Credit & Copyright: Wah!
Explanation:
Do stars appear dimmer when nearer the horizon?
Yes -- atmospheric air absorbs and reradiates light, so that the greater the
airmass through which
one peers, the fainter an object will appear.
Pictured above in a multi-frame image, stars, the planet
Jupiter, and even the Moon show the
horizon-dimming effects of Earth's nearly-transparent atmosphere.
The image was taken in the evening about three weeks ago over
Hong Kong,
China.
The brightest streak near the center is the
setting Moon,
while intermittent thin clouds sometimes dispersed moonlight into a
larger halo.
Jupiter sets just to the Moon's right.
The dim steaks cutting across the image horizontally were caused by
passing airplanes.
The bright strange multi-pronged streak over the house is a helicopter taking off.
An astute observer will also notice faint rays emanating from near the horizon.
Their cause is unknown, but may be
crepuscular rays caused by the Sun shining through gaps
in thick clouds.
New Mirror:
APOD now available in Romanian
from Romania
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
Yanvar' Fevral' Mart Aprel' Mai Iyun' Iyul' Avgust Sentyabr' Oktyabr' Noyabr' Dekabr' |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
|
Publikacii s klyuchevymi slovami:
Moon - Luna - nochnoe nebo
Publikacii so slovami: Moon - Luna - nochnoe nebo | |
Sm. takzhe:
Vse publikacii na tu zhe temu >> | |
