世界各地有許多創造天地的神話圍繞著銀河系發展出來。很特別的是，在希臘就有兩個相似的希臘神話故事在解釋銀河是怎麼來的。有些神話將銀河和星座結合在一起，認為成群牛隻的乳液將深藍色的天空染白了。在東亞，人們相信在天空中群星間的霧狀帶是銀色的河流，也就是所謂天河。
依據希臘神話，銀河是赫拉在發現宙斯以欺騙的手法誘使他去餵食年幼的赫拉克勒斯因而濺灑在天空中的奶汁。另一種說法則是赫耳墨斯偷偷地將赫拉克勒斯帶去奧林匹斯山，趁著赫拉沉睡時偷吸她的奶汁，而有一些奶汁被射入天空，於是形成了銀河。
Two spiral arms, the Scutum–Centaurus arm along with the Carina–Sagittarius arm, have tangent points inside the Solar's orbit about the center in the Milky Way. If these arms contain an overdensity of stars as compared to the normal density of stars inside the Galactic disk, it would be detectable by counting The celebs near the tangent issue.
Our own photo voltaic technique, consequently, really should be somewhat Safe and sound mainly because of the very low threat of star collision. Having said that, we could obtain ourselves thrown into a completely unique path within the new galactic Centre because the merger pushes through.
All of that is definitely surrounded by a spherical halo of dust and gasoline, which can be two times as broad given that the disk. Astronomers think that the complete galaxy is embedded in an even much larger halo of invisible dark issue.
Want to check how mild-polluted the sky with your town is? Head to our infographic and find out how light-weight pollution influences That which you see!
There are numerous solutions being used in astronomy in defining the scale of the galaxy, and each of these can generate unique effects with regard to each other. The mostly employed technique may be the D25 regular – the isophote wherever the photometric brightness of a galaxy inside the B-band (445 nm wavelength of light, inside the blue part of the obvious spectrum) reaches twenty five mag/arcsec2.[121] An estimate from 1997 by Goodwin and Other folks when compared the distribution of Cepheid variable stars in seventeen other spiral galaxies to the ones in the Milky Way, and modelling the relationship to their surface brightnesses.
Among the most placing capabilities you can see in A very dim sky—one without light pollution—is the band of faint white mild known as the Milky Way, which stretches from one particular horizon to one other. The name arises from an historic Greek legend that compared its faint white splash of sunshine to a stream of spilled milk.
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It might look tiny from our viewpoint, nonetheless it’s an enormous, sprawling entity that makes our photo voltaic program seem like a speck of dust. Let’s take a better check out just mawinbet how major the Milky Way seriously is.
In the event the Milky Way contained just the mass observed in stars, fuel, together with other baryonic (common) make a difference, the rotational velocity would reduce with length from the center. However, the noticed curve is pretty flat, indicating that there's added mass that can't be detected immediately with electromagnetic radiation.
While stars could dominate our perspective, they make up only a portion of your Milky Way’s mass. A vast, unseen part called darkish make a difference envelopes the galaxy, extending well further than the noticeable disk.
A diagram on the Solar's location inside the Milky Way; the angles depict longitudes during the galactic coordinate method A galactic quadrant, or quadrant in the Milky Way, refers to 1 of 4 circular sectors while in the division of the Milky Way.
On one particular side of The talk, Shapley thought the Milky Way was much bigger than preceding estimates and that we were not at the center. He also claimed that "spiral nebulae" for instance Andromeda have been a part of the Milky Way.