by APOD Robot » Thu May 16, 2019 4:08 am
Dark Skies: Turn on the Night
Explanation: Have you ever experienced a really dark night sky? One common and amazing feature is the glowing band of our
Milky Way galaxy stretching from horizon to horizon. If you live in or near a big city, though, you might not know this
because city lights reflecting off the
Earth's atmosphere could only
allow you to see the Moon and a few stars. Today, however, being
UNESCO's
International Day of Light, the
International Astronomical Union is asking people to
Turn on the Night by trying to better understand, and in the future better reduce,
light pollution. You can practice even now by going to the main
APOD website at NASA and hovering your cursor over the [url=
https://apod.nasa.gov/apod/image/1905/T ... </a>Before image</a>. The <a href="image/1905/TotnAfter_Dai_3000.jpg]After[/url] picture that comes up is a panorama of four exposures taken with the same camera and from the same location, showing what
happened recently in
China when people in
Kaihua County decided to turn down many of their lights. Visible in the
Before picture are the stars Sirius (left of center) and Betelgeuse, while visible in the
After picture are thousands of stars with the arching band of our Milky Way Galaxy. Humanity has lived for millennia under a
dark night sky, and connecting to it has
importance for both natural and cultural heritage.
[url=https://apod.nasa.gov/apod/ap190516.html] [img]https://apod.nasa.gov/apod/calendar/S_190516.jpg[/img] [size=150]Dark Skies: Turn on the Night[/size][/url]
[b] Explanation: [/b] Have you ever experienced a really dark night sky? One common and amazing feature is the glowing band of our [url=https://apod.nasa.gov/apod/ap070508.html]Milky Way galaxy stretching[/url] from horizon to horizon. If you live in or near a big city, though, you might not know this [url=https://apod.nasa.gov/apod/ap160630.html]because city lights[/url] reflecting off the [url=https://www.nasa.gov/sites/default/files/images/662995main_upper-atmosphere-MOS_full.jpg]Earth's atmosphere[/url] could only [url=https://petapixel.com/2017/02/09/light-pollution-changes-view-orion-constellation/]allow you to see[/url] the Moon and a few stars. Today, however, being [url=https://en.unesco.org/about-us/introducing-unesco]UNESCO[/url]'s [url=https://www.lightday.org/events]International Day of Light[/url], the [url=https://www.iau.org/administration/about/]International Astronomical Union[/url] is asking people to [url=https://mailchi.mp/laserclassroom.com/turnonthenight]Turn on the Night[/url] by trying to better understand, and in the future better reduce, [url=https://en.wikipedia.org/wiki/Light_pollution#Effect_on_astronomy]light pollution[/url]. You can practice even now by going to the main [url=http://apod.nasa.gov/]APOD website at NASA[/url] and hovering your cursor over the [url=https://apod.nasa.gov/apod/image/1905/TotnBefore_Dai_3000.jpg"</a>Before image</a>. The <a href="image/1905/TotnAfter_Dai_3000.jpg]After[/url] picture that comes up is a panorama of four exposures taken with the same camera and from the same location, showing what [url=http://www.twanight.org/newTWAN/news.asp?newsID=6111]happened recently[/url] in [url=https://en.wikipedia.org/wiki/China]China[/url] when people in [url=https://en.wikipedia.org/wiki/Kaihua_County]Kaihua County[/url] decided to turn down many of their lights. Visible in the [url=https://apod.nasa.gov/apod/image/1905/TotnBefore_Dai_3000.jpg]Before picture[/url] are the stars Sirius (left of center) and Betelgeuse, while visible in the [url=https://apod.nasa.gov/apod/image/1905/TotnAfter_Dai_3000.jpg]After picture[/url] are thousands of stars with the arching band of our Milky Way Galaxy. Humanity has lived for millennia under a [url=https://www.iau-100.org/dark-skies-for-all]dark night sky[/url], and connecting to it has [url=https://www.globeatnight.org/]importance[/url] for both natural and cultural heritage.
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