by APOD Robot » Sat May 21, 2022 4:06 am
Planetary Nebula Abell 7
Explanation: Very faint planetary nebula Abell 7 is some 1,800 light-years distant, just south of Orion in planet Earth's skies in the constellation
Lepus, The Hare. Surrounded by Milky Way stars and near the line-of-sight to distant background galaxies, its
generally simple spherical shape, about 8 light-years in diameter, is outlined in
this deep telescopic image. Within its confines are beautiful, more complex details enhanced by the use of
narrowband filters. Emission from hydrogen is shown in reddish hues with oxygen emission mapped to green and blue colors, giving Abell 7 a natural appearance that would otherwise be much too faint to be appreciated
by eye. A
planetary nebula represents a very brief final phase in stellar evolution that our own Sun will experience 5 billion
years hence, as the nebula's central, once sun-like star shrugs off its outer layers. Abell 7 itself is estimated to be 20,000 years old. Its central star is seen here as a
fading white dwarf some 10 billion years old.
[url=https://apod.nasa.gov/apod/ap220521.html] [img]https://apod.nasa.gov/apod/calendar/S_220521.jpg[/img] [size=150]Planetary Nebula Abell 7[/size][/url]
[b] Explanation: [/b] Very faint planetary nebula Abell 7 is some 1,800 light-years distant, just south of Orion in planet Earth's skies in the constellation [url=http://www.allthesky.com/constellations/big/lepus28vm-b.jpg]Lepus, The Hare[/url]. Surrounded by Milky Way stars and near the line-of-sight to distant background galaxies, its [url=http://arxiv.org/abs/1210.6226]generally[/url] simple spherical shape, about 8 light-years in diameter, is outlined in [url=http://www.waid-observatory.com/abell-7-2022-02-20-HOO.html]this deep telescopic image[/url]. Within its confines are beautiful, more complex details enhanced by the use of [url=https://apod.nasa.gov/apod/ap111013.html]narrowband[/url] filters. Emission from hydrogen is shown in reddish hues with oxygen emission mapped to green and blue colors, giving Abell 7 a natural appearance that would otherwise be much too faint to be appreciated [url=https://apod.nasa.gov/apod/ap100506.html]by eye[/url]. A [url=http://en.wikipedia.org/wiki/Planetary_nebula]planetary nebula[/url] represents a very brief final phase in stellar evolution that our own Sun will experience 5 billion [url=http://www.futuretimeline.net/beyond.htm]years hence[/url], as the nebula's central, once sun-like star shrugs off its outer layers. Abell 7 itself is estimated to be 20,000 years old. Its central star is seen here as a [url=https://www.nasa.gov/feature/goddard/2019/citizen-scientist-finds-ancient-white-dwarf-star-encircled-by-puzzling-rings]fading white dwarf[/url] some 10 billion years old.
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