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midtskogenDate: Monday, 08.04.2013, 07:13 | Message # 151
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Looking through some old photos (2007 & 2003)...



Has anyone here been there?

Attachments: 2545127.jpg (100.0 Kb) · 5627174.jpg (123.6 Kb) · 8530678.jpg (101.6 Kb) · 8030868.jpg (40.3 Kb)





NIL DIFFICILE VOLENTI


Edited by midtskogen - Monday, 08.04.2013, 07:24
 
WatsisnameDate: Monday, 08.04.2013, 07:26 | Message # 152
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I've been on the big island of Hawaii once, but I wasn't able to go up to the observatory. Something about rental cars not being allowed on that road. sad




 
midtskogenDate: Monday, 08.04.2013, 08:52 | Message # 153
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Quote (Watsisname)
I've been on the big island of Hawaii once, but I wasn't able to go up to the observatory. Something about rental cars not being allowed on that road.

The road is good, but rules are rules (I would worry more about the car regardless of type if you go all the way up from Saddle road as fast as you can in low gear with no break on the way to let the engine cool).

The first time (2003) I parked the car at the visitor centre at 2800 meters and walked from there (because of the rental terms). It's easy terrain and hard to get lost, but when you were at sea level a few hours before, you'll notice the altitude eventually. So it might be an easy walk to reach Lake Waiau at nearly 4000 meters, and the fatigue might set in while walking the relatively flat last bit to the summit. Judging by the timestamps of my pictures I seem to have used about 4.5 hours from the visitor centre to the summit. I had to take frequent breaks after passing Lake Waiau. I walked the road on my way down, and was quickly offered a lift down by a passing car.

The second time (2007) I was in the big island I went with my family and we had a one year child with us, and I don't think it would be wise to carry him on a trek at that altitude. So we rented a different car in Hilo for one day which could be taken to the summit, drove to the visitor centre and then took turns going to the summit, the other staying behind at the centre with the child.

It would be hard for me if I had gone all the way to Hawaii, come to the visitor centre just a few km from the summit and NOT gone there.

EDIT: The first picture was taken from the flight from Hilo to Osaka. It took the route skimming the flank of Mauna Kea on its way to cruising altitude. A nice unexpected bonus.





NIL DIFFICILE VOLENTI


Edited by midtskogen - Monday, 08.04.2013, 10:03
 
HarbingerDawnDate: Tuesday, 09.04.2013, 16:57 | Message # 154
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An interesting and informative video about the Starfish Prime nuclear test and the science it supported. Starfish was one of the most spectacular tests. It had a yield of 1.45 megatons and was detonated at an altitude of 400 km - the same as the ISS. The test was most famous for creating bright auroral displays and a large electromagnetic pulse. It also created a radiation belt in Earth orbit which disabled 1/3 of all operational satellites at that time.



The first 7 minutes are the informative video. The rest is test imagery.





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HarbingerDawnDate: Thursday, 11.04.2013, 19:34 | Message # 155
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A timelapse of SDO imagery showing one full year on the Sun smile






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midtskogenDate: Thursday, 11.04.2013, 20:23 | Message # 156
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Interesting! And it seems that 2012 may have been the peak of the cycle, and a puny cycle it has been (though polarity seems to switch this year).

It's been a while since I've had a look at this graph, which will be interesting to follow for the next decade:


If the index drops below 1500, most spots will be invisible. Now it looks like the decline has stopped and then we aren't headed for spotless cycles as some predict? Or perhaps it's just an effect of there being no samples for values below that limit.





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HarbingerDawnDate: Saturday, 13.04.2013, 07:10 | Message # 157
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A really cool artwork depicting the surface of an exomoon (or just a regular moon to anyone with any sense, which the IAU seemingly lacks at times).



Image credit: IAU/L. Calçada





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midtskogenDate: Saturday, 13.04.2013, 19:49 | Message # 158
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Halo!

(I think I'll keep my forum avatar as it is until SE includes halos, just as a reminder). My SE hobby horse. biggrin





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HarbingerDawnDate: Tuesday, 16.04.2013, 14:08 | Message # 159
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The Red Rectangle





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HarbingerDawnDate: Wednesday, 17.04.2013, 22:56 | Message # 160
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More than two decades after reunification, differences between East and West Berlin are still apparent from orbit



Paris: pretty from orbit, but I wouldn't want to try stargazing from there






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Edited by HarbingerDawn - Wednesday, 17.04.2013, 23:49
 
anonymousgamerDate: Thursday, 18.04.2013, 00:13 | Message # 161
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Quote (HarbingerDawn)
differences between East and West Berlin are still apparent from orbit


Why the color difference?





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HarbingerDawnDate: Thursday, 18.04.2013, 00:40 | Message # 162
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Why the color difference?

They use different kinds of lights in different parts of the city obviously.





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WatsisnameDate: Thursday, 18.04.2013, 04:35 | Message # 163
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Yup. Sodium lights give that orange/yellow color, and the blue is probably Mercury.

Also that image of the Red Rectangle is amazing, I don't think I've ever seen such a nice shot of it before. smile





 
HarbingerDawnDate: Thursday, 18.04.2013, 23:48 | Message # 164
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What happens when you wring out a soaked washcloth in space? Chris Hadfield has the answer.



Aww, they cut out the fun part of him saturating the cloth sad Unfortunately I can't seem to find one that has it. However, take this awesome video as consolation:



And one last thing from Chris which has nothing to do with space at all but is still really cool...

a2 + b2 = flat coke





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Edited by HarbingerDawn - Friday, 19.04.2013, 00:01
 
HarbingerDawnDate: Friday, 19.04.2013, 15:09 | Message # 165
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Glorious new IR image of the Horsehead Nebula from Hubble (note all the galaxies) (click for full res w/o title)





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