SpaceX Starlink Satellites

Many of you will have seen the pictures last year showing long ‘trains’ composed of as many as sixty SpaceX Starlink satellites crossing the sky. A 'train' of SpaceX Starlink satellites just after their launch. In the days after launch these trains break up as the satellites position themselves into their final orbits These satellites… Continue reading SpaceX Starlink Satellites

Free e-book on Venus and how to Terraform it

Merry Christmas! With Christmas coming up I’d  like to give a free gift to all my readers. My e-book 'Venus and how to Terraform it' will be available free in the Kindle bookstore for five days from today  (19 December 2019).  To get your FREE copy please click on the link below . Get free… Continue reading Free e-book on Venus and how to Terraform it

The evenings are drawing out already

Although there is still a week to go until the December solstice, the evenings are already starting to draw out. I have decided to re-blog an edited version of my 2015 post on this topic. ------------------------------ As I complete this post, it's completely dark outside and it's only 5 o'clock in the afternoon; most people… Continue reading The evenings are drawing out already

The discovery of dark energy

In this post I talk about the unexpected finding made in the late 1990’s that the rate of expansion of the Universe is increasing due to dark energy. This was totally unexpected and won its discoverers the Nobel prize for physics. (This article is one my series on cosmology - the study of the origin… Continue reading The discovery of dark energy

Jim Peebles winner of the Noble Prize 2019

I was interested to hear that Jim Peebles, at the age of 84,  has won a half share of the 2019 Noble Prize for physics for theoretical discoveries in physical cosmology. Jim Peebles (1935-) Image from Wikimedia commons In the early 1960s Peebles and his colleague Robert Dicke had predicted the existence of the microwave… Continue reading Jim Peebles winner of the Noble Prize 2019