Kirkjufel Aurora All sky panorama Credit - Roi Levi Location - Iceland Date - March 10 2024 Statistics: Posted by Roi Levi — Fri May 03, 2024 7:56 pm ..read more

I find it interesting that the trailing side is slightly hotter than the leading side. I guess it would require an understanding of how the wind system works. It seems equally likely to me that either edge could be warmer, or that the entire face could be uniform. Statistics: Posted by Chris Peterson — Fri May 03, 2024 5:51 pm ..read more

I find it interesting that the trailing side is slightly hotter than the leading side. That's what I was wondering. If the planet was rocky, I suppose the temp would be similar to it's present state, except that it would take longer to go from sun-side to dark-side? But that is I guess a moot point since both bodies have been there a long time? The other thought tho is perhaps cold space on the dark-side has less effect on a gaseous body constantly getting quick heat osmosis than a rocky body does? Mercury's rotation is so slow, and it's colder side is very cold, possibly having permanent ic ..read more

I find it interesting that the trailing side is slightly hotter than the leading side. Statistics: Posted by Cousin Ricky — Fri May 03, 2024 5:10 pm ..read more

I appreciate NASA is an American agency which is beholden to increasing interest in space for Americans but I would appreciate having the courtesy of having conversions to metric units in brackets after the imperial ones, for the benefit of us international readers. I agree. But I also think in this particular context, kelvins would be most useful for getting a feel for these temperatures. 2,500°F ≅ 1,400°C ≅ 1,600 K (red hot) 1,000°F ≅ 540°C ≅ 810 K (just barely glowing in visible light) Figures are rounded to 2 significant places. Statistics: Posted by Cousin Ricky — Fri May 03, 2024 5:0 ..read more

You'd think at that orbital distance, the parent star would either wick matter from WASP-43b, or cause the orbit to decay until the planet broke apart, or given time, both. I'm no astrophysicist, though..... :' ) The sizes in the diagram are not to scale. 2 million km is large compared to the sizes of the star (~470,000 km) and planet (~74,000 km). Statistics: Posted by Cousin Ricky — Fri May 03, 2024 4:53 pm ..read more

Insanely Detailed Webb Image of the Horsehead Nebula universetoday.com | 2024 April 30 tunnel rush The leading image shows JWST’s view of the Horsehead Nebula alongside two other views. The Euclid image was captured in November 2023. Euclid features a wide-angle, 600-megapixel camera, and its primary job is to measure the redshift of galaxies and the Universe’s expansion due to dark energy. It took Euclid about one hour to capture the image, showcasing the telescope’s ability to gather highly detailed images quickly. The Hubble captured its image in 2013 and was released as the telesco ..read more

Still not much of a definitive bar in M61 at all compared to your other examples. And I'm not convinced of the "inner" bar in NGC 1365 either! "A bar is in the eye of the beholder" it seems. I just told you that I don't necessarily always trust Wikipedia, but now I'm going to quote Wikipedia anyway to back up my claim that there are two bars in NGC 1365: Wikipedia wrote: NGC 1365 is a large barred spiral galaxy in the Fornax cluster. Within the larger long bar stretching across the center of the galaxy appears to be a smaller bar that comprises the core, with an apparent size of a ..read more

Is there even a definition of a "bar" based on something other than mere appearance? Is it simply dust/gas that is apparently concentrated more or less predominantly along a line through the galaxy core? I think it's purely a subjective, visual definition. In a sense, we might argue there is no such thing as a barred or unbarred spiral, merely a continuum between very strong and very weak central resonance structures... states that spiral galaxies appear to oscillate between over billions of years. What's a "central resonance structure"? Well, a bar is the most obvious one! Statistic ..read more

I just told you that I don't necessarily always trust Wikipedia, but now I'm going to quote Wikipedia anyway to back up my claim that there are two bars in NGC 1365: And I can see the bars of NGC 1365. Ann Is there even a definition of a "bar" based on something other than mere appearance? Is it simply dust/gas that is apparently concentrated more or less predominantly along a line through the galaxy core? I think it's purely a subjective, visual definition. In a sense, we might argue there is no such thing as a barred or unbarred spiral, merely a continuum between very strong ..read more