The Space Shuttle 10 years on

Ten years ago, on 8 July 2011 Atlantis took off for the final mission of a Space Shuttle, bringing to close a programme which had lasted nearly 40 years  and had cost the equivalent of $220 billion in 2021 dollars. In this post I'll review this fascinating and unique piece of technology. The landing of… Continue reading The Space Shuttle 10 years on

June 21 2021 – the solstice

This year, the June solstice will fall on 21 June.  In the northern hemisphere, it is the day when there is the most daylight and when the Sun is at its highest in the midday sky. The origin of the word solstice is from two Latin words:  sol, which means Sun, and sistere, to stand still. On the… Continue reading June 21 2021 – the solstice

Satellite Navigation

Satellite navigation systems have come to affect countless aspects of our daily lives, from directing our holiday aeroplanes to enabling us to drive round an unfamiliar city without any map other than the one on our mobile phone. Most new cars sold today have an inbuilt Sat Nav and you can buy trackers relatively cheaply… Continue reading Satellite Navigation

Cosmic Horizons

Although the Universe may be infinite in extent, in the generally accepted Big Bang cosmology we can only see a small fraction of it. This is known as the observable universe. Field of distant galaxies - Image Credit NASA  There are three widely used definitions of cosmological horizons, which are limits imposed by cosmology to… Continue reading Cosmic Horizons

Easter April 4 2021

This year, for the majority of the world’s Christians, 4 April is Easter Sunday, one of the most important dates in the calendar. Although because of the current restrictions due to the Covid pandemic, celebrations will be a little limited in many places. Although Easter is the festival celebrating the resurrection of Jesus Christ from the dead,… Continue reading Easter April 4 2021