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originally posted by: Phage
a reply to: DiddyC
Apparently you don't know how actual holograms are created.
Those things you see in "entertainment" settings are not holograms. They are this, a quite old and simple trick.
www.comsol.com...
So unless there's a big sheet of glass in the sky, and you're above it, no. Starlink is not going to be projecting images.
Actual holograms, as produced by lasers, also require a sort of "screen". A holographic plate, actually, which the viewer looks through in order to see the 3D image.
www.holographer.com...
These speakers emit patterns of sound waves in the ultrasonic rangeâtoo high for the human ear to pick upâwhich sets up vibrations in the air that manipulate a plastic sphere slightly smaller than a sesame seed.
As the bead flies around in programmed patterns, the researchers project changing colors onto it. âWe illuminate that levitated particle using RGB LEDsâred, green, blueâso we can control the color of the scattering light,â Hirayama says.
phenomenon is known as persistence of vision. The same principle enables a visual trick often seen on the Fourth of July, when the glowing head of a sparkler appears to trace golden outlines as one moves it through the night air
originally posted by: Phage
a reply to: Observationalist
Neat.
So it wiggles a tiny piece of plastic around and you shine a light on the plastic. Groovy. Not a hologram though. And I don't think you're going to accomplish acoustic levitation from space, or anywhere but inside an acoustic chamber.
science.howstuffworks.com...
This article has a video that shows no sound chamber.
Not really. No.
Are there sound waves in space?
Are there sound waves in space?
originally posted by: Phage
a reply to: Observationalist
This article has a video that shows no sound chamber.
Please read the link I posted then look at the 2:05 point of the video.
Not really. No.
Are there sound waves in space?
Thatâs why there are so many satellites from star link.
originally posted by: scraedtosleep
a reply to: DiddyC
I think starlink has the potential to change the world in a very positive way.
Internet anywhere has many valuable applications.
originally posted by: GeauxHomeYoureDrunk
a reply to: Observationalist
Are there sound waves in space?
Common knowledge since at least the 70s:
Now yes, space is a virtual vacuum. However, sound does exist in the form of electromagnetic vibrations that pulsate in similar wavelengths.
About 250 million light years away, at the center of a cluster of thousands of galaxies, a supermassive black hole is humming to itself in the deepest note the universe has ever heard (as far as we know). The note is a B-flat, about 57 octaves below middle C, which is about a million billion times deeper than the lowest frequency sound we can hear (yes, thatâs an actual number from actual scientists).
We know this because in 2003, NASAâs Chandra X-ray space telescope spotted a pattern in the gas that fills the Perseus Cluster: concentric rings of light and dark, like ripples in a pond. Astrophysicists say those ripples are the traces of incredibly low frequency sound waves; the brighter rings are the peaks of waves, where thereâs the greatest pressure on the gas. The darker rings are the troughs of the sound waves, where the pressure is lower.