本帖最后由 gohomeman1 于 2009-12-19 15:08 编辑
14 September 2009: A Cosmic Embrace
2009.9.14:一个宇宙拥抱
In this image, two spiral galaxies, similar in looks to the Milky Way, are participating in a cosmic ballet, which, in a few billion years, will end up in a complete galactic merger — the two galaxies will become a single, bigger one.
图中, 两个类似我们银河系的涡旋星系,正在跳一场宇宙芭蕾。十几亿年后,它们将终结于完整的星系合并——两个星系将合并为更大的一个星系。
Located about 150 million light-years away in the constellation of Canis Major (the Great Dog), NGC 2207 — the larger of the two — and its companion, IC 2163, form a magnificent pair. English astronomer John Herschel discovered them in 1835.
位于大犬星座、离我们1.5亿光年的这2个星系——较大的NGC 2207和其伴星系IC 2163构成了壮丽的一对。它们由英国天文学家约翰.赫歇耳于1835年发现。
The fatal gravitational attraction of NGC 2207 is already wreaking havoc throughout its smaller partner, distorting IC 2163’s shape and flinging out stars and gas into long streamers that extend over 100,000 light-years. The space between the individual stars in a galaxy is sovast, however, that when these galaxies collide, virtually none of the stars in them will actually physically smash into each other.
NGC 2207对其小伙伴 IC2163S施加的强大万有引力,扭曲了其外形,并拉出长达10万光年的由恒星、气体组成的潮汐尾。不过,恒星的间距实在大,既使两个星系相撞,几乎不会有恒星真正的互相撞在一起。
This image was captured with the ESO Faint Object Spectrograph and Camera (EFOSC2) through three wide band filters (B, V, R). EFOSC2 has a 4.1 x 4.1 arcminute field of view and is attached to the 3.6-metre telescope at ESO’s La Silla Observatory in Chile.
本图由位于智利的ESO的拉斯拉天文台的3.6米望远镜拍摄,拍摄仪器为ESO的暗天体照相机和摄谱仪(EFOSC2),使用了红、绿、蓝3个滤光器。EFOSC2的视场大小为4.1 x 4.1角秒。
This image is available in high-resolution in the image archive.
本图的高清晰版本见下楼。 |