Copernicus

In this post I'll talk about Nicolas Copernicus (1473 - 1543) and the heliocentric theory.  The move away from the prevailing Earth-centred theory of the Universe to the heliocentric theory represents one of the greatest advances in astronomy ever made. Nicolas Copernicus - Image from Wikimedia Commons Background - the need for a better theory… Continue reading Copernicus

Short post of the month February 2016 – gravitational waves

The subject of February's short post of the month is gravitational waves. These were predicted by Albert Einstein back in 1916, and after decades of searching have finally been detected. In an announcement made on 11 February at a Washington DC press conference David Reitze, the executive director of the LIGO Laboratory, said: “Ladies and gentlemen, we have… Continue reading Short post of the month February 2016 – gravitational waves

The Steady State Theory

This post, the latest in my series about cosmology, the study of the origin and evolution of the Universe as a whole, talks about the Steady State theory. This is an elegant alternative theory to the Big Bang, which was very popular among astronomers in the 1950s, although it has now been discarded. What is the Steady… Continue reading The Steady State Theory

Ultimate Fate of the Universe

This post, which is the latest in my series on cosmology, is about the ultimate fate of the Universe, a subject which has engaged scientists, philosophers and religious leaders for centuries. There are many possible endings to the Universe, but the outline I will present here, which is sometimes called "The Big Freeze", is the most commonly held… Continue reading Ultimate Fate of the Universe

A Brief History of the Universe

This post covers a brief history of the Universe from the Big Bang until the the present day. This, as I am sure you'll agree, is a pretty big topic so I can only give a outline of some of the key events and when we believed they happened. This post is the second in my… Continue reading A Brief History of the Universe

The Universe Past, Present and Future

The  Universe is all existing matter and space, including all stars, planets, galaxies and the space between them. This post, which is the first in a series, discusses the origins of the Universe and its ultimate future. How large is the Universe ? Our Solar System belongs to a galaxy which we call the Milky Way (shown below).  The… Continue reading The Universe Past, Present and Future