Credit & Copyright: Laubing
Explanation:
Blown by fast winds from a hot, massive star,
this
cosmic bubble is huge.
Cataloged as
Sharpless 2-308
it lies some 5,200 light-years away toward the constellation of
the Big Dog
(Canis
Major) and covers slightly more of the sky than a Full Moon.
That corresponds to a diameter of 60
light-years at its estimated distance.
The massive star that created the bubble, a
Wolf-Rayet
star, is the bright one near the center of the nebula.
Wolf-Rayet
stars have over 20 times the mass of the Sun
and are thought to be in a brief,
pre-supernova phase of massive star
evolution.
Fast winds from this
Wolf-Rayet
star create the bubble-shaped nebula as they
sweep up slower moving material from an earlier phase of evolution.
The windblown nebula has an age of about
70,000
years.
Relatively faint emission captured in the expansive image
is dominated by the glow of ionized oxygen atoms
mapped to a blue hue.
SH2-308 is also known as The Dolphin Nebula.
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 |
Январь Февраль Март Апрель Май Июнь Июль Август Сентябрь Октябрь Ноябрь Декабрь |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Публикации с ключевыми словами:
туманность - звезды Вольфа-Райе - звездный ветер - Wolf-Rayet star
Публикации со словами: туманность - звезды Вольфа-Райе - звездный ветер - Wolf-Rayet star | |
См. также:
Все публикации на ту же тему >> |