Credit & Copyright: Vikas Chander
Explanation:
Very faint planetary nebula Abell 7 is about 1,800 light-years distant.
It lies just south of Orion in planet Earth's skies toward 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 revealed in
this deep telescopic image.
Within the cosmic cloud are beautiful and complex structures though,
enhanced by the use of long exposures and
narrowband filters
that capture emission from hydrogen, sulfur, and oxygen atoms.
Otherwise Abell 7 would 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.
But its central star, seen here as a
fading white dwarf,
is some 10 billion years old.
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 2025 |
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.
Based on Astronomy Picture
Of the Day
|
Publikacii s klyuchevymi slovami:
planetary nebula - white dwarf
Publikacii so slovami: planetary nebula - white dwarf | |
Sm. takzhe:
Vse publikacii na tu zhe temu >> | |
