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

Dark Energy

Every object humans have ever studied, such as stars, planets (including the Earth), asteroids, gas clouds and living creatures such as ourselves, is composed of ordinary matter, which is made up of atoms. Interestingly, however, ordinary matter only composes 5% of the mass of the Universe. The remaining 95% is made up of dark matter and dark… Continue reading Dark Energy

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