments?

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How early is the doctrine of the divinity of Jesus?

When I answer this question, I only want to use the earliest, most reliable sources – so I can defend them on historical grounds using the standard rules of historiography.

The 4 sources that I would use are as follows:

  • The early creed in 1 Corinthians 15:3-8, and 1 Corinthians 1
  • A passage in Philippians 2
  • Two passages from Mark, the earliest gospel
  • A passage from Q, which is an early source of Matthew and Luke

So let’s see the passages.

1 Corinthians

I’ve written before about the early creed in 1 Corinthians 15:3-8, which skeptical scholars date to 1-3 years after the death of Jesus, for a variety of reasons I covered in the previous post. Here’s the creed which definitely makes Jesus out to be more than an ordinary man. Ordinary men don’t get resurrection bodies after they die.

Here’s the passage: (1 Cor 15:3-8)

3For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures,

4that he was buried, that he was raised on the third day according to the Scriptures,

5and that he appeared to Peter, and then to the Twelve.

6After that, he appeared to more than five hundred of the brothers at the same time, most of whom are still living, though some have fallen asleep.

7Then he appeared to James, then to all the apostles,

8and last of all he appeared to me also, as to one abnormally born.

Additionally, 1 Corinthians 1:21-25 talks about Jesus being “the power of God and the wisdom of God”. Paul is identifying Jesus with the divine.

21For since in the wisdom of God the world through its wisdom did not know him, God was pleased through the foolishness of what was preached to save those who believe.

22Jews demand miraculous signs and Greeks look for wisdom,

23but we preach Christ crucified: a stumbling block to Jews and foolishness to Gentiles,

24but to those whom God has called, both Jews and Greeks, Christ the power of God and the wisdom of God.

25For the foolishness of God is wiser than man’s wisdom, and the weakness of God is stronger than man’s strength.

But it gets even stronger! You all probably already know that the most important passages in the Old Testament for Jews is the famous “Shema“, which is found in Deuteronomy 6:4-9. The Shema is a strong statement of Jewish monotheism.

Here’s the passage:

4 Hear, O Israel: The LORD our God, the LORD is one.

5 Love the LORD your God with all your heart and with all your soul and with all your strength.

6 These commandments that I give you today are to be upon your hearts.

7 Impress them on your children. Talk about them when you sit at home and when you walk along the road, when you lie down and when you get up.

8 Tie them as symbols on your hands and bind them on your foreheads.

9 Write them on the doorframes of your houses and on your gates.

So how does Paul fit Jesus in with this strong statement of Jewish monotheism?

Paul alludes to the Shema in 1 Corinthians 8:4-6.

4So then, about eating food sacrificed to idols: We know that an idol is nothing at all in the world and that there is no God but one.

5For even if there are so-called gods, whether in heaven or on earth (as indeed there are many “gods” and many “lords”),

6yet for us there is but one God, the Father, from whom all things came and for whom we live; and there is but one Lord, Jesus Christ, through whom all things came and through whom we live.

Holy mackerel! How did that get in there? Paul is splitting the roles of God in the the Shema and identifying Jesus in one of the divine roles! Jesus is not an ordinary man. That passage “through whom all things came” foreshadows John identifying Jesus as “the Word of God”, which “became flesh and dwelt among us”. Holy snark – did you guys know that was all in here so early?

The date for 1 Corinthians is 55 AD. It should be noted that skeptical scholars like James Crossley accept these passages, and you can check it out in the debate audio yourself.

Philippians

Check out Philippians 2:5-11.

5Your attitude should be the same as that of Christ Jesus:

6Who, being in very nature God, did not consider equality with God something to be grasped,

7but made himself nothing, taking the very nature of a servant, being made in human likeness.

8And being found in appearance as a man, he humbled himself and became obedient to death— even death on a cross!

9Therefore God exalted him to the highest place and gave him the name that is above every name,

10that at the name of Jesus every knee should bow, in heaven and on earth and under the earth,

11and every tongue confess that Jesus Christ is Lord, to the glory of God the Father.

The date for Philippians is 60-61 AD. Still within the lifetime of the eyewitnesses, and written by an eyewitness who was in contact with the other eyewitnesses, like Peter and James, whom Paul spoke with numerous times on his journeys to Jerusalem.

Mark’s gospel

Mark’s gospel is the earliest and atheists like James Crossley date it to less than 40 AD, which is 10 years after the death of Jesus at most. When you read the gospel of Mark, you are getting the earliest and best information available about the historical Jesus, along with Paul’s epistles. So what does Mark say about Jesus? Is Jesus just a man, or is he something more?

Check out Mark 12:1-9:

1He then began to speak to them in parables: “A man planted a vineyard. He put a wall around it, dug a pit for the winepress and built a watchtower. Then he rented the vineyard to some farmers and went away on a journey.

2At harvest time he sent a servant to the tenants to collect from them some of the fruit of the vineyard.

3But they seized him, beat him and sent him away empty-handed.

4Then he sent another servant to them; they struck this man on the head and treated him shamefully.

5He sent still another, and that one they killed. He sent many others; some of them they beat, others they killed.

6“He had one left to send, a son, whom he loved. He sent him last of all, saying, ‘They will respect my son.’

7“But the tenants said to one another, ‘This is the heir. Come, let’s kill him, and the inheritance will be ours.’

8So they took him and killed him, and threw him out of the vineyard.

9“What then will the owner of the vineyard do? He will come and kill those tenants and give the vineyard to others.

And Mark 13:32, talking about the date of the final judgment.

32“No one knows about that day or hour, not even the angels in heaven, nor the Son, but only the Father.

And again, this passage is establishing a hierarchy such that Jesus is being exalted above all men and the angels, too. And the passage is embarrassing to the early church, because it makes Jesus look ignorant of something, so they would not have made this passage up. Jesus is not an ordinary man, he is above the angels – God’s unique Son.

The “Q” source for Matthew and Luke

Here’s Matthew 11:27, which is echoed in Luke 10:22:

27“All things have been committed to me by my Father. No one knows the Son except the Father, and no one knows the Father except the Son and those to whom the Son chooses to reveal him.

22“All things have been committed to me by my Father. No one knows who the Son is except the Father, and no one knows who the Father is except the Son and those to whom the Son chooses to reveal him.”

Since this passage is in both of Matthew and Luke, but not in Mark, scholars believe that it is in the earlier “Q” source used by both Matthew and Luke. Q predates both Matthew and Luke, and so it is also fairly early (maybe 67-68), although not as early as Mark and Paul. Bill Craig writes that this passage is also embarrassing because it says that no one knows Jesus.

Learn more

You can learn more about the early belief in the divinity of Jesus by listening to a lecture by William Lane Craig and reading the related paper, and by listening to the debate between Richard Bauckham and James Crossley on that topic. The first link contains other scholarly debates on Jesus.