So is it Mercury or is it music?
I can recall being surprised that instrumental music was included on a JPL or a NASA video once or twice, but I think it is pretty common to do so now, particularly when one is just "looking at landscape", so I no longer think about it. I have some trouble believing that anyone would think it was actual sound from nature, but I guess it is a slight risk for misinterpretation.
JohnD wrote:It gave Mercury a strange appearance, as if it was transparent over a deeper solid surface, like dust and leaves floating on a puddle.
Anyone else have that sensation?
I noticed it too, and guessed it was from trying to induce proper movement of frames that did not match up at the edges or something.
But I like how you put it. Kind of like it was a semi-transparent planetary crust.
By the way, when I was a kid, they told me that Mercury was tidally locked to the Sun, 1 rotation per revolution (synchronous rotation). Today I learned that instead, Mercury is much more interesting! It has been locked into a "Rotation–orbit resonance" of 3:2 (3 rotations per 2 revolutions). And this results in:
- The planet does have day and night everywhere on the surface other than the poles;
- The day (sunrise to sunrise, not sidereal) is two times as long as its year;
- The apparent movement of the Sun across the sky is very slow at perihelion, probably almost stops, but not quite;
- The earlier mistaken information that Mercury was tidally locked is somewhat forgivable. It is *hard* to observe the surface of Mercury from Earth. And there are only certain times and positions where you can get a relatively good look, and those times were in resonance of the motions of Earth and Mercury in such a way that observers were fooled into missing the complexity of Mercury's motion. But at least some people knew better even when I was a child. But pre-internet, it was nothing to be learning from materials that were a decade or more old.