13 February 2012 - 1:47 am NZ time
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Astronomers Alan Gilmore and Grant Christie look back at the early days of optical astronomy in New Zealand. (12′54″)
NIWA scientists discuss adding iron to the ocean as a way of triggering algal blooms and the uptake of carbon. (17′16″)
DOC's Colin Miskelly and Graham Taylor explain the latest update on New Zealand's threatened birds. (13′00″)
The Smithsonian curator for palaeobiology, Scott Wing, on how plants and animals changed during a warming 50 million years ago. (10′28″)

The Milky Way, as seen from the Mt. John Observatory.
Four centuries after Galileo Galilei first pointed his home-made telescope towards the night sky, the world is celebrating the International Year of Astronomy. To mark the event, Our Changing World talks to astronomers and cosmologists in New Zealand about some of the most exciting research projects in the Southern Hemisphere.
In this first part of the series, astronomers Grant Christie, from Auckland's Stardome Observatory, and Alan Gilmore, from the University of canterbury's Mt John Observatory (pictured on the right) near Lake Tekapo, discuss the early days of optical astronomy in New Zealand.
Both images are courtesy of Fraser Gunn.For further information visit www.mackenziesky.co.nz
Looking north from the Church of the Good Shepherd throughout the night. Visible constellations include Gemini, Cancer, Leo and Virgo. The bright star appearing in the upper right corner in the middle of the animation is planet Saturn.They are compositions of hundreds of still photographs, taken and compiled together by Fraser Gunn.
This video is used with permission and is subject to strict copyright conditions. Copyright Fraser Gunn. For further information visit www.mackenziesky.co.nz.
Presenters:
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Alison Ballance
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Ruth Beran
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Veronika Meduna
A mix of in depth interviews, packages and sound rich features, Our Changing World covers topics across all scientific disciplines, natural history and environmental issues, and developments in health as well as exploring the human side of science and the personalities behind it.
email: ourchangingworld@radionz.co.nz
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