Our finely-tuned Universe part III – Explanations for fine tuning

As discussed in my previous two posts our  Universe appears to be very finely tuned and is governed by four fundamental interactions. A relatively small  increase or decrease in the strength of one of these interactions, such as making the force of gravity weaker or stronger, would make the emergence of life impossible. The four… Continue reading Our finely-tuned Universe part III – Explanations for fine tuning

Our finely-tuned Universe part II – Examples of fine tuning

In a previous post I talked about the four forces which govern the way the Universe works. I’m now going to give some examples of fine tuning. How different our Universe would be if these four forces had very different relative strengths. But before I do this, it is worth giving a quick summary from… Continue reading Our finely-tuned Universe part II – Examples of fine tuning

Our Finely-tuned Universe Part I-Fundamental forces

This is first of a series of three posts in which I'll talk about the idea that the fundamental forces which govern our Universe and fundamental constants such as: the strength of gravity, the electric charge of the electron and the amounts of matter, dark matter and dark energy  in the Universe have been in… Continue reading Our Finely-tuned Universe Part I-Fundamental forces

Measuring Distances in Cosmology

I have recently written an article for my local amateur astronomical society about distance measurements in cosmology. There is a lot of confusion about what we mean by "distance" on the vast such scales and the article was written to help clear up of these misunderstandings. It is an expanded version of a shorter blog… Continue reading Measuring Distances in Cosmology

Cosmic Horizons

Update 5 September 2022. A video covering much of the material in this post is available at: https://youtu.be/hw07Yh7b63M ------------------------------------------------------------------------------------------------------ Original post below Although the Universe may be infinite in extent, in the generally accepted Big Bang cosmology we can only see a small fraction of it. This is known as the observable universe. Field of… Continue reading Cosmic Horizons