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Originally posted by Sly1one
Anyone else noticing that Sirius seems to be blinking a lot? I'm not implying anything here but rather just trying to see if anyone is noticing this, or if for whatever reason for the last few nights my eyes have constantly honed in on Sirius as "abnormal" to the rest of the stars in the night sky.
Originally posted by Segador
We already had a thread discussing this, it is natural.
Originally posted by metalholic
reply to post by GBP/JPY
ufo's hide amongst the stars pretending to be part of the night sky! where is the best place to hide? right in front of your face!
we are a species that denies things to the very end so any intelligent species will know that another person will come away and explain them away! inside the box thinkers are the governments best friend!!
Originally posted by VirtualParadise
Sirius has always seemed to blink variably, it's an extremely strange star, and you can't view it properly using any space agency image source like NASA or ESA either which makes it even more questionable... for example, on google earth and the microsoft wwt, Sirius has a big yellow/orange 'blob' over it... but why? Someone a while ago said it's because it's too bright for the telescope or something similar, but that doesn't even sound plausible imo with the precise technology they have in their telescopes. Hehe I bet there's at least 1 clearly habitable planet around it or something ;-)
Saw it for a while last night, as it rises through the sky in the UK around midnight onwards atm for a pretty clear view (when there's no chem-trails or cloud coverage - which there's been a lot of both lately except for clear night a few days ago and last night), but just keep your eye on that star as it's definitely very mysterious!
There's also another star to the South West-ish that blinks similar, almost directly opposite Sirius, but in the same observable sky - I'll have to find out what star this is and keep an eye on that too, as the blinking and colour changing of stars like Sirius has always boggled me
If anyone can find some close hi quality pictures of Sirius that would be amazing!! The only ones I can find online are a bit crap lol
Originally posted by Saint Exupery
The blinking & twinkling is caused by the Earth's atmosphere. It is not a property of the star itself. Unstable air refracts the light. This lensing causes causes fluctuation in brightness and (thanks to something called "chromatic abberation") color. The main advantage of the Hubble telescope is not how much it magnifies things - Many telescopes on Earth have higher resolution. Rather it is the fact that, in space, it doesn't have to look through unstable air.
When we look across a hot parking lot, we can see the air shimmering. In fact, the air in every direction is shimmering, but usually the effect is too small to see. Objects who's shape we can resolve (such as the Moon and planets) don't show this rippling unless we look through a telescope. Stars, on the other hand, are so far away that they are effectively point-sources, and thus show the refraction. This is why we tend to notice twinkling more with stars than with planets (Somebody earlier mentioned that Betelguese didn't seem to be twinkling as much as Sirius. This was a good observation. Although Betelgeuse is much further away than Sirius, it is physically so large that its disk is resolvable with large telescopes. Thus it is less vulnerable to refraction than closer stars).
More heat causes more shimmer (literally, more refraction) and thus more dramatic twinkling. Also, the more air the light passes through, the greater the twinkling effect. Thus, when a star is low to the horizon (such as when it's rising or setting, or - like Sirius - is far south when viewed from northern latitudes) it twinkles more dramatically because it is travelling through dozens of miles of thick air.
Hope this helps.