As we have explained before, scientists understand that a vast percentage of the matter in the creation is something they call dark matter. The simplest way to understand dark matter is to realize that when something is spinning around a core, there must be a force to keep the spinning mass from flying away because of centrifugal force. The dark matter mystery is the unknown quantity preventing spiral galaxies like the Milky Way from flying apart.
If you spin a child around so fast that their feet come off the ground, you must hold their hands tightly. If you let go, they would fly off away from you. Stars going around the center of a galaxy also have to be held by some force. The stars move so quickly that no known force could keep them where they are. That means there is a gravitational force we can’t see holding the stars in their position. We refer to the mass that exerts that gravitational force as dark matter.
Astrophysicist Peter van Dokkum of Yale University has announced the discovery of a galaxy known as DF2, which has stars and star clusters moving at a very slow pace around the core of the galaxy. In all other galaxies having stars at the same distance as stars in DF2, the stars are moving three times as fast as the stars in DF2. That can only mean that there is less dark matter in DF2.
This discovery increases the dark matter mystery because it appears that dark matter is not constant in the cosmos. The amount of dark matter in a galaxy depends on what is needed to keep everything moving at a speed that produces stability in the galactic system. There is a great deal of debate about this discovery, but it appears that the design of galaxies has a new variable that is critical to their existence. That critical factor is how much dark matter has been supplied to keep the system stable. God has tools affecting the creation that we are just beginning to understand. The role of dark matter is only one of those.
I have a bicycle wheel that I use to demonstrate circular motion and forces to my physics students. Some of the forces that we can demonstrate seem to contradict common sense, but they are physical forces that make life possible.
The wheel has a handle on both sides. If you spin it rapidly and put one handle in the crotch of your hand between your thumb and first finger, you can completely let go of the other handle, and the wheel will stay in place, seemingly defying gravity. As the wheel slows down, it begins to wobble, and the slower it goes, the more rapid its turning motion is. This is called precession, and it applies to all spinning objects.
Several years ago when I was teaching this unit in my physics class, I did this demonstration. My class skeptic, who tried to make sure I knew he wasn’t impressed with anything I did, said: “OK – big deal, how does that mean anything to me?” My reply was that he wouldn’t exist if the universe had not been designed with these laws in place creating the physical forces that make life possible.
We live on a globe spinning at roughly 1000 miles per hour. The globe itself is revolving around the Sun at 67,000 miles per hour in a solar system that is orbiting the core of our Milky Way galaxy at 515,000 miles per hour. Each of those motions involves forces that make life possible. We would not have weather moving heat and moisture around the globe without the rapid spinning. The Earth would collapse into the Sun if we weren’t traveling at such an enormous speed. The solar system would collapse into the core of the galaxy and be absorbed by the black hole that holds our system together if we weren’t moving fast enough to avoid such a thing happening.
We understand these fundamental laws of physics, but our observations tell us that the picture we have painted here is oversimplified. Stars on the outer edges of the galaxy are circling at roughly the same speed as stars near the core, and that should not be happening. We know that there must be dark matter filling in for the lapses in speed that we measure. Either that or the darkness is simply in our understanding.
The reality of the motions and physical forces that make life possible on Earth are there for us to examine. However, the implications of what we see defy our imagination and speak of the reality of the God who designed and created it all.
A skeptic remarked to me, “If a wise God created the universe, it would have been designed better. Our Milky Way galaxy and the Andromeda galaxy are on a galactic collision course. They are going to smash into each other and tear each other apart. That’s the end of life on Earth. You’re God must not be very smart.” What could I say? Yes, it’s true that astronomers have determined that there will be a galactic collision of the Milky Way and Andromeda galaxies resulting in the destruction of both. But there is more to the story.
Recently I read an article about scientists who are studying two black holes that appear to be orbiting each other 750 million light-years from Earth. The scientists are watching them to see what will happen when two black holes collide as they spin into each other. The reason for the scientists’ curiosity is they want to know what will happen when the black holes in the center of the Milky Way and Andromeda come together. (It seems that most galaxies have black holes in their center.) Of course, the center of the galaxies will not meet until long after the outer spirals have destroyed each other, and Earth as well. Still, the scientists want to know what will happen when black holes collide. Will they swallow each other and become a super-super-massive black hole? Will they disappear? Who knows?
The scientists have been watching those distant orbiting black holes for about 12 years now. How much longer will they have to wait to find the answer? They estimate that those black holes orbit each other every 24,000 years. How many orbits will it take for them to converge in a catastrophic explosion of energy? At this point, it’s anyone’s guess. The bottom line is that it’s going to take a lot longer than 12 years, or even 12 hundred, or 12 thousand, or maybe even 12 million. The scientists working on the project will not be around to learn the answer.