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About The Universe 3: Scale of the Universe and our Closest Neighbours

February 6, 2008 4 comments

DISCLAIMER: I am not an expert in astronomy or physics. If you spot factual or numerical errors below, please report them in the comments section. If you have corrections to empirical distances or object data, please cite upto date authoritative references (ie. not Wikipedia), as I believe I have used the most recent accurate data available. Some figures have been deliberately rounded for simplicity and may contain rounding errors.

This document is in its 3rd draft and is not yet complete.

Welcome to chapter 3! In this chapter I’m going to talk about the scale of the Universe – that is, how big and old it is.

I’ve put off writing this chapter for almost a year. Part of the problem is that there is so much diversity around us that it’s impossible to summarise in a few pages. Another problem is how to describe and visualise the huge distances and times we’re going to look at – and that’s where we shall begin. Read more…

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About The Universe 2: Our Neighbourhood: The Earth and The Nature of Planets

October 18, 2006 Leave a comment

When I was a kid, I had a Time Life book called The Universe. It was published in 1967, two years before man first set foot on the moon. The Universe went into great detail about the neighbouring planets in our Solar System, but hardly talked at all about what lay outside. Without the internet or the money to buy books to find out more, I wondered about what is out there beyond the Solar System for many years. If you’ve been wondering too, then I’m going to tell you soon enough!

But first, let’s start at home with our own planet: Earth. In this chapter, I’m not going to try and explain the ‘how’ or ‘why’ of Earth, just the ‘what’; I’ll explain the overall behaviour of the Earth without explaining why it came to be this way. We’ll go into that later. Read more…

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