Astronomers fighting light pollution have high hopes this well-heeled coastal retreat will become home to the Southern Hemisphere’s first accredited urban dark sky reserve.
Researchers in Macquarie University’s Department of Physics and Astronomy are currently gathering data that could see Palm Beach, at the tip of Sydney's
Northern Beaches, establish itself as an official sanctuary against the growing global problem of light pollution.
“Very few people would consider light as a dangerous thing, but it’s actually one of the fastest growing pollutants in the world, with light pollution
growing at average yearly rate of two percent,” explained Macquarie University astronomer Dr Richard McDermid.
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“Aside from the obvious impacts on our astronomical research, light pollution also has some really concerning impacts on human health and our environment.
Research has shown that it is interrupting animal breeding cycles, especially in nocturnal species, and we’re only just starting to understand the
impacts of artificial light on the human brain.
Led by Macquarie University astronomer Dr Richard McDermid, scientists are making a case to the Northern Beaches Council to establish a light pollution-free sanctuary over Palm Beach. (Image: Macquarie University)
Dark sky reserves -- also sometimes called dark sky parks or dark sky sanctuaries -- are designated areas where optimal levels of darkness can be preserved
and protected against artificial light pollution.
“The first International Dark Sky Park in the southern hemisphere was created here in Australia three years ago, in the Warrumbungle National Park in New
South Wales,” McDermid said.
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“As an accredited reserve, it is protected by planning guidelines which restrict artificial light within 200 kilometres of the site, which includes the
Siding Spring Observatory -- home to Australia’s largest optical telescopes.”
Under Dr McDermid’s supervision, Macquarie University’s team is gathering the necessary data for the Northern Beaches Council to make a case for the establishment
of a reserve in Palm Beach. The area is home to a colony of micro bats which are particularly vulnerable to the effects of light pollution .
“The tip of Palm Beach, up to the Barrenjoey Lighthouse, is quite dark,” McDermid said. “What we’re doing is are measuring the exact levels against what
is considered a baseline optimal level of darkness, once natural light sources are factored in.”
Macquarie University scientists want the skies above Palm Beach become Sydney's first urban dark sky reserve. (Image: Visit Sydney.)
Seeing the light on light pollution
In a city where developers are increasingly clambering for new land, McDermid said that establishing designated pockets of darkness in Sydney is important
-- not only to protect residents and local ecology, but to help educate people about the effects of light pollution.
“Even something as seemingly innocent as the uplights that illuminate people’s gardens at night -- it’s all cumulatively contributing to increased amounts
of artificial light in our night sky," he said.
“People just aren’t aware of the impact.”
Another problem is the growing use of LED lighting -- an environmental ‘good guy’ with an unfortunate downside.
As part of their anti-light pollution project, the Macquarie team measures night-time darkness levels at Sydney’s Palm Beach. (Image: Macquarie University)
“While LED lights are great in terms of energy saving, they can contain a lot more blue light, which scatters much more than warm light and contributes
more to light pollution,” McDermid said.
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As a Board Director of the Australasian Dark Sky Alliance – a rather Star-Wars-y sounding organisation dedicated to reducing light pollution --
McDermid is part of an interdisciplinary movement that is bringing together everyone with a stake in the preservation of the nighttime sky, to draw
attention to these mostly unknown effects of artificial light.
“We’re looking at things like developing a ‘seal of approval’ for lighting fixtures that emit low levels of light pollution,” he said.
“But our first step is awareness.
“The good news is, fixing light pollution is amazingly simple -- you just turn off the light, and it’s gone. But people have to flick that switch.”
This article was first published on the Macquarie University Lighthouse.