s*****t
发帖数: 1994 | 1 IC 5146: The Cocoon Nebula
Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT
Explanation: How did this nebula get created? The Cocoon Nebula, cataloged as IC 5146, is
a strikingly beautiful nebula located about 4,000 light years away toward the constellation of
Cygnus. Inside the Cocoon is a newly developing open cluster of stars. Like other stellar
nurseries, the Cocoon Nebula is, at the same time, an emission nebula, a reflection nebula,
and an absorption nebula. |
|
s*****t
发帖数: 1994 | 2 IC 5146: The Cocoon Nebula
Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT
Explanation: How did this nebula get created? The Cocoon Nebula, cataloged as IC 5146, is
a strikingly beautiful nebula located about 4,000 light years away toward the constellation of
Cygnus. Inside the Cocoon is a newly developing open cluster of stars. Like other stellar
nurseries, the Cocoon Nebula is, at the same time, an emission nebula, a reflection nebula,
and an absorption nebula. |
|
s*****t
发帖数: 1994 | 3 NGC 6369: The Little Ghost Nebula
Credit: Hubble Heritage Team, NASA
Explanation: This pretty planetary nebula, cataloged as NGC 6369, was discovered by 18th
century astronomer William Herschel as he used a telescope to explore the constellation
Ophiucus. Round and planet-shaped, the nebula is also relatively faint and has acquired the
popular moniker of Little Ghost Nebula. Planetary nebulae in general are not at all related to
planets, but instead are created at the end of a |
|
s*****t
发帖数: 1994 | 4 The Egg Nebula in Polarized Light
Credit: Hubble Heritage Team (STScI/AURA), W. Sparks (STScI) & R. Sahai (JPL), NASA
Explanation: Where is the center of the unusual Egg Nebula? Like a baby chick pecking its
way out of an egg, the star in the center of the Egg Nebula is casting away shells of gas and dust
as it slowly transforms itself into a white dwarf star. The Egg Nebula is a rapidly evolving
pre-planetary nebula spanning about one light year toward the constellation of Cygnus. Thick
dust, t |
|
s*****t
发帖数: 1994 | 5 The Rosette Nebula
Credit & Copyright: Richard Crisp (narrowbandimaging.com)
Explanation: Would the Rosette Nebula by any other name look as sweet? The bland New General Catalog designation of NGC 2237 doesn't appear to diminish the appearance of the this flowery emission nebula. Inside the nebula lies an open cluster of bright
young stars designated NGC 2244. These stars formed about four million years ago from the nebular material and their stellar winds are clearing a hole in the nebula's cen |
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c***s
发帖数: 51 | 6 The Rosette Nebula
Credit & Copyright: Robert Gendler
Explanation: Would the Rosette Nebula by any other name look as sweet? The
bland New General Catalog designation of NGC 2237 doesn't appear to diminish
the appearance of the this flowery emission nebula. Inside the nebula lies
an open cluster of bright young stars designated NGC 2244. These stars
formed about four million years ago from the nebular material and their
stellar winds are clearing a hole in the nebula's center, insulated by a
lay |
|
s*****t
发帖数: 1994 | 7 NGC 6369: The Little Ghost Nebula
Credit: Hubble Heritage Team, NASA
Explanation: This pretty planetary nebula, cataloged as NGC 6369, was discovered by 18th
century astronomer William Herschel as he used a telescope to explore the constellation
Ophiucus. Round and planet-shaped, the nebula is also relatively faint and has acquired the
popular moniker of Little Ghost Nebula. Planetary nebulae in general are not at all related to
planets, but instead are created at the end of a |
|
s*****t
发帖数: 1994 | 8 The Egg Nebula in Polarized Light
Credit: Hubble Heritage Team (STScI/AURA), W. Sparks (STScI) & R. Sahai (JPL), NASA
Explanation: Where is the center of the unusual Egg Nebula? Like a baby chick pecking its
way out of an egg, the star in the center of the Egg Nebula is casting away shells of gas and dust
as it slowly transforms itself into a white dwarf star. The Egg Nebula is a rapidly evolving
pre-planetary nebula spanning about one light year toward the constellation of Cygnus. Thick
dust, t |
|
s*****t
发帖数: 1994 | 9 The Rosette Nebula
Credit & Copyright: Richard Crisp (narrowbandimaging.com)
Explanation: Would the Rosette Nebula by any other name look as sweet? The bland New General Catalog designation of NGC 2237 doesn't appear to diminish the appearance of the this flowery emission nebula. Inside the nebula lies an open cluster of bright
young stars designated NGC 2244. These stars formed about four million years ago from the nebular material and their stellar winds are clearing a hole in the nebula's cen |
|
c***s
发帖数: 51 | 10 The Rosette Nebula
Credit & Copyright: Robert Gendler
Explanation: Would the Rosette Nebula by any other name look as sweet? The
bland New General Catalog designation of NGC 2237 doesn't appear to diminish
the appearance of the this flowery emission nebula. Inside the nebula lies
an open cluster of bright young stars designated NGC 2244. These stars
formed about four million years ago from the nebular material and their
stellar winds are clearing a hole in the nebula's center, insulated by a
lay |
|
s*****t
发帖数: 1994 | 11 The Pelican in the Swan
Credit & Copyright: Robert Gendler
Explanation: The Pelican Nebula, also known as IC 5070, lies about 2,000 light-years away
in the high and far-off constellation of Cygnus, the Swan. This picture spans a portion of the
magnificent nebula about 30 light-years wide. Fittingly, this cosmic pelican is found just off
the east "coast" of the North America Nebula, another surprisingly familiar looking
emission nebula in Cygnus. In fact, the Pelican and North |
|
s*****t
发帖数: 1994 | 12 The Dumbbell Nebula in Hydrogen and Oxygen
Credit & Copyright: George Jacoby (NOAO) et al., WIYN, AURA, NOAO, NSF
Explanation: The first hint of what will become of our Sun was discovered inadvertently in
1764. At that time, Charles Messier was compiling a list of "annoying" diffuse objects not to
be confused with "interesting" comets. The 27th object on Messier's list, now known as M27
or the Dumbbell Nebula, is a planetary nebula, the type of nebula our Sun will produce when
nuclear fusion |
|
s*****t
发帖数: 1994 | 13 The Eagle Nebula for CFHT
Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT
Explanation: Bright blue stars are still forming in the dark pillars of the Eagle Nebula. Made
famous by a picture from the Hubble Space Telescope in 1995, the Eagle Nebula shows the
dramatic process of star formation. To the upper right of the nebula in the above picture lies
the heart of the open cluster M16. The bright blue stars of M16 have been continually
forming over the past 5 milli |
|
s*****t
发帖数: 1994 | 14 NGC 7293: The Helix Nebula
Credit: NASA, NOAO, ESA, Hubble Helix Nebula Team, M. Meixner (STScI), & T. A.
Rector (NRAO)
Explanation: Will our Sun look like this one day? The Helix Nebula is the closest example of
a planetary nebula created at the end of the life of a Sun-like star. The outer gasses of the star
expelled into space appear from our vantage point as if we are looking down a helix. The
remnant central stellar core, destined to become a white dwarf star, gl |
|
s*****t
发帖数: 1994 | 15 Dumbbell Nebula Halo
Credit & Copyright: Robert Gendler
Explanation: In 1764, French astronomer Charles Messier sighted this gorgeous cosmic
cloud which he described as an oval nebula without stars. Cataloged as M27, it is now
popularly known as the Dumbbell Nebula, not for its substandard academic performance but
for the elongated shape, like a bar with weights on each end, which first caught Messier's eye.
This deep image of the bright planetary nebula does reveal the Dumbel |
|
s*****t
发帖数: 1994 | 16 The Cat's Eye Nebula from Hubble
Credit: NASA, ESA, HEIC, and The Hubble Heritage Team (STScI/AURA)
Explanation: Staring across interstellar space, the alluring Cat's Eye
nebula lies three thousand light-years from Earth. A classic planetary
nebula, the Cat's Eye (NGC 6543) represents a final, brief yet glorious
phase in the life of a sun-like star. This nebula's dying central star may
have produced the simple, outer pattern of dusty concentric shells by
shrugging off outer layers in a series of |
|
s*****t
发帖数: 1994 | 17 The Pelican in the Swan
Credit & Copyright: Robert Gendler
Explanation: The Pelican Nebula, also known as IC 5070, lies about 2,000 light-years away
in the high and far-off constellation of Cygnus, the Swan. This picture spans a portion of the
magnificent nebula about 30 light-years wide. Fittingly, this cosmic pelican is found just off
the east "coast" of the North America Nebula, another surprisingly familiar looking
emission nebula in Cygnus. In fact, the Pelican and North |
|
s*****t
发帖数: 1994 | 18 The Dumbbell Nebula in Hydrogen and Oxygen
Credit & Copyright: George Jacoby (NOAO) et al., WIYN, AURA, NOAO, NSF
Explanation: The first hint of what will become of our Sun was discovered inadvertently in
1764. At that time, Charles Messier was compiling a list of "annoying" diffuse objects not to
be confused with "interesting" comets. The 27th object on Messier's list, now known as M27
or the Dumbbell Nebula, is a planetary nebula, the type of nebula our Sun will produce when
nuclear fusion |
|
s*****t
发帖数: 1994 | 19 The Eagle Nebula for CFHT
Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT
Explanation: Bright blue stars are still forming in the dark pillars of the Eagle Nebula. Made
famous by a picture from the Hubble Space Telescope in 1995, the Eagle Nebula shows the
dramatic process of star formation. To the upper right of the nebula in the above picture lies
the heart of the open cluster M16. The bright blue stars of M16 have been continually
forming over the past 5 milli |
|
s*****t
发帖数: 1994 | 20 NGC 7293: The Helix Nebula
Credit: NASA, NOAO, ESA, Hubble Helix Nebula Team, M. Meixner (STScI), & T. A.
Rector (NRAO)
Explanation: Will our Sun look like this one day? The Helix Nebula is the closest example of
a planetary nebula created at the end of the life of a Sun-like star. The outer gasses of the star
expelled into space appear from our vantage point as if we are looking down a helix. The
remnant central stellar core, destined to become a white dwarf star, gl |
|
s*****t
发帖数: 1994 | 21 Dumbbell Nebula Halo
Credit & Copyright: Robert Gendler
Explanation: In 1764, French astronomer Charles Messier sighted this gorgeous cosmic
cloud which he described as an oval nebula without stars. Cataloged as M27, it is now
popularly known as the Dumbbell Nebula, not for its substandard academic performance but
for the elongated shape, like a bar with weights on each end, which first caught Messier's eye.
This deep image of the bright planetary nebula does reveal the Dumbel |
|
s*****t
发帖数: 1994 | 22 The Cat's Eye Nebula from Hubble
Credit: NASA, ESA, HEIC, and The Hubble Heritage Team (STScI/AURA)
Explanation: Staring across interstellar space, the alluring Cat's Eye
nebula lies three thousand light-years from Earth. A classic planetary
nebula, the Cat's Eye (NGC 6543) represents a final, brief yet glorious
phase in the life of a sun-like star. This nebula's dying central star may
have produced the simple, outer pattern of dusty concentric shells by
shrugging off outer layers in a series of |
|
s*****t
发帖数: 1994 | 23 Henize 3-401: An Elongated Planetary Nebula
Explanation: How do dying stars eject their outer layers? Stars that create elegant planetary
nebulas like Henize 3-401, pictured above, are not unusual, causing speculation that, one day,
our own Sun may look like this. Henize 3-401 is one of the most elongated planetary nebulas
yet discovered, a particularly odd feat for a seemingly round star. Perhaps, some astronomers
hypothesize, the elongated shape gives a clue to the expulsion mechanism. Genesis |
|
s*****t
发帖数: 1994 | 24 Cold Wind from the Boomerang Nebula
Credit: R. Sahai and J. Trauger (JPL), NASA/ESA
Explanation: A cold wind blows from the central star of the Boomerang Nebula. Seen here
in a detailed false-color image recorded in 1998 by the Hubble Space Telescope, the nebula
lies about 5,000 light-years away towards the grand southern constellation of Centaurus. The
symmetric cloud appears to have been created by a high-speed wind of gas and dust blowing
from an aging central star at speeds of |
|
s*****t
发帖数: 1994 | 25 A Tale of Two Nebulae
Credit & Copyright: Brian Lula
Explanation: This colorful telescopic view towards the northern constellation Lyra reveals
dim outer regions around M57, popularly known as the Ring Nebula. While modern
astronomers still refer to M57 as a planetary nebula, at one light-year across M57 is not a
planet but the gaseous shroud of a dying sun-like star. Roughly the same apparent size as M57,
the fainter, often overlooked barred spiral galaxy IC1296 is at the l |
|
s*****t
发帖数: 1994 | 26 Dust and the Helix Nebula
Credit: NASA, JPL-Caltech, Kate Su (Steward Obs, U. Arizona) et al.
Explanation: Dust makes this cosmic eye look red. The eerie Spitzer Space
Telescope image shows infrared radiation from the well-studied Helix Nebula
(NGC 7293) a mere 700 light-years away in the constellation Aquarius. The
two light-year diameter shroud of dust and gas around a central white dwarf
has long been considered an excellent example of a planetary nebula,
representing the final stages in the |
|
|
|
s*****t
发帖数: 1994 | 29 Henize 3-401: An Elongated Planetary Nebula
Explanation: How do dying stars eject their outer layers? Stars that create elegant planetary
nebulas like Henize 3-401, pictured above, are not unusual, causing speculation that, one day,
our own Sun may look like this. Henize 3-401 is one of the most elongated planetary nebulas
yet discovered, a particularly odd feat for a seemingly round star. Perhaps, some astronomers
hypothesize, the elongated shape gives a clue to the expulsion mechanism. Genesis |
|
s*****t
发帖数: 1994 | 30 Cold Wind from the Boomerang Nebula
Credit: R. Sahai and J. Trauger (JPL), NASA/ESA
Explanation: A cold wind blows from the central star of the Boomerang Nebula. Seen here
in a detailed false-color image recorded in 1998 by the Hubble Space Telescope, the nebula
lies about 5,000 light-years away towards the grand southern constellation of Centaurus. The
symmetric cloud appears to have been created by a high-speed wind of gas and dust blowing
from an aging central star at speeds of |
|
s*****t
发帖数: 1994 | 31 A Tale of Two Nebulae
Credit & Copyright: Brian Lula
Explanation: This colorful telescopic view towards the northern constellation Lyra reveals
dim outer regions around M57, popularly known as the Ring Nebula. While modern
astronomers still refer to M57 as a planetary nebula, at one light-year across M57 is not a
planet but the gaseous shroud of a dying sun-like star. Roughly the same apparent size as M57,
the fainter, often overlooked barred spiral galaxy IC1296 is at the l |
|
s*****t
发帖数: 1994 | 32 Dust and the Helix Nebula
Credit: NASA, JPL-Caltech, Kate Su (Steward Obs, U. Arizona) et al.
Explanation: Dust makes this cosmic eye look red. The eerie Spitzer Space
Telescope image shows infrared radiation from the well-studied Helix Nebula
(NGC 7293) a mere 700 light-years away in the constellation Aquarius. The
two light-year diameter shroud of dust and gas around a central white dwarf
has long been considered an excellent example of a planetary nebula,
representing the final stages in the |
|
s*****t
发帖数: 1994 | 33 The Crab Nebula from VLT
Explanation: The Crab Nebula, filled with mysterious filaments, is the result of a star that
was seen to explode in 1054 AD. This spectacular supernova explosion was recorded by
Chinese and (quite probably) Anasazi Indian astronomers. The filaments are mysterious
because they appear to have less mass than expelled in the original supernova and higher
speed than expected from a free explosion. In the above picture taken recently from a Very
Large Telescope, the color indi |
|
s*****t
发帖数: 1994 | 34 The Crab Nebula Pulsar Shrugs
Credit: J. Hester (ASU), CXC, HST, NRAO, NSF, NASA
Explanation: How does a city-sized neutron star power the vast Crab Nebula? The
expulsion of wisps of hot gas at high speeds appears to be at least part of the answer.
Yesterday time-lapse movies taken from both the Chandra X-ray Observatory and the
Hubble Space Telescope were released showing a wisp of gas moving out at about half the
speed of light. Wisps like this likely result from tremendous electri |
|
j*c
发帖数: 97 | 35 Date: Mon, 21 Oct 2002 22:21:20 -0600
From: Jack Schmidling
Newsgroups: alt.binaries.pictures.astro, alt.astronomy, sci.astro,
sci.astro.amateur, sci.astro.ccd-imaging
Subject: PHOTO OF THE WEEK, Basket Weave Nebula
This week we wind up our tour of the Veil nebula with what is probably one
the strangest collections of gas in the Galaxy.
We have also added a new web page which provides the complete tour in one
place.
js |
|
s*****t
发帖数: 1994 | 36 The Crab Nebula from VLT
Explanation: The Crab Nebula, filled with mysterious filaments, is the result of a star that
was seen to explode in 1054 AD. This spectacular supernova explosion was recorded by
Chinese and (quite probably) Anasazi Indian astronomers. The filaments are mysterious
because they appear to have less mass than expelled in the original supernova and higher
speed than expected from a free explosion. In the above picture taken recently from a Very
Large Telescope, the color indi |
|
s*****t
发帖数: 1994 | 37 The Crab Nebula Pulsar Shrugs
Credit: J. Hester (ASU), CXC, HST, NRAO, NSF, NASA
Explanation: How does a city-sized neutron star power the vast Crab Nebula? The
expulsion of wisps of hot gas at high speeds appears to be at least part of the answer.
Yesterday time-lapse movies taken from both the Chandra X-ray Observatory and the
Hubble Space Telescope were released showing a wisp of gas moving out at about half the
speed of light. Wisps like this likely result from tremendous electri |
|
j*c
发帖数: 97 | 38 Date: Mon, 21 Oct 2002 22:21:20 -0600
From: Jack Schmidling
Newsgroups: alt.binaries.pictures.astro, alt.astronomy, sci.astro,
sci.astro.amateur, sci.astro.ccd-imaging
Subject: PHOTO OF THE WEEK, Basket Weave Nebula
This week we wind up our tour of the Veil nebula with what is probably one
the strangest collections of gas in the Galaxy.
We have also added a new web page which provides the complete tour in one
place.
js |
|
o*******d
发帖数: 989 | 39 一个新的星云，天文学家们还没发现，被我先发现了，估算了一下，当时距我大约5X10
(-15)光年，我把它命名为"ontheroad nebula"......☺
1
2
3
谢谢浏览~~ |
|
s*****n
发帖数: 430 | 40 我荒废了许多年没正经读书，张嘴只会胡柴。
所以趁现在轻闲些翻翻图书馆。
Nebula Awards
SFWA's choice for the best Science Fiction and Fantasy of the year
每年出一本，睡觉前翻一翻，还不错。 |
|
d***e
发帖数: 66 | 41
不过连结贴的是 nebula 的
==
我今年猜雨果长篇又杠龟了嘎...... |
|
h*********n
发帖数: 11319 | 42 【 以下文字转载自 Joke 讨论区 】
发信人: nwu (FTO), 信区: Joke
标 题: 术贴 horsehead nebula
发信站: BBS 未名空间站 (Thu Feb 5 16:29:27 2015, 美东) |
|
h*******2
发帖数: 5093 | 43 【 以下文字转载自 Military 讨论区 】
发信人: jjjstc (昵称不能为空), 信区: Military
标 题: 【2016年终总结】天文摄影第四年 (转载)
发信站: BBS 未名空间站 (Sat Dec 17 12:54:12 2016, 美东)
发信人: jjjstc (昵称不能为空), 信区: PhotoGear
标 题: 【2016年终总结】天文摄影第四年
发信站: BBS 未名空间站 (Sun Dec 11 23:59:16 2016, 美东)
去年冬天的雨季一直持续到今年五月才停止，所以到六月才开始今年的拍摄，每个月拍
的照片都在版上贴过，只有12月的是最新的。今年拍的数量比较少，都是一晚才拍一张
，有的照片曝光不止一晚，毕竟曝光时间越长信噪比越高，所呈现的细节也越多
六月
M101 风车星系
七月
M16 鹰状星云，中心是恒星诞生区“创生之柱”
八月
M8 & M20 礁湖星云和三叶星云，位于银河系核心，跟上面M16很靠近
East Veil nebula 超新星遗迹的一部分
九月
NGC6888 Crescent nebula 新月星云
Helix... 阅读全帖 |
|
j****c
发帖数: 19908 | 44 【 以下文字转载自 PhotoGear 讨论区 】
发信人: jjjstc (昵称不能为空), 信区: PhotoGear
标 题: 【2016年终总结】天文摄影第四年
发信站: BBS 未名空间站 (Sun Dec 11 23:59:16 2016, 美东)
去年冬天的雨季一直持续到今年五月才停止，所以到六月才开始今年的拍摄，每个月拍
的照片都在版上贴过，只有12月的是最新的。今年拍的数量比较少，都是一晚才拍一张
，有的照片曝光不止一晚，毕竟曝光时间越长信噪比越高，所呈现的细节也越多
六月
M101 风车星系
七月
M16 鹰状星云，中心是恒星诞生区“创生之柱”
八月
M8 & M20 礁湖星云和三叶星云，位于银河系核心，跟上面M16很靠近
East Veil nebula 超新星遗迹的一部分
九月
NGC6888 Crescent nebula 新月星云
Helix nebula 上帝之眼 三个夜晚曝光
十月
Iris nebula 鸢尾花星云
Bubble nebula 气泡星云
十二月
M1 Crab nebula 蟹状星云，公元1054年爆发的超新星，白天可见，宋史有记录
... 阅读全帖 |
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f******o
发帖数: 2469 | 45 中国怕啥 是美国怕好不好
The Silly Reason the Chinese Aren't Allowed on the Space Station
Welcome home: Nie Haisheng is helped out of his Shenzhou 10 spacecraft
after a 15-day mission in 2013.
Welcome home: Nie Haisheng is helped out of his Shenzhou 10 spacecraft after
a 15-day mission in 2013. AFP/Getty Images
BY JEFFREY KLUGER
MAY 29, 2015
IDEAS
Kluger is Editor at Large for TIME.
Geopolitics can be child’s play—literally. How else would you describe the
did-not! did-too! brawl that can result when one co... 阅读全帖 |
|
j****c
发帖数: 19908 | 46 去年冬天的雨季一直持续到今年五月才停止，所以到六月才开始今年的拍摄，每个月拍
的照片都在版上贴过，只有12月的是最新的。今年拍的数量比较少，都是一晚才拍一张
，有的照片曝光不止一晚，毕竟曝光时间越长信噪比越高，所呈现的细节也越多
六月
M101 风车星系
七月
M16 鹰状星云，中心是恒星诞生区“创生之柱”
八月
M8 & M20 礁湖星云和三叶星云，位于银河系核心，跟上面M16很靠近
East Veil nebula 超新星遗迹的一部分
九月
NGC6888 Crescent nebula 新月星云
Helix nebula 上帝之眼 三个夜晚曝光
十月
Iris nebula 鸢尾花星云
Bubble nebula 气泡星云
十二月
M1 Crab nebula 蟹状星云，公元1054年爆发的超新星，白天可见，宋史有记录
包含RGB和Ha以及O3发射线的M1
只包含Ha以及O3发射线的M1
往年照片请看网站 www.jjjastronomy.com |
|
b*s
发帖数: 82482 | 47 Benford是物理教授，刚刚看了看他的网页：
http://www.physics.uci.edu/faculty/benford.html
然后看看他的书单，居然不是全职作家，高产！
Alternate histories
* Alternate Empires (1989) (with Martin H. Greenberg)
* Alternate Heroes (1989)
* Alternate Wars (1991)
* Alternate Americas (1992) (with Martin H. Greenberg)
[edit] Non-fiction
* Habitats in Space (1998)
* Deep Time: How Humanity Communicates Across Millennia (1999)
* Skylife: Visions of Our Homes in Space (2000, with George Zebrowsk)
* Skylife: Space... 阅读全帖 |
|
s*****t
发帖数: 1994 | 48 A Beautiful Trifid
Credit & Copyright: Jim and Janet Castano, Adam Block, NOAO, AURA, NSF
Explanation: The beautiful Trifid Nebula (aka M20), a photogenic study in cosmic contrasts,
lies about 5,000 light-years away toward the nebula rich constellation Sagittarius. A star
forming region in the plane of our galaxy, the Trifid alone illustrates three basic types of
astronomical nebulae; red emission nebulae dominated by light from hydrogen atoms, blue
reflection nebulae produced by dust reflec |
|
s*****t
发帖数: 1994 | 49 Our Galaxy in Stars, Gas, and Dust
Credit & Copyright: John P. Gleason, Steve Mandel
Explanation: The disk of our Milky Way Galaxy is home to hot nebulae, cold dust, and billions of stars. The red
nebulae visible in the above contrast-enhanced picture are primarily emission nebulae, glowing clouds of
hydrogen gas heated by nearby, bright, young stars. The blue nebulae are primarily reflection nebulae, clouds of
gas and fine dust reflecting the light of nearby bright stars. Pe |
|
s*****t
发帖数: 1994 | 50 A Beautiful Trifid
Credit & Copyright: Jim and Janet Castano, Adam Block, NOAO, AURA, NSF
Explanation: The beautiful Trifid Nebula (aka M20), a photogenic study in cosmic contrasts,
lies about 5,000 light-years away toward the nebula rich constellation Sagittarius. A star
forming region in the plane of our galaxy, the Trifid alone illustrates three basic types of
astronomical nebulae; red emission nebulae dominated by light from hydrogen atoms, blue
reflection nebulae produced by dust reflec |
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