Welcome to Explaining Science


I am Steve Hurley and welcome to Explaining Science

I started this popular science blog back in April 2014, originally under the name The Science Geek. It has gradually grown over the years to have around 2,500 followers and is now considered by the aggregator site feedspot.com to be one of the top astronomy blogs on the internet.  It has also been mentioned on the BBC news website.

Explaining Science contains articles on astronomy, space and space travel – written at a level which is easily accessible to the non-scientist but without being dumbed down. This is often a difficult balance to achieve, but I hope I manage it most of the time.

There are over 160 posts available. To view the most recent click on the icon below


My own favourite posts

I’ve listed below a selection of my posts, which have attracted the greatest interest among my readers and  which I’ve enjoying writing the most. To view any of these posts please click on its hyperlink.

How does GPS work?

The anthropic principle – the idea  that the laws of physics, and the properties of the Universe as a whole, are somehow finely tuned to allow our existence.

Geocentric cosmology  – the obsolete model in which the Earth is the the centre of the Universe and all the planets and stars revolve around it.

October 4 1957 the start of the ‘space age’ with the launch of the first artificial satellite Sputnik 1.

Leap Seconds – the need to periodically add a second to keep accurate clocks in line with solar time.

The cosmic microwave background

The Perseids – the regular meteor shower which occurs around August 12 each year.

Why is the sky blue?

A brief history of the Universe – an outline 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!

Enceladus- Could there be life?  Discusses the likelihood of life on Saturn’s moon Enceladus

I have also written a number of popular astronomy books

Is there anyone out there?  The question of whether or not alien intelligent life exists elsewhere in the Universe has fascinated mankind for hundreds of years. Until relatively recently, this was merely the stuff of science fiction, but since the middle of the twentieth century astronomers have been able to seriously investigate the possibility of there being other civilisations out there, civilisations with whom we could make contact, instead of just speculating.  SETI, the Search for Extra-Terrestrial Intelligence, is a branch of astronomy actively engaged with detecting signs that we are not alone.  This short e-book tells the story of this search. Click here for more details.


For more details on my short e-book on the Moon click here. 

Venus, is  the planet closest to the Earth in distance, size and internal composition, and the third brightest natural object in our sky after the Sun and the Moon.  This book focuses on our sister planet and discusses what we would need to do if, in the far future, humanity were ever to build settlements on it.  It is available as a paperback; for more details click here or for e-book format click here. 


Explaining Science now has a  YouTube Channel. At the moment there are only one or two test videos, while I get the channel up and running. So please view and come back later to view again as the channel develops.