Starship Asterisk*

MargaritaMc wrote:What an intriguing picture! As it opened in my browser I thought for a moment that it was a roll of BUBBLE WRAP!
Margarita

emc wrote:But the Moon is no slug (or creepy crawly caterpillar) traveling at well over twice and not far from three times the speed of sound... sound that it isn’t making since it has no medium for sound to travel through in outer space.

emc wrote:Hi Chris, When you say that nebula and SNR remnants look as they do because of sound passing through them, are you referring to stimuli such as other SNs or do the sound waves coincide with the SN within its own medium? And is the “right ears” placing a radio transmitter on the surface of the moon?

Chris Peterson wrote:And yet... there is a medium in space, and sound does travel through it. All those fantastic nebula and SNR remnant images we see on this forum look as they do because of the passage of sound through them. That is the primary mechanism that forms their structure.

The Moon makes a sound that carries through space. It's not very loud, for sure, but it's there if you have the right ears to pick it up.

Chris Peterson wrote:

emc wrote:Hi Chris, When you say that nebula and SNR remnants look as they do because of sound passing through them, are you referring to stimuli such as other SNs or do the sound waves coincide with the SN within its own medium? And is the “right ears” placing a radio transmitter on the surface of the moon?

All of those shock waves we see in nebulas are essentially created by sound- particles transferring momentum to adjacent particles, in a cascade. The sound energy may be local, or it may be external.

You listen to sound with a microphone- a device that records changes in the pressure of a medium. In a near vacuum, you would do that by literally counting particle collisions with a sensor. No EM devices like radios are involved.

emc wrote:I get nebula as a sound medium.

So the Moon makes sound as it hits particles in space. So if the Moon were the right type of sensor, we would hear it moving through space. How would the sensor broadcast to our ears?... or is that a silly question?

emc wrote:
So the Moon makes sound as it hits particles in space. So if the Moon were the right type of sensor, we would hear it moving through space. How would the sensor broadcast to our ears?... or is that a silly question?

http://en.wikipedia.org/wiki/Quake_%28natural_phenomenon%29#Moonquake wrote:
<<A moonquake is the lunar equivalent of an earthquake (i.e., a quake on the Moon). They were first discovered by the Apollo astronauts. Moonquakes are much weaker than the largest earthquakes, though they can last for up to an hour, due to the lack of water to dampen seismic vibrations. Information about moonquakes comes from seismometers placed on the Moon by Apollo astronauts from 1969 through 1972. The instruments placed by the Apollo 12, 14, 15 and 16 functioned perfectly until they were switched off in 1977.

According to NASA, there are at least four different kinds of moonquakes:

• Deep moonquakes (~700 km below the surface, probably tidal in origin)
  Meteorite impact vibrations
  Thermal moonquakes (the frigid lunar crust expands when sunlight returns after the two week lunar night)
  Shallow moonquakes (20 or 30 kilometers below the surface)

The first three kinds of moonquakes mentioned above tend to be mild; however, shallow moonquakes can register up to 5.5 on the Richter scale. Between 1972 and 1977, twenty-eight shallow moonquakes were observed. On Earth, quakes of magnitude 4.5 and above can cause damage to buildings and other rigid structures.>>

emc wrote:Sounds cool! (no pun intended… this time) I would love to hear the Moon!

emc wrote:if the moon were to speak
would we be humbled
all those howlings
rebounding

http://www.youtube.com/watch?v=LAPEqFL96-Q wrote:

Click to play embedded YouTube video.

Published on Apr 1, 2013

Hope wrote a song that names all of the natural satellites (moons) in our solar system, based off of Tom Lehrer's, The Elements Song.

There's amalthea n halimede adrastea prometheus
n eurydome enceladus n harpalyke puck proteus
ophelia cordelia titania n oberon
miranda nix n hydra n laomedia n rhea bebionn
sponde n kale larissa sycorax n desdemona moon
n thelxinoe dysnomia n ferdinand n themisto
n prospero albiorix n stepheno n callirrhoe
n ariel n cressida n skoll charon n callisto

There's polyduces praxidike n eukelade n ganymede
epimethus n kallichore himalia and farbauti
hyperion greip hyrrokkin n rosalind n belinda n autonoe n suttungr n methone arche n pandora

There's cyllene thebe herse setebos n chaldene kore ymir calypso
n iocaste n isonoe n erinome n telesto
n pasiphae n hegemone n jarnxasa erriapus
n daphnis aegir sinope neso mundilfari loge metis
there's megaclite n pasithee n thalassa n galatea
n umbriel n margaret and francisco n euporie
n siarnaq carme mab paaliaq iapetus n europa
n bergelmir n thyone anthe n elara n perdita

There's phobos deimos io carpo bestla sao n aoede
aitne kalyke hermippe leda tethys n skathi hati
n helike janus phoebe titan taygete mnene n orthosie
n mimas tarvos kiviuq tarqeq thrymr narvi euanthe

Theres ananke lysithea n dione helene nerid
n atlas fornjot fenrir pallene ijiraqq cupid naiad
n juliet portia aegaeon caliban namka triton hiaka sutur kari bianca trinculo psamathe pan

These are the only natural satellites of which are in our solar system plus despina and weird numbered ones of which i could not all fit in!

mjimih wrote:now who would make a 10 min video that repeats every 2 seconds?!

emc wrote:So if we stuck a microphone in the Moon, we might hear it rumble and grumble... from famishment and physics... for bakes and quakes

APOD Robot wrote: Near the top, the Moon just grazes the southern edge of Earth's dark central shadow, or umbra.