Ken Walczak

@stellarmorticia Beautiful photo! Too bad there’s so much dust on the lens. Oh, wait! Are those the sturs (sp?) I’ve heard so much about? I’ve lived Chicago too long. Hope you’re loving those nights!

Day 111: Make a wish! Photo taken in the central idaho dark sky reserve by UCLA students.

For anyone still on whatever this platform is now, our paper on land use and light emission as observed from a high altitude balloon mission is now available! You can access it here: authors.elsevier.com/a/1hWiD564SXoRB

Is stargazing a financial luxury? idachicago.org/resources/is-s…

@JenniferYuen1 @StBrianAerial And low flying planes!

@KWalzar @StBrianAerial That's going to cause an accident by blinding a driver coming in the opposite direction.

How?! How is this not illegal? This car was a block away and this is the light it cast in our house. And I live on the 2nd floor! @StBrianAerial

@darkskychi Talk went great! Over 100 people there to hear about the importance of natural nights, the Palos UNSP and how to address light pollution for all of us animals. We may have some new @darkskychi recruits!

Join @darkskyCHI 's @KWalzar at the Wild Things 2023 Conference in Rosemont IL this coming Saturday 25 Feb to hear more about The Dark Side of Nature: Protecting the Nighttime Environment buff.ly/3EpgUlS #darksky

Good evening @chicago! This is spectacular you (*) at 7:22pm tonight when the @Space_Station passed you by 260 miles above. @NWSChicago @ABC7Chicago @WGNNews @nbcchicago @FOX40 Jan 30, 2023 (*) A few more cities too

@RestoringDrknss Did you know that light pollution is limiting our ability to detect potentially hazardous asteroids? doi.org/10.1093/mnras/… If ground based observatories can’t see them coming we’re no better than dinosaurs. Turn down the lights and protect the planet!

The milky way is nice, but have you considered being aware of asteroids approaching the planet? apnews.com/article/scienc…

You thought #lightpollution was bad for your health now? Wait till an #asteroid hits you and no one can see it in time to tell Bruce Willis. #michaelbay #Armageddon #meteorstrike

Amazing talk with stunning visuals at today’s #AGU22 plenary by @BabakTafreshi Let’s hope it inspired more researchers to consider #ALAN as an environmental issue.

@TheCosmicRey @theAGU Me too!

Anyone here is at @theAGU #AGU22?

@ActeLum @JohnBarentine @MayorFrey Oops, Austin is on the right. The georeferencing was me.

@ActeLum @JohnBarentine @MayorFrey On the left is the city of Oak Park and the Chicago neighborhood of Austin on the left. The crime data is from icpsr.umich.edu and data.cityofchicago.org

"Feeling safe" does not necessarily mean actual safety. And that's a lot of money to spend on making people feel safe in the absence of real safety. startribune.com/minneapolis-ai…

@JohnBarentine @MayorFrey Is lighting the solution to crime or a panacea? Here is an unedited 2016 ISS image of two neighborhoods in and next to Chicago and the number of reported crimes that year.

Also, @MayorFrey: your statement that "criminals fear a well-lit street" is unfounded in fact. I can show you plenty of studies to the contrary. If you're interested in learning what street lighting actually *can* do for communities, have someone on your staff contact me.

Can you spot the difference? 🧐 These images were taken by European astronauts from the International @Space_Station 10 years apart, 400 km above #Earth. They are the best source for scientists to map #LightPollution. 📸 @nasa/@esa – @astro_andre + @AstroSamantha/@cities4tnight

The rare time Chicago streetlights aren’t a significant contributor to light pollution 🙄

@JohnBarentine Are you thinking about a legal definition? If so the word “artificial” needs a lot of clarification. “ALAN” does not distinguish between useful or polluting light. Also the light on a microwave display is artificial, light, at night per the words. So… yes.

So, speaking of cases, what say you all? What's your verdict? And are any of you all sciency folk interested in writing a short paper with me about it?

Light Pollution Twitter: have we any consensus definition of "artificial light at night"? I was asked today to define it but couldn't immediately come up with anything precise. And I didn't find anything in the scholarly literature. Is the phrase itself the definition?

@remiboucher @JohnBarentine @USherbrooke Yay! Congrats and welcome to the UNSP family.

Well-deserved and a long time in coming. Félicitations pour votre succès!

@skyglowberlin Mission accomplished. I’m teased!

My appearance on the @RestoringDrknss podcast just dropped. What can we learn from observing LP from the stratosphere? How can we get the lighting industry on board? (A nod to @skyglowberlin for inspiring many aspects of our work @AdlerPlanet) restoringdarkness.com/episodes/49-li…