NGC 4449, also known as Caldwell 21, is an irregular Magellanic type galaxy in the constellation Canes Venatici, being located about 13 million light-years away. [3] It is part of the M94 Group or Canes Venatici I Group that is relatively close to the Local Group hosting our Milky Way galaxy.

哈伯太空望遠鏡 (HST)的NGC 4449影像。 NGC 4449，也稱為 科德韋爾21，是位於 獵犬座 的一個不規則星系，距離大球大約1,200萬光年，屬於 M94星系團 (獵犬座星系群) 的一部分。 這是相對來說相當靠近 本星系群，我們 銀河系 系所屬的星系群，的一個 星系群。 由於和 大麥哲倫星系 (LMC) 的大小非常相似，因此被仔細的研究和拿來做為比較。 NGC 4449有一般的棒型，也有LMC的特徵，散布著藍色的恆星和星團。 靠近底部 (哈伯的照片) 是氫原子氣體發出的粉紅色 …

NGC 4449 is a Irregular Galaxy in the Canes Venatici constellation. NGC 4449 is situated north of the celestial equator and, as such, it is more easily visible from the northern hemisphere. Given its visual magnitude of 9.64, NGC 4449 is visible with the help of a binocular with a 80mm aperture or a small telescope.

2024年8月23日 · Caldwell 21, also known as NGC 4449, is an irregular dwarf galaxy located over 10 million light-years from Earth. This star-speckled Hubble image captures the chaotic, ongoing processes of stellar evolution within the galaxy.

2024年5月30日 · The James Webb Space Telescope observed “starburst” galaxy NGC 4449, seen in this image released on May 29, 2024. Starbursts are intense periods of star formation usually concentrated at a galaxy’s core, but NGC 4449’s activity is much more widespread — likely due to past interactions with its galactic neighbors.

2007年7月3日 · A "global" starburst like NGC 4449 resembles primordial star forming galaxies, which grew by merging with and accreting smaller stellar systems. Since NGC 4449 is close enough to be observed in great detail, it is the ideal laboratory for the investigation of what may have occurred during galactic formation and evolution in the early universe.

2007年7月3日 · Nearly 12.5 million light-years away in the dwarf galaxy NGC 4449 a veritable stellar "fireworks" is on display - here shown in exquisite detail through the eyes of the Hubble Space Telescope. Hundreds of thousands of vibrant blue and red stars are visible in this new image of galaxy NGC 4449 taken by the NASA/ESA Hubble Space Telescope.

2017年7月14日 · Less than 20,000 light-years across, the small island universe is similar in size, and often compared to our Milky Way's satellite galaxy, the Large Magellanic Cloud (LMC). This remarkable Hubble Space Telescope close-up of the well-studied galaxy was reprocessed to highlight the telltale reddish glow of hydrogen gas.

NGC 4449，也称为科德韦尔21，是位于 猎犬座 的一个 不规则星系，距离大球大约1,200万光年，属于 M94星系团 (猎犬座 星系群) 的一部分。 是相对来说相当靠近 本星系群，我们 银河系 系所属的星系群，的一个 星系群。 由于和 大麦哲伦星系 (LMC) 的大小非常相似，因此被仔细的研究和拿来做为比较。 NGC 4449有一般的棒型，也有LMC的特征，散布着蓝色的恒星和 星团。 靠近底部 (来自 哈勃太空望远镜 的照片) 是氢原子气体发出的粉红色光，这是大质量恒星形成区的泄 …

But small irregular galaxies form stars too, like NGC 4449, located about 12 million light-years away. In fact, this sharp Hubble Space Telescope close-up of the well-studied galaxy clearly demonstrates that reddish star forming regions and young blue star clusters are widespread .