Satellite . . - a photo on Flickriver

Satellite . .

            The moon, our dead companion we have been dragging along for donkey's years (>4.5 billion years are the estimates).
She is our only satellite, and reflects just 13% of the received sunlight, meaning that the other 87% is transfered into heat.

That also means that the "day-side" of the moon, temperatures reach plus 120°C, and on its "night-side" over minus 170°C

Temperature in fact - as we know it - does not exist in space.
It's a measure of the movement of molecules, hence energy and mass, and molecules do not exist in the vacuum of space.
That's also the reason that there is no sound in space, there simply are no molecules to transport it.

Due to the lunar libration, we are able to see 59% of its surface, always the same side, because the rotation time of the moon equals the cycle time of the moon around the earth.

Mind you, as mentioned, the moon has no atmosphere of any significance, so in contrast to the earth, we talk about the surface temperature here, not its "air" temperature.

And when you see the moon having a yellow(ish) color on a picture, you know that the picture has been taken when the moon stood not far from the earth's horizon (from the photographers point of view).
Does she glow even more red, then the picture was taken almost directly above the earth's horizon.

Not that the moon changed her color, but the earth atmosphere does that by filtering out all the other colors (Rayleigh diffusion) in the spectrum, since the reflected sun beams have to travel through a longer path of our atmosphere, and the color red, being a color with a longer "wavelength", is far less effected by the mentioned Rayleigh diffusion.

Energy never gets lost, it just transfers into an other form.
(first law of thermodynamics)

Oh, and if you're under the impression that the moon has no real impact on us . .
That may be.

But tell me, how come we have high- and low tide here on earth.
I mean, something is lifting-up entire oceans half a meter high . .
   

Taken on: April 9, 2022

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Sets appears in: • Our moon and sun • Skies

Camera: Sony SLT-A58, f/7.1, 1/800 sec, 300mm (=450mm), ISO 100 (more info) (hide info)

Camera:	Sony SLT-A58
Lens:	70-300mm F4-5.6 SSM
Aperture:	f/7.1
Exposure Time:	0.001 sec (1/800)
Focal Length:	300mm (35mm equivalent: 450mm)
ISO:	100
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Aperture-priority AE
Exposure Mode:	Auto
Metering Mode:	Center-weighted average
White Balance:	Auto
Saturation:	Low
Sharpness:	Hard
Color Space:	sRGB
Software:	Windows Photo Editor 10.0.10011.16384
Show full info

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