M31：仙女大星系

  影像提供:  Subaru[1] (NAOJ[2]), Hubble[3] (NASA[4]/ESA[5]), Mayall[6] (NSF[7]); 

  Processing & Copyright:  R. Gendler[8] & R. Croman[9]  

  说明:  人类肉眼能轻易见到的最远天体是,M31[10] (仙女大星系[11])，离我们有2百多万光年[12]远。 不过，如果没借助于望远镜，这个跨幅超过[13]200,000 光年[14]的庞大螺旋星系[15]，看起来只是仙女座的一团不起眼的暗淡弥漫云气。 在这幅集成了轨道哈伯[16]及地面昴宿[17]及梅奥望远镜[18]影像数据的精采影像[19]里，仙女大星系明亮的泛黄星系核、蜿蜒黝黑的尘埃带[20]、明亮的宽广泛蓝[21]螺旋臂、与泛红的发射星云[22]皆历历在目。 再过约50亿年，仙女大星系[23]或许会更加容易观测[24]，因为在它与我们银河系合并[25]或穿过[26]银河系之前，它会占满整个夜空。 

   Teachers & Students:  Ideas for using APOD in the classroom[27] 

  明日的图片: open space[28] 

  Authors & editors:  Robert Nemiroff[29] (MTU[30]) & Jerry Bonnell[31] (UMCP[32])

 NASA Official:  Amber Straughn Specific rights apply[33].

 NASA Web Privacy[34], Accessibility[35], Notices[36]; 

 A service of: ASD[37] at NASA[38] / GSFC[39], 

 NASA Science Activation[40] 

& Michigan Tech. U.[41]

 翻译：苏汉宗 Su, Han-Tzong[42] （成功大学[43] 物理学系[44]

[1]https://www.naoj.org/en/about/

[2]http://www.naoj.org/

[3]http://hla.stsci.edu/hla_welcome.html

[4]https://www.nasa.gov/

[5]https://www.esa.int

[6]https://noirlab.edu/public/programs/kitt-peak-national-observatory/nicholas-mayall-4m-telescope/

[7]https://www.nsf.gov/

[8]http://robgendlerastropics.com/Biography2.html

[9]https://www.rc-astro.com/about.html

[10]https://en.wikipedia.org/wiki/Andromeda_Galaxy

[11]https://science.nasa.gov/mission/hubble/science/explore-the-night-sky/hubble-messier-catalog/messier-31/

[12]https://spaceplace.nasa.gov/light-year/en/

[13]http://apod.nasa.gov/apod/ap061228.html

[14]https://spaceplace.nasa.gov/light-year/en/

[15]http://www.hawastsoc.org/deepsky/and/index.html

[16]https://science.nasa.gov/mission/hubble/overview/about-hubble/

[17]https://subarutelescope.org/en/

[18]https://noirlab.edu/public/programs/kitt-peak-national-observatory/nicholas-mayall-4m-telescope/

[19]http://www.robgendlerastropics.com/M31-HST-Subaru-NOAO-RC.html

[20]http://apod.nasa.gov/apod/ap220117.html

[21]http://apod.nasa.gov/apod/ap211124.html

[22]http://apod.nasa.gov/apod/ap210214.html

[23]https://imagine.gsfc.nasa.gov/science/objects/milkyway1.html

[24]https://wallpaperaccess.com/full/621501.jpg

[25]http://apod.nasa.gov/apod/ap220606.html

[26]https://www.science.org/content/article/milky-way-may-escape-fated-collision-andromeda-galaxy

[27]https://apod.nasa.gov/apod/lib/apodclass.html

[28]http://apod.nasa.gov/apod/ap240909.html

[29]http://www.phy.mtu.edu/faculty/Nemiroff.html

[30]http://www.phy.mtu.edu/

[31]https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html

[32]http://www.astro.umd.edu/

[33]http://apod.nasa.gov/apod/lib/about_apod.html#srapply

[34]https://www.nasa.gov/about/highlights/HP_Privacy.html

[35]https://www.nasa.gov/general/accessibility/

[36]https://www.nasa.gov/privacy/

[37]https://astrophysics.gsfc.nasa.gov/

[38]https://www.nasa.gov/

[39]https://www.nasa.gov/centers/goddard/

[40]https://science.nasa.gov/learners

[41]http://www.mtu.edu/

[42]mailto: hantzong.su @at gmail dot com（去掉at及空格並把dot換成

[43]https://www.ncku.ed7u.tw/

[44]https://www.phys.ncku.edu.tw/

http://apod.nasa.gov/apod/ap240908.html

http://sprite.phys.ncku.edu.tw/astrolab/mirrors/apod/ap240908.html