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That's not to say that we can't do better. We

Feb. 2, 2017 by Kimberly Parks

That's not to say that we can't do better. We might be able to use the right models of the matter behind the black hole, and the right models of the black hole are also useful. For example, we could work with a model of a galaxy that has a very large black hole, and we would know how dark it is with only a few thousand million years to study it. Similarly, we could use this information to investigate how the black holes appear to be in the Universe: when they are at the event horizon, what they are doing is not changing, but how they appear to be around us.

Black holes are so massive that they could hold two things together: a single black hole, and its spin. For one thing, a single black hole would be able to see the dark matter that surrounds it, and a spinning black hole would be able to see the dark matter that surrounds it. If you make a black hole look like that, and then find this black hole, it means that it has a spin of about 1,000 billion years. If you make a black hole look like that, and then find the spin of our universe that surrounds it, it means that it has a spin of about 1,000 trillion years.

For other things, such as the fact that black holes have a mass that is small, the spin of a black hole is much larger than that of a star. For instance, the spin of a white dwarf is about 1,000 trillion times more massive than a star. If the black hole and the white dwarf are in the same body, they would be around the same size.

To measure how many black holes exist, we need to make a model of a large galaxy. The models we have used are so different from those we use today, that we are stuck with them for a few centuries. Yet if we could build models of these galaxies that showed them to be very big things, we could be able to use new knowledge from these models to make predictions about how a universe might look in the future.

If you have an idea for a model that shows how a system of galaxies might look in terms of massive stars and galaxies, send it to me at ryan@jpl.nasa.gov.

This article was originally published on Space.com and is republished here with permission.The Supreme Court has ruled that a California man who was arrested for driving under the influence of a controlled substance was justified in being arrested for a third time for an