Science

Astronomy on Bloomsday - Out of Space

Duncan Steel Jun 16, 2019

The name of Michael Faraday is well-known in science, for his pioneering work in both chemistry and physics (in particular electricity and magnetism; hence the name of the SI unit of capacitance, the farad). As a postgraduate student at the University of Canterbury I spent many hours working on experimental radio receivers sat inside a large metallic box … Read More

Connecting comets and rubber - Out of Space

Duncan Steel Jun 11, 2019

Comet Grigg-Skjellerup was one of the first such celestial bodies to be visited by a spacecraft, the Giotto probe which was sent on to encounter it in mid-1992 after having first visited the famous Comet Halley in 1986. Comet Grigg-Skjellerup was discovered about a century ago, independently by a New Zealander (John Grigg) and an Australian (Frank Skjellerup). The younger … Read More

The problem of knowing when a lunar year begins and ends - Out of Space

Duncan Steel Jun 05, 2019

The Islamic fast of Ramadan has come to an end, marking the beginning of the tenth month of the religion’s twelve-lunation year and therefore Eid al-Fidr, the ‘Festival of Breaking the Fast’. How the decision is made when each of those months begins and ends depends upon the actual sighting of the crescent new moon in the sky, a highly-complicated … Read More

The 250th anniversary of Cook’s observation of the transit of Venus - Out of Space

Duncan Steel Jun 02, 2019

On June 3rd occurs the 250th anniversary of the transit of Venus across the face of the Sun, the observation of which was the prime purpose behind the expedition of HM Bark Endeavour to the South Pacific, under the command of Lieutenant James Cook. Following the measurements of the transit made by Cook and the mission’s scientists in Tahiti, the … Read More

The Great Eclipse of 1919 - Out of Space

Duncan Steel May 29, 2019

Measurements of photographs obtained during the total solar eclipse of 29th May 1919 were pivotal in demonstrating the veracity of Einstein’s General Theory of Relativity, turning him into a household name. The centenary of that event is now upon us, and well worthy of being remembered.  As I sit here typing on my keyboard, my favourite photo showing myself and … Read More

Tracking CFC emissions: a scientific mystery story - Lately, In Science

Sarah-Jane O'Connor May 23, 2019

Thirty years ago, in May 1989, global leaders gathered in Helsinki to sign into force the Montreal Protocol. You might not be familiar with it by name, but you certainly know its effects: the Montreal Protocol phased out the use of chlorofluorocarbons, or CFCs, and other ozone-depleting substances in an effort to reverse the damage to the ozone layer. It’s … Read More

A new crater on the Moon - Out of Space

Duncan Steel May 21, 2019

The scar on the lunar surface produced when the Israeli space probe ‘Beresheet’ slammed into the Moon on April 11 has just been spotted using an orbiting NASA satellite.  Three nations have so far landed spacecraft on the Moon: the USA, the Soviet Union/Russia, and China. A fourth nation, Israel, has attempted to join this club, but its probe (named Beresheet) … Read More

Talking satellites and space in Washington - Out of Space

Duncan Steel May 16, 2019

The annual beanfeast for the US satellite industry — featuring major participation from European nations and companies in particular — is the SATELLITE congress held at the Washington Convention Center, a few blocks from the White House. It was an amazing event to attend, compared to the sort of low-key conferences we have in New Zealand.  Now I’m back in … Read More