Plotting the Path of Light: From the burning Ebers of a Camp Fire to the Glow of the Smartphone
And there was Light!
Sunlight has been around since the creation of our planet. Apart from heating the atmosphere, it’s essential in all we do. Allthough we frequently complain about light pollution, we can’t imagine living in complete darkness. ‘Lost in Light‘ – how light pollution affects the nightly sky – was a movie I wrote about earlier. Watch it, it’s amazing!
Shaped by Light
Have you ever thought about how light shaped human being over time? The short animation film on top of this blogpost helps you to understand the path of light over centuries. From the burning ebers of a campfire towards a lighthouse beacon and the articifial light glow of a smartphone. Join us on this history of light!
HOW DOES LIGHT POLLUTION AFFECT THE NIGHTLY SKY AND OUR LIVES?
‘Lost in Light’ is a short film on how light pollution affects the view of the night skies. Shot by Sriram Murali, most shots were taken in California, USA. The movie shows how the view gets progressively better as you move away from the artificial lights.
Finding locations to shoot at every level of light pollution ‘s been quite a challenge for the videographer and getting to the darkest skies with no pollution was a journey on its own.
The night skies remind us of our place in the universe. Imagine if we live under skies full of stars as a tiny part of the cosmos. Imagine kids growing up passionate about astronomy looking for answers.
In reality, most of us live under heavily light polluted skies and some have never even seen the Milky Way. We take the skies for granted and are rather lost in our busy lives without much care for the view of the stars.
Take a moment to ‘break out’ and lose yourself in this wonderful movie!
Remember watching fireflies light up your back yard on hot summer nights? Fireflies are beautiful, mysterious, and magical. Firefly populations are dwindling all over the world. Here’s a small post on these magical creatures – the most efficient lights in the world!
Fireflies Talk: the Language of Light
Fireflies emit light mostly to attract mates, although they also communicate for other reasons as well, such as to defend territory and warn predators away. In some firefly species, only one sex lights up. Howeer, in most situations the both sexes glow. Very often the male will fly, while females will wait in trees and grasses to spot an attractive male. If she finds one, she’ll signal it with a flash of her own.
Scientists believe they may flash to drive away predators, claim territory, and communicate with others of their species as well—although the finer points of their language have never been studied extensively. One thing’s for sure, though: without those flashing lights, there could be no fireflies.
Fireflies produce “cold light”
Firefly lights are the most efficient lights in the world—100% of the energy is emitted as light. Compare that to an incandescent bulb, which emits 10% of its energy as light and the rest as heat, or a fluorescent bulb, which emits 90% of its energy as light. Because it produces no heat, scientists refer to firefly lights as “cold lights.”
Fireflies – How does it Work?
In a firefly’s tail, you’ll find two chemicals: luciferase and luciferin. Luciferin is heat resistant, and it glows under the right conditions. Luciferase is an enzyme that triggers light emission. ATP, a chemical within the firefly’s body, converts to energy and initiates the glow. All living things, not just fireflies, contain ATP.
Fireflies have a short ‘Lifespan’
To stay a bit in ‘the language of light’: the lifespan of fireflies isn’t that long as you may expect. Although being very low consumers of energy with a high eficacy, an adult firefly lives only long enough to mate and lay eggs—so they may not need to eat during their adult life stage. The larvae usually live for approximately one year, from mating season to mating season, before becoming adults and giving birth to the next generation.
Fireflies – what’s more?
There’s certainly many more to say about these intriguing creatures, but let’s finish with a great movie with night and day timelapses and some references. Enjoy!