时间:2025-03-01 00:53:00 来源:网络整理编辑:娛樂
We may never leave our Milky Way galaxy and see it from the outside, but the Hubble Space Telescope
We may never leave our Milky Way galaxy and see it from the outside, but the Hubble Space Telescope at least helps us imagine that view.
A newly shared Hubble image that NASA posted on Friday takes a look at NGC 3432. This not-too-distant celestial body (it's only 42 million light-years away!) is a spiral galaxy much like Earth's own Milky Way. But because of where we are and how it's situated, Hubble's photo amounts to a side view.
Tweet may have been deleted
You might be wondering how we even know this is what a spiral galaxy looks like from the side, since we're only able to look at it (and pretty much every other distant thing in outer space) from one angle. NASA, as it turns out, has some experience in the arena of looking at space photos.
"Dark bands of cosmic dust, patches of varying brightness and pink regions of star formation help with making out the true shape of NGC 3432 — but it’s still somewhat of a challenge," NASA's Friday post reads. "Because observatories such as the NASA/ESA Hubble Space Telescope have seen spiral galaxies at every kind of orientation, astronomers can tell when we happen to have caught one from the side."
If you're anything like me, this photo also got you wondering how we could possibly know that the Milky Way is a spiral galaxy. I'm sure it's been addressed elsewhere, but I found an explanation on Cornell's website from former student Sara Slater, who studied physics at Harvard and now works as a researcher at M.I.T.'s Kavli Institute.
Although we don't have a way to actually snap a photo of the Milky Way, Slater points to three clues that out our home galaxy's general shape. First, researchers are able to make out the galaxy's rough shape in silhouette by looking to the galaxy's center. Our view of it is similar to Hubble's edge-on look at NGC 3432, with the Milky Way appearing as a long, thin strip with a bulge at the center.
SEE ALSO:Gorgeous rose-colored Hubble photo is your daily reminder that space is super cool"This is a bit of a tipoff," Slater wrote. She also noted that the measured velocity of stars and gas in our galaxy suggests "an overall rotational motion that differs from random motions," and that's "another characteristic of a spiral galaxy." And finally, the observed gas and dust content of the Milky Way also falls in line with that of other spiral galaxies.
"So, overall, it's a pretty convincing argument," Slater concluded. "Of course, we have to assume our galaxy is not completely unlike the other galaxies we see—once a civilization has accepted that it does not occupy any special place in the Universe, arguments about similarity seem sensible."
Fake news reports from the Newseum are infinitely better than actual news2025-03-01 00:35
英媒:呂迪格大概率離隊 圖赫爾欽點巴黎王牌替他2025-03-01 00:17
西媒撰文評中國足球:金元足球退潮 奧斯卡成唯一大牌2025-03-01 00:09
曝博塔弗戈有意引進艾克森 開年薪遞增合同球員要求雙倍起薪2025-03-01 00:08
Honda's all2025-03-01 00:00
名記 :巴薩已完成費蘭2025-02-28 23:59
曝博塔弗戈有意引進艾克森 開年薪遞增合同球員要求雙倍起薪2025-02-28 23:57
泰山時隔11年再奪中超冠軍 郝偉成隊史首位奪冠土帥2025-02-28 23:55
Darth Vader is back. Why do we still care?2025-02-28 23:39
熱議泰山隊奪冠 :28年持續健康發展 冠軍分量不比過往低2025-02-28 22:27
This company is hiring someone just to drink all day2025-03-01 00:49
巴薩還在靠梅西賺錢!上季簽名球衣 售價高達1170歐2025-03-01 00:47
郝偉:本土教練需要在業務上多鑽研 奪冠歸功於俱樂部整體保障2025-03-01 00:42
魯梅尼格 :尤文負債累累 我若是掌舵人將無法入眠2025-03-01 00:10
Here's what 'Game of Thrones' actors get up to between takes2025-03-01 00:09
西媒撰文評中國足球:金元足球退潮 奧斯卡成唯一大牌2025-02-28 23:47
賽後發布會僅耗時不到1分鍾 李金羽:恭喜滄州保級成功2025-02-28 23:39
大連人主帥:球隊傷病比較嚴重 有信心打好比賽2025-02-28 23:16
5 people Tim Cook calls for advice on running the biggest company in the world2025-02-28 22:53
反骨仔?恰球王:米蘭有優秀球員 但國米陣容更棒2025-02-28 22:28