A roar on the other side of silence

You only have to imagine being in a desert to realise the variety of sounds a microphone on the surface of Mars could record – and how they can be interpreted. First of all, the wind, whistling across the planetary landscape – how fast is it travelling? How often does it vary in speed or direction? What does a dust devil sound like? Or a dust storm? What about the crack of thunder associated with a lightning bolt? Or the variation in pressure during an electric storm? Once the wind drops, the gentle sounds that break the silence can be heard: the settling of dust grains disturbed by the wind.

– from What does the solar system sound like? by Monica Grady.

In a review of Trevor Cox's delightful Sonic Wonderland, I invited meditation on: the sound from black holes (B flat 56 octaves below middle C); reverberations through loops in the Sun's outer atmosphere; and a wind shuffling rock grains through the Martian air.

Sound waves from the great storm that is the red spot on Jupiter may be the cause of heating in its upper atmosphere.

A creative interpretation of the old idea of  the 'music of the spheres.'  , which I have come across thanks to Stephon Alexander's The Jazz of Physics is an interpretation of Johannes Kepler's The Harmony of the World by Willie Ruff and John Rogers.


Image via APOD

"I must dream of a future that is different from the past"

I must dream of a future that is different from the past. A future that has in it everything my people need.
My ancestors and my fathers have dreamed of this future, and I have tried in my life, in my times, to bring it to reality. But I will not see it all, and I will not see the reality, only the dream.
Now when I am at Dhanaya, my most special place, I see the future running above the water, down the blue skyline and through the horizon, as if it were on a projector screen revealing to me a portrait of the future. At other times I see a beautiful painting, created by the hands of masters, now broken into a thousand pieces. Those pieces are split up and thrown about, and I am seeking always to put them back together, to refit the pieces, to re-create the picture as it should be and then to hang it again on the wall – a beautiful picture for all to see.
In these moments I tune myself up so high that sometimes I can’t even hear myself think. I wonder, then, who understands me, who could understand?

— Galarrwuy Yunupingu

Image: Planet Elto

Aliens and angels

We have only just begun to live with smart machines. While we worry today about killer robots, the challenges to come may be turn out to be much stranger. One day, we may find ourselves living alongside aliens and angels.

from Forget killer robots: This is the future of supersmart machines by Sumit Paul-Choudhury

Image adapted from Murray Shanahan

Two seconds of revelation

For generations most things people could see in the heavens never changed shape. The Moon and some comets were obvious exceptions.  Only recently has it been possible to see, with the aid of technology, the dynamism of the Sun's atmosphere, or movement in the clouds of Jupiter.

But images of change at larger scales — such as animations of galaxy evolution and distribution here and here — remain artefacts of reason, imagination and ingenuity rather than direct observation.

Our experience of stars, nebulae and supernovae is still mediated through static though often spectacular photographs.  Given how slowly the stars seem to change during a human lifetime this seems almost inevitable.

In this context, a clip showing fifteen years' expansion of the Tycho Brache Supernova remnant feels like something particularly remarkable, at least to me. At two seconds (blink and you'll miss it), it is the same length as the 1888 Roundhay Garden Scene, and no less momentous.

Slowth

Elizabeth Bishop had, and Annie Dillard has time for lichen.

In The Shampoo, Bishop writes

The still explosions on the rocks
the lichens, grow
by spreading, gray, concentric shocks.
They have arranged
to meet the rings around the moon, although
within our memories they have not changed.

Dillard, echoes the extraterrestrial leap, noting in The Eclipse that photographs of the Crab Nebula taken fifteen years ago seem identical to photos of it taken yesterday, even though it is expanding at seventy million miles a day. Botanists, she continues, have measured some ordinary lichens twice, at fifty year intervals, without detecting any growth.

Here, from a profile of the lichenologist Kerry Knudsen, is a scrap of ground-truthing with regard to lichen:

Lichens grow very slowly and certain species have extraordinarily long lifespans. Samples of Rhizocarpus geographicum, a lichen that grows in the arctic, were determined to be over 8,000 years old.

But lichens are not always slow. When it rains on individuals of genera Acarosporaceae,  hydraulic pressure is applied to the ascus, a cylindrical structure containing spores,  launching them into the air  at 250 miles per hour. Many spores land nearby but others drift up into the stratosphere and may float for hundreds of miles.

(Added 30 July:  recent analysis has revealed a third symbiotic organism in lichen, hiding in plain sight alongside the familiar two, that has eluded scientists for decades.)


Photo Willie 'Curry'

Hidden

Evolution has shaped us with perceptions that allow us to survive. They guide adaptive behaviors. But part of that involves hiding from us the stuff we don’t need to know. And that’s pretty much all of reality, whatever reality might be.

Donald Hoffman

Moonbow photo courtesy Calvin Bradshaw via wikimedia

One display to rule them all

In which human dreams are swallowed, or expanded, without limit:

With a VR platform we will create a Wikipedia of experiences, potentially available to anyone, anywhere, anytime. Travel experiences—terror at the edge of an erupting volcano, wonder at a walking tour of the pyramids—once the luxury of the rich (like books in the old days), will be accessible to anyone with a VR rig. Or experiences to be shared: marching with protesters in Iran; dancing with revellers in Malawi; how about switching genders? Experiences that no humans have had: exploring Mars; living as a lobster; experiencing a close-up of your own beating heart, live.

from The Untold Story of Magic Leap

Humpback: Zorankovacevic via wikimedia