Ezekiel’s vision

Ezekiel’s vision

"The Vision of the Prophet Ezekiel" by Ditlev Blunck (1830)

Originally published 13 March 2005

As I ease into retire­ment, I have tak­en to spend­ing part of each year on a qui­et lit­tle island in the Caribbean. I came here look­ing for win­ter warmth, of course, but also for dark skies. I am a stargaz­er by life­long habit, and my pri­ma­ry home near a major Amer­i­can city is awash in arti­fi­cial light.

For the time being at least, the island is sat­is­fy­ing­ly free of light pol­lu­tion. Comet Mach­holz, which passed by recent­ly, was an easy naked-eye object. Back in the States it would have been lost in the per­va­sive orange glow which pass­es as a night sky.

Moon­less mid­win­ter evenings on the island are ide­al for sky­watch­ing. Stars in their thou­sands wheel over­head, from east to west. Or so it seems. It is some­times said that the art of stargaz­ing is 10 per­cent per­cep­tion and 90 per­cent imag­i­na­tion. I try to imag­ine myself on the spin­ning Earth, whirling east­ward at 1000 miles per hour, under the fixed stars.

In the west a band of faint light reach­es up almost ver­ti­cal­ly from the place on the hori­zon where the Sun has set, as if from some enchant­ed city, just there, over the hori­zon. This is the time of year when the light is best seen, but only from the dark­est places. It is called the zodi­a­cal light, and lies along the con­stel­la­tions of the zodiac.

The glow is caused by sun­light reflect­ed from mete­oric dust lying in the plane of the solar sys­tem, left­over debris from the great flat pan­cake of whirling dust and gas that gave birth to the solar sys­tem 5 bil­lion years ago. We ride on the plan­et Earth with that cloud of primeval dust, around the Sun once each year, fly­ing at 67,000 miles per hour through the space of the galaxy.

Anoth­er band of pale light, the win­ter Milky Way, arch­es over­head from north to south, stream­ing down at Ori­on’s back, the light of bil­lions of stars indi­vid­u­al­ly too faint to be vis­i­ble to the unaid­ed eye, stars that with our Sun are part of the spi­ral­ing disk of hun­dreds of bil­lions of stars we call the Milky Way Galaxy.

The Milky Way Galaxy turns on its pon­der­ous axis once every 200 mil­lion years. We reside about two-thirds of the way out from the cen­ter of the disk, just on the inside of one of the spi­ral arms. As the galaxy spins, our Sun is car­ried with it, at 630,000 miles per hour, in a great cir­cle with a radius of 30,000 light-years.

At this point my head spin­ning. Wheels with­in wheels with­in wheels, like the vision of the prophet Ezekiel.

But my flight isn’t over yet. In the north­west­ern sky, in the con­stel­la­tion Androm­e­da, I can just make out a blur of light, too fuzzy to be a star, like a smudge on the dark win­dow­pane of night. This is the cen­tral part of the Great Androm­e­da Galaxy, anoth­er giant spi­ral, a near twin of the Milky Way Galaxy and the clos­est spi­ral galaxy to our own.

The Androm­e­da Galaxy is 2 mil­lion light-years away. The light that enters my eyes left the there at about the time our first hominid ances­tors were appear­ing in Africa. It is the old­est light that we can see with­out ben­e­fit of a telescope.

The Androm­e­da Galaxy is part of what is called the Local Group of galax­ies. Our galaxy and the Androm­e­da Galaxy are mov­ing towards each oth­er — adding anoth­er 300,000 miles per hour to my cos­mic flight.

And that is about as far as I can go with 10 per­cent per­cep­tion and 90 per­cent imag­i­na­tion. For the last step of my flight I need 100 per­cent imag­i­na­tion. Beyond the Local Group of galax­ies there is no object I can see with the unaid­ed eye.

The Local Group is col­laps­ing, pulled togeth­er by the mutu­al grav­i­ty of its mem­bers. But the uni­verse as a whole is expand­ing. The galax­ies are fly­ing apart from the impe­tus of the Big Bang, 13 bil­lion years ago, when the uni­verse was born from an infi­nite­ly hot, infi­nite­ly small seed of ener­gy. The uni­verse is blow­ing up like the sur­face of an inflat­ing bal­loon, and like dots paint­ed on the bal­loon, the galax­ies are rac­ing apart.

It does­n’t make much sense to say what speed the infla­tion adds to my cos­mic flight. Speed with respect to what? I can tell you how fast I am mov­ing away from any par­tic­u­lar dis­tant galaxy, but what’s the point when there are hun­dreds of bil­lions of galax­ies we can see with our most pow­er­ful telescopes.

Galileo got him­self into a lot of trou­ble for sug­gest­ing that the Earth moves, and he did­n’t know the half of it. His oppo­nents said that if we were car­ried along at 1000 miles per hour on a spin­ning Earth we would be blown over back­wards, tum­bling head over heels with every­thing else that was­n’t tied down.

Galileo had to invent a new kind of physics, with a new con­cept of iner­tia, to explain why we can stand upright on our breath­tak­ing flight through space, but it took a while before the imag­i­na­tions of his con­tem­po­raries caught up with him.

It still takes a prac­ticed imag­i­na­tion to fly unper­plexed on the speed­ing Earth. On these mid­win­ter evenings, on this dark island, when the zodi­a­cal light reach­es up from the west­ern hori­zon, the Milky Way streams over­head, and the faint smudge in Androm­e­da is just vis­i­ble in the north­west, I close my eyes and fly through space in my mind’s eye, as Galileo asked us to do all those many years ago.

And while I’m at it, I take time to remem­ber that blind old man kneel­ing on the floor of the Office of the Inqui­si­tion in Rome, hav­ing renounced his belief in the dou­ble motion of the Earth, whis­per­ing — as leg­end has it — under his breath, “And yet it moves.”

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