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Two light shields

Save Dark Skies

Home Lighting Guide

Here's how to find exterior residential lighting that's dark-sky friendly.

Save Dark Skies

Good Lighting Fixtures: Where to Get Them

Here's a selection of manufacturers and suppliers of good lighting equipment.

Winter constellations seen in a class 4 or 5 sky

Save Dark Skies

Gauging Light Pollution: The Bortle Dark-Sky Scale

Excellent? Typical? Urban? Use this nine-step scale to rate the sky conditions at any observing site.

Save Dark Skies

Join the Fight Against Light Pollution

Only a tiny fraction of amateur astronomers do anything to help reduce bad outdoor lighting. We need to change that.

Save Dark Skies

Everything You Ever Wanted to Know About Light Pollution

Knowledge is power: here are the facts you need to help you combat light pollution in your neighborhood.

Light pollution illustration.

Save Dark Skies

Light Pollution In The Night Sky

Light pollution has become so pervasive that it compromises the view of the universe for an estimated 90 percent of Americans.

Pro-Am Collaboration

Oops! No Data!

It seems you submitted the Nearby-Supernova AstroAlert Report Form without filling in any of the data fields. Please click your browser's "Back" button, or follow the link below, and try again. Thanks for your interest in Sky & Telescope's AstroAlert!

Pro-Am Collaboration

Thank You!

Thank you for submitting your observing report to Sky & Telescope's AstroAlert service. If we have any questions about your data, we'll contact you by e-mail. Please note that at present we are interested only in reports following up a nearby-supernova alert. Observations in response to other types of alerts…

Pro-Am Collaboration

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It seems that you forgot to supply your old e-mail address, your new one, or both. Please click the "Back" button on your browser, or click the "Change E-mail Address" link below, and try again. Thank you! AstroAlert Main Page | Change E-mail Address

Pro-Am Collaboration

Oops! No Lists Selected

It seems you forgot to check any boxes on the AstroAlert change-of-address form. Please click the "Back" button on your browser, or click the "Change E-mail Address" link below, and try again. Thank you! AstroAlert Main Page | Change E-mail Address

Pro-Am Collaboration

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Pro-Am Collaboration

Thanks for Checking!

Please remember to check your e-mail for a reply from our Majordomo listserv software. It will show you the AstroAlert lists to which you currently subscribe. AstroAlert Main Page | Subscribe | Unsubscribe

Pro-Am Collaboration

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It seems that you forgot to supply an e-mail address or that the address you supplied is invalid. Please click the "Back" button on your browser, or click the "Unsubscribe from AstroAlert" link below, and try again. Thank you! AstroAlert Main Page | Unsubscribe from AstroAlert

Pro-Am Collaboration

Oops! Missing or Invalid E-mail Address

It seems that you forgot to supply an e-mail address or that the address you supplied is invalid. Please click the "Back" button on your browser, or click the "Subscribe to AstroAlert" link below, and try again. Thank you! AstroAlert Main Page | Subscribe to AstroAlert

Pro-Am Collaboration

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Pro-Am Collaboration

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It seems you forgot to check any boxes on the AstroAlert unsubscribe form. Please click the "Back" button on your browser, or click the "Unsubscribe from AstroAlert" link below, and try again. Thank you! Unsubscribe from AstroAlert

Pro-Am Collaboration

Results of Nearby-Supernova AstroAlert Test

Our February 2003 AstroAlert test went very well. Here we report on what we learned, thanks to the enthusiasm and dedication of the test's participants.

Pro-Am Collaboration

TEST - Possible Galactic Supernova!

In February 2003, Sky & Telescope and the SuperNova Early Warning System (SNEWS) conducted a test of the AstroAlert system. Here's what it looked like.

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