NGC 7331, also known as Caldwell 30, is an unbarred spiral galaxy about 40 million light-years (12 Mpc) away in the constellation Pegasus. It was discovered by William Herschel on 6 September 1784. [4] The galaxy appears similar in size and structure to the Milky Way, and is sometimes referred to as "the Milky Way's twin". [5]

NGC 7331，即科德韦尔30（Caldwell 30），是距离地球约40 × 10 6 光年（12百万秒差距）的无棒螺旋星系，在天球上位于飞马座。 该星系于1784年被 威廉·赫歇尔 发现 [ 3 ] 。

NGC 7331，即科德韦尔30（Caldwell 30），是距离地球约40 × 106 光年 （12 百万秒差距）的 无棒螺旋星系，在天球上位于 飞马座。 该星系于1784年被 威廉·赫歇尔 发现。 NGC 7331是NGC 7331星系群中最明亮的 成员星系。 与NGC 7331同一视线方向星系有透镜状或无棒螺旋星系NGC 7335与 7336、 棒旋星系 NGC 7337和 椭圆星系 NGC 7340，但这些星系距离地球约3.32、3.65、3.48与2.94亿，与NGC 7331并无直接关联。 在NGC 7331的可见光和近红外影像中。 星系核 …

NGC 7331，即科德韋爾30（Caldwell 30），是距離地球約40 × 10 6 光年（12百萬秒差距）的無棒螺旋星系，在天球上位於飛馬座。 該星系於1784年被 威廉·赫歇爾 發現 [ 3 ] 。

NGC 7331 Group is a visual grouping of galaxies in the constellation Pegasus. Spiral galaxy NGC 7331 is a foreground galaxy in the same field as the collection, which is also called the Deer Lick Group. [1]

NGC 7331群是在飛馬座中一個可以透過光學望遠鏡觀測的星系群。螺旋星系 NGC 7331是與這個群在同一方向上的前景星系，也稱為Deer Lick Group [1] ，它擁有四個成員，被暱稱為"跳蚤"：透鏡或無棒螺旋星系NGC 7335和7336、棒旋星系NGC 7337和橢圓星系NGC 7340。

2023年10月28日 · NGC 7331 is an unbarred spiral galaxy located 39.8 million light-years away in the constellation Pegasus. With an apparent magnitude of 10.4, it can be seen in small telescopes. It is the brightest galaxy in the NGC 7331 Group, a visual grouping that also includes four more distant galaxies.

2018年2月2日 · This NASA/ESA Hubble Space Telescope image shows a spiral galaxy known as NGC 7331. First spotted by the prolific galaxy hunter William Herschel in 1784, NGC 7331 is located about 45 million light-years away in the constellation of Pegasus (the Winged Horse).

About 50 million light-years distant in the northern constellation Pegasus, NGC 7331 was recognized early on as a spiral nebula and is actually one of the brighter galaxies not included in Charles Messier's famous 18th century catalog.

2024年8月23日 · The majestic spiral galaxy Caldwell 30, also cataloged as NGC 7331, is often touted as an analog to our own Milky Way, as its size, shape, and mass are similar to our galaxy’s. Caldwell 30’s starry disk is inclined to our line of sight, so long telescopic exposures often result in images that evoke a strong sense of depth.