银河系
Sb、Sbc、 | |
100—180 kly(31—55 kpc)[3] | |
≈2 kly(0.6 kpc)[4][5] | |
1000–4000 | |
≥13.7 Gyr[9] | |
0.8–1.5×1012 M☉[10][11][12] | |
≈×1067 J s 1[13] | |
27.2 ± 1.1 kly(8.34 ± 0.34 kpc)[14] | |
240 Myr[15] | |
旋臂 | 220–360 Myr[16] |
100–120 Myr[16] | |
552 ± 6 km/s[17] | |
550 km/s[12] | |
0.0088+0.0024 -0.0018 M☉pc-3 -0.07 GeV cm-3[12] | |
外觀
[编辑]大 小和 質量
[编辑]估計
容量
[编辑]結構
[编辑]銀河 象限
[编辑]第 一 銀河 象限 : 0° ≤經度 (ℓ) ≤ 90°[81]第 二 銀河 象限 : 90° ≤ ℓ ≤ 180°[79]第 三 銀河 象限 : 180° ≤ ℓ ≤ 270°[80]第 四 銀河 象限 : 270° ≤ ℓ ≤ 360° (0°)[78]
銀 心
[编辑]螺旋 臂
[编辑]銀 暈
[编辑]太陽 的 位置 和 近 邻
[编辑]銀河系 自轉 及銀河 年
[编辑]年齡
[编辑]銀河系 的 鄰居
[编辑]穿 過 空間 的 速度
[编辑]对银河 系 的 探索
[编辑]虽然从非
1750
1918
神話
[编辑]Akashaganga
銀河 的 未來
[编辑]参 见
[编辑]註解
[编辑]- ^ 另見
波 特 尔暗空 分 类法。 - ^
銀河 的 中心 位 於人馬 座 的 方向 上 。從 人馬 座 ,朦朦 朧 朧 的 白色 光 帶 似 乎向西 通過 天 蠍 座 、天壇 座 、矩尺 座 、南 三角 座 、圓 規 座 、半 人馬 座 、蒼 蠅 座 、南 十 字 座 、船底 座 、船 帆 座 、船尾 座 、大 犬 座 、麒麟 座 、獵 戶 座 、雙子 座 、金 牛 座 ,到 在 御 夫 座 的 反 銀 心 。從 那 兒 再 經過 英 仙 座 、仙女 座 、仙 后 座 、仙 王座 、蝎虎座 、天 鵝座、狐狸 座 、天 箭 座 、天 鷹 座 、盾 牌 座 ,返 回 到 人馬 座 。 - ^ Karachentsev et al. give a blue absolute magnitude of −20.8. Combined with a color index of 0.55 estimated here, an absolute visual magnitude of −21.35 (−20.8 − 0.55 = −21.35) is obtained. Note that determining the absolute magnitude of the Milky Way is very difficult, because Earth is inside it.
- ^ For a photo see: Sagittarius A*: Milky Way monster stars in cosmic reality show. Chandra X-ray Observatory. Harvard-Smithsonian Center for Astrophysics. 2003-01-06 [2012-05-20]. (
原始 内容 存 档于2008-03-17). - ^
運動 的 速度 總 是 需要 與 另一個物體比較才能量度
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据 西 晋 张华《博物 志 》的 记载:“旧 说云天 河 与 海 通 。近世 有人 居 海 渚 者 ,年年 八 月 有 浮槎,去来 不 失 期 。人 有 奇 志 ,立 飞阁于槎上 ,多 赍粮,乘 槎而去。十 余 日 中 ,犹观星 月日 辰 ,自 后 茫茫 忽 忽 ,亦 不 觉昼夜 。去 十 余 日 ,奄至一 处,有 城廓 状 ,屋舍 甚严,遥 望 宫中多 织妇。见一丈夫 ,牵牛渚 次 饮之。牵牛人 乃惊问曰:‘何 由 至 此?’此人具 说来意 ,并问此是何 处。答 曰:‘君 还至蜀 郡 访严君平 ,则知之 。’竟不上岸 ,因 还如期 。后 至 蜀 问君平 ,君平 曰:‘某 年月日 ,有 客 星 犯 牵牛宿 。’计年月 ,正 是 此人到 天 河 时也。” - ^ Dave Finley. Massive Gas Cloud Speeding Toward Collision With Milky Way. NRAO. [2008-01-14]. (
原始 内容 存 档于2008-01-15).
延伸 阅读
[编辑][
- Thorsten Dambeck in Sky and Telescope, "Gaia's Mission to the Milky Way", March 2008, p. 36–39.
- Cristina Chiappini, The Formation and Evolution of the Milky Way, American Scientist, November/December 2001, pp. 506–515(页面
存 档备份,存 于互联网档案 馆)
外部 連結
[编辑]- Milky Way – 3D
圖 (页面存 档备份,存 于互联网档案 馆) - Milky Way –
基礎 平面 圖 (页面存 档备份,存 于互联网档案 馆) –包括 旋臂和 獵 戶 分 支 - Milky Way – IRAS (
紅 外線 天文 衛星 )巡 天 (页面存 档备份,存 于互联网档案 馆) – wikisky.org - Milky Way – H
α 巡 天 (页面存 档备份,存 于互联网档案 馆) – wikisky.org - Milky Way –
多 波 段 (页面存 档备份,存 于互联网档案 馆) –影像 和 VRML模型 (NASA) - Milky Way –
全景 圖 (90億 畫素 ) (页面存 档备份,存 于互联网档案 馆). - Milky Way –
模擬 旅程 (页面存 档备份,存 于互联网档案 馆),南 威 爾 斯大學 - Milky Way (页面
存 档备份,存 于互联网档案 馆) – SEDS梅 西 爾 網 站 - Milky Way (页面
存 档备份,存 于互联网档案 馆) –紅 外線 影像 - Milky Way Video (02:37) – VISTA IR
望遠鏡 影像 (2012年 10月 24日 ) (页面存 档备份,存 于互联网档案 馆) - Milky Way Video (06:37) –
實 時 (奧 瑞 岡 ;2016年 9月 17日 ) (页面存 档备份,存 于互联网档案 馆) 全 天 圖 – CMB輻射 (普 朗 克 ;一 年 巡 天 )
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