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Points of Light has more than 250 affiliates in 30 countries and partnerships with thousands of nonprofits and companies dedicated to volunteer service around the world. In 2012, Points of Light mobilized 4 million volunteers in 30 million hours of service worth $635 million. See also. United States portal
The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon . Natural light sources in a night sky include moonlight, starlight, and airglow, depending on location and timing. Aurorae light up the skies above the ...
limiting magnitude with 12.5" reflector is 15.2; 5 Suburban sky 5.6–6.0 19.25–20.3 only hints of zodiacal light are seen on the best nights in autumn and spring; light pollution is visible in most, if not all, directions; clouds are noticeably brighter than the sky; the Milky Way is invisible near the horizon, and looks washed out overhead.
It has an integrated magnitude of 10.5 and is 1500 light-years from Earth. The variable star V380 Orionis is embedded in NGC 1999. Another famous nebula is IC 434, the Horsehead Nebula, near ζ Orionis. It contains a dark dust cloud whose shape gives the nebula its name. NGC 2174 is an emission nebula located 6400 light-years from Earth.
In astronomy, the fixed stars ( Latin: stellae fixae) are the luminary points, mainly stars, that appear not to move relative to one another against the darkness of the night sky in the background. This is in contrast to those lights visible to naked eye, namely planets and comets, that appear to move slowly among those "fixed" stars.
Electromagnetic spectrum. The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to high frequency these are: radio waves, microwaves, infrared, visible light ...
The day 's blue sky, clouds and the Moon. The sky is an unobstructed view upward from the surface of the Earth. It includes the atmosphere and outer space. It may also be considered a place between the ground and outer space, thus distinct from outer space. In the field of astronomy, the sky is also called the celestial sphere.
In 29 seconds, Sirius appears to move 7.5 arcminutes from left to right. Twinkling, also called scintillation, is a generic term for variations in apparent brightness, colour, or position of a distant luminous object viewed through a medium. [1] If the object lies outside the Earth's atmosphere, as in the case of stars and planets, the ...