amazing science/nature images

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ukimalefu
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Post by ukimalefu »

Chemical sorcery, aluminium+mercury

https://www.youtube.com/watch?v=IrdYueB9pY4
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dv
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Post by dv »

IMG_1879.jpg


I took this one. Some kind of reflection thing happened, so you can actually see the partially obscured disk to the left of the glare from the sun/clouds.

I had only just started going through my shots. This one the only one that came out with anything good.
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Post by DukeofNuke »

Some kind of eclipse sun-dog.

Dude, e-mail that to some astronomer somewhere. That might be, like, totally unique.
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Post by DEyncourt »

DukeofNuke wrote: Some kind of eclipse sun-dog.

Dude, e-mail that to some astronomer somewhere. That might be, like, totally unique.

Um, nah, don't bother. Such lens effects are sometimes TOO common.
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Post by ukimalefu »

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Post by TOS »

holy moly

watching that video is like a religious experience for me

i admit i do wish i could see time-lapse video of the clouds swirling and whirling
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ukimalefu
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Post by ukimalefu »

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Post by juice »

Release the kraken!
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Post by ukimalefu »

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Post by juice »

Is that Jabba's palace?
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ukimalefu
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Post by ukimalefu »

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Post by ukimalefu »

2017 North America Total Solar Eclipse Close-up Real-time 4K

They call it "real time" but I believe it's a time lapse. Looks cool anyway.
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Post by DEyncourt »

ukimalefu wrote: 2017 North America Total Solar Eclipse Close-up Real-time 4K

They call it "real time" but I believe it's a time lapse. Looks cool anyway.

No, that was real time. Totality at Warm Springs, OR, was just 2 minutes long.
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Post by ukimalefu »

Saturn from Cassini

https://vimeo.com/11386048
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Post by ukimalefu »

Encedalus from Cassini

Image

-

Cassini plunges into Saturn this weekend :(

more images here

https://saturn.jpl.nasa.gov/galleries/images/
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Post by ukimalefu »

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Post by user »

duck duck go
Aw, he's no fun, he fell right over.

Science is Truth for Life. In FORTRAN tongue the Answer.

...so I'm supposed to find the Shadow King from inside a daiquiri?
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Post by DEyncourt »

user wrote: collared kingfisher collared kingfisher go

FTFY
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Post by user »

walks like a duck....
Aw, he's no fun, he fell right over.

Science is Truth for Life. In FORTRAN tongue the Answer.

...so I'm supposed to find the Shadow King from inside a daiquiri?
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Post by DEyncourt »

I dunno. If anything gets MOST people's attention, it is the bill. People sometimes call the platypus "the duck-billed playtypus" (heh, as if there were any other kind) and the hadrosaurids sometimes are collectively called "duck-billed dinosaurs".

For all I know kingfishers may even quack like a duck but they distinctly do not LOOK like a duck.
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Post by TOS »

the road to space is paved with many a boom-boom

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Image
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Post by dv »

"You will not go to space today."

Play Kerbal Space Program.
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Post by maurvir »

TOS wrote: the road to space is paved with many a boom-boom

Image

Image


A Youtube video with all of those "landings"

https://www.youtube.com/watch?v=bvim4rsNHkQ
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Post by chikie »

I saw a comment that Elon Musk is so rich he plays KSP for real.
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Post by ukimalefu »

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Post by ukimalefu »

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Post by ukimalefu »

Cassini's last image

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Post by dv »

ukimalefu wrote: Cassini's last image

Image


"That's no moon..."
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Post by ukimalefu »

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Post by ukimalefu »

Earth and Moon from Saturn

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Post by TOS »

should they be that far apart from that distance?
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Post by DEyncourt »

A drawing of the Earth-Moon system to scale:

Image

That should drastically recalibrate one's view of what happened during the recent solar eclipse.

Given that all the planets in the Solar System are in a plane (sorry, Pluto) then likely the separation seen in uki's pic was NOT at the maximum possible.

I took a close look at that pic. The BRIGHT part of the Earth is 4x4 pixels but it lights up an area that is 6x6 pixels less the corners of that square. On the other hand the Moon's BRIGHT part is 1x1 pixels but extends VERY dimly over 3x3 pixels, so the Moon was just barely larger than 1 pixel. Which shouldn't be surprising given the relative "primitiveness" of Cassini's digital cameras.
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Post by dv »

TOS wrote: should they be that far apart from that distance?

Depends on the FoV of the camera.
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Post by dv »

DEyncourt wrote:Given that all the planets in the Solar System are in a plane (sorry, Pluto)


No they are not.

http://www.astronomynotes.com/tables/tablesb.htm

First table - orbital properties. - inclination column.
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Post by DukeofNuke »

TOS wrote: should they be that far apart from that distance?

I would have thought farther apart; but apparently the Moon is not at apogee.

Also, foreshortening ...
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Post by DEyncourt »

dv wrote:
DEyncourt wrote:Given that all the planets in the Solar System are in a plane (sorry, Pluto)


No they are not.

http://www.astronomynotes.com/tables/tablesb.htm

First table - orbital properties. - inclination column.

<sigh>

Are all the planets in a PRECISE plane. No, there are slight deviations.

Are any of those deviations so great that they should never be described as "in a plane"?

Frankly this is more a "potayto, potahto" type of argument.
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Post by ukimalefu »

DEyncourt wrote:
dv wrote:
DEyncourt wrote:Given that all the planets in the Solar System are in a plane (sorry, Pluto)


No they are not.

http://www.astronomynotes.com/tables/tablesb.htm

First table - orbital properties. - inclination column.

<sigh>

Are all the planets in a PRECISE plane. No, there are slight deviations.

Are any of those deviations so great that they should never be described as "in a plane"?

Frankly this is more a "potayto, potahto" type of argument.


I didn't know this, so I googled it

Image
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Post by DEyncourt »

DukeofNuke wrote:
TOS wrote: should they be that far apart from that distance?

I would have thought farther apart; but apparently the Moon is not at apogee.

Also, foreshortening ...

I tried playing around with that image I posted showing the Earth-Moon system to scale, re-scaling it to approximate what the Earth-Moon looked like in that Cassini pic. The best I could estimate was that in the Cassini pic the distance between the Earth and Moon was between 1/3rd to 1/4th the distance it could be when at their average maximum separation.

The difference between the Moon's perigee and apogee is about 10% (362 K km vs. 405 K km, respectively) but while when this happens can be crucial for the quality of solar eclipses, it was likely that the Cassini pic was taken when the Moon was seen closer to the Earth simply due to its orbit around the Earth. Given that in the Cassini pic the Earth appeared to rather well-lit, I am guessing that the Earth was on the far side of its orbit relative to Saturn, making the Earth closer to gibbous phase.
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Post by DEyncourt »

ukimalefu wrote:
DEyncourt wrote:
dv wrote:
DEyncourt wrote:Given that all the planets in the Solar System are in a plane (sorry, Pluto)


No they are not.

http://www.astronomynotes.com/tables/tablesb.htm

First table - orbital properties. - inclination column.

<sigh>

Are all the planets in a PRECISE plane. No, there are slight deviations.

Are any of those deviations so great that they should never be described as "in a plane"?

Frankly this is more a "potayto, potahto" type of argument.


I didn't know this, so I googled it

Image

Now take each of those lines and draw their lengths proportionally to each planet's orbit around the Sun. On my MBP's screen the entire length is about 9 cm.

Taking the entire left-to-right length of those lines to be the orbit of Neptune (average 30.1 billion km), then the orbit of Mercury (average 58 million km) is about 0.002 times that. Less than a pixel on my screen.

Even Saturn--at an average orbital distance from the Sun of 1.429 billion km and being that HUGE 2º 29' off the Earth's ecliptic--would have a line that is 0.047 times that length. On my screen Saturn's line would extend about 4 mm in length from the left.
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Post by ukimalefu »

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