Pretending there's something magical and different about it is why so many people continue to think that dark matter is just scientists making up nonsense to patch over holes in their pet theories. Dark matter is no more invisible or undetectable than an electron or a distant gas cloud. Like almost everything science, especially physics, ever looks at, it has effects on things around it, and we observe those effects and infer what must be causing them. If you do anything other than look directly at something with your bare eyeball, you are inferring things from indirect observations on something else.ĭark matter is not anything weird or special. No-one has ever seen an electron or proton, their presence is entirely inferred from their effects on other things. Except we can't see infrared, its presence can only be inferred from the effect it has on some electronics. If you look at one of the pictures from James Webb, for example, it will almost certainly have been taken in infrared. ![]() Almost all scientific observations are done indirectly. I really dislike this kind of statement, and I think it's responsible for a lot of the nonsense and disbelief that always comes up with dark matter. The conclusion: the stars in each group belonged to another galaxy, which at some point in the past fell into the Milky Way. We have found many groups of stars which appear to share such unusual orbits - some are compact, but others are stretched out to form what look like long "snakes" or "tubes" of stars permeating the Milky Way.įollowup spectroscopy with other telescopes of this stars reveals (in many cases) that they share similar chemical compositions and ages, both of which are not commonly found in Milky Way stars. That allows astronomers to make 3-D maps of the galaxy, star-by-star, and look for bunches of stars with very similar orbits which aren't ordinary. Gaia can measure the 3-D position of hundreds of millions of stars very precisely, and measure some components of their velocities, too. Even if the galaxy is disrupted, most of its stars will continue to follow its original orbit for a very long time. ![]() But if a small galaxy fell into the Milky Way, it would (very likely) come in at some angle to the disk, and with some eccentricity. Synonyms for DEVOURING: gobbling, gorging, gulping, insatiable, wolfish, ravenous, gormandizing, unquenchable Antonyms of DEVOURING: full, content, satisfied. Any stars born in the disk of the Milky Way will have roughly circular orbits, in the same plane, moving in the same direction (clockwise or counterclockwise around the center, depending on which way one counts as "up"). The basic idea is to look for groups of stars which share orbits as they move through the Milky Way.
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