Tagged: astronomy

Night lights of NZ from orbit - Out of Space

Duncan Steel Oct 10, 2019

New Zealand has prided itself for decades with regard to its lack of pollution, and all will be aware that the ‘100% Pure New Zealand‘ meme is under threat through land, water and air pollution of various causes. There is another type of contamination that the country also faces: light pollution. Astronomers are concerned that the dark skies of … Read More

Interstellar comet update - Out of Space

Duncan Steel Sep 19, 2019

The discovery of a true interstellar comet – a comet passing through the solar system having arrived, presumably, after having been thrown out of some other planetary system orbiting another star – re-opens a long-debated question in science: is life unique to Earth, or is it common in the galaxy? The panspermia hypothesis holds that life is common in the … Read More

New interstellar comet discovered - Out of Space

Duncan Steel Sep 13, 2019

Astronomers have searched over many decades for comets that have come from interstellar space, perhaps from a planetary system orbiting a nearby star in the Milky Way. A blank was drawn in this quest for a long, long time… and now, similarly to London buses, two have come along almost at once. The diagram at the head of this post … Read More

An invitation to name a star and a planet - Out of Space

Duncan Steel Sep 04, 2019

The International Astronomical Union (IAU) — the global organisation of professional astronomers — is marking its centenary this year by inviting different nations to propose names for both a distant star, and a planet found to orbit it (a so-called exoplanet). Anyone can suggested a moniker, for the star, for the planet, or both. So: calling all New Zealanders to … Read More

The Equation of Time - Out of Space

Duncan Steel Jul 14, 2019

The solstice on June 22nd marked the shortest duration of sunlight (or day length) during this year. One might have expected that from that date sunrise would have started getting earlier; and prior to that date sunset to have been consistently getting earlier (as the daylight duration was shortening). In fact the latest sunrise did not occur until almost a … Read More

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 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

Happy New Year (and a missed Easter) - Out of Space

Duncan Steel Mar 25, 2019

As I write it is March 25th, which was the date of New Year in Great Britain and its colonies until 1752. Indeed, throughout history it was a common date for the start of the civil year in a wide range of European states and principalities, being the traditional date of the vernal equinox, and so the beginning … Read More