One of the cruelest jokes ever
performed on humanity is its shared delusion of significance. Human
cultures are filled with lies of how we occupy some special place in
the cosmos symbolizing our importance. The truth being that we are
part of an infinite universe that gets steadily more complicated from
our discoveries and observations. The best that can be said about our
species is that we are momentary sparks of awareness inhabiting a
microscopic sliver of eternity.
One of the discoveries that remind me
of our true place in the universe is Hoag's Object. It is a rare,
nearly symmetrical ring galaxy six-hundred million lightyears away
from our planet. Discovered in 1950 by astronomer, Arthur Hoag, he at
first believed it to be a planetary nebula- a shroud of gas expelled
from a star in the last stage of its life. The truth being that it's
a galaxy with a diameter of 120,000 lightyears and consisting of 700
billion stars.
As you can see from the picture, the
weirdness of Hoag's Object comes from its shape with young blue stars
and plenty of interstellar gas making up the outer ring. The inner
core in turn consists of older stars with little to no interstellar
gas that would create new stars. There are other ring galaxies we can
see from our telescopes but none as clearly defined as Hoag's.
If you paid any attention to science
classes while in school, you would remember that there are multitudes
of spiral galaxies like our own in the universe, as well as
elliptical galaxies that look similar to the center of Hoag's. The
big question of course, is what caused Hoag's Object to develop this
highly unusual structure. Most reasonable theories appear to involve
a collision between two or more galaxies with the aftermath producing
what we see from Earth. And yes, what we see of Hoag's Object today
existed 600-hundred million years ago since the light from all those
stars took that long to reach our planet.
For me the truly bizarre nature of
Hoag's Object is the idea that in the outer ring star formation will
continue producing more planets as well and hopefully intelligent
life. And unless there is a sudden influx of interstellar hydrogen
from some source, the stars in the center will eventually die and not
be replaced.
How would humanity have reacted if we
learned our own galaxy had such a peculiar nature? Think about it,
for centuries we burned people to death who dared to question the
accepted idea that our planet occupied the center of the universe.
That the moon, planets, our sun, and all the stars in the sky
revolved around Earth.
Going beyond my idle hypothetical alien
speculations, here's some real, factual strangeness to think about.
Hoag's Object is so are away that its apparent width is only one
quarter of an arcminute. That's about the same width when we look at
the planet Mercury from Earth. Looking at the picture of Hoag's
Object above you will see another ring galaxy, much further away in
distance, in the space between the outer ring and the core. Given the
truly rare nature of ring galaxies, the chances of that happening are
astronomical. No pun intended!
5 comments:
Fascinating !
Well that just makes me feel really really tiny. And also, that maybe it doesn't matter if I eat a donut or not...
Or, it means that if we are known, we're really, really special :)
www.thepulpitandthepen.com
I take great comfort in our insignificance. It helps me keep everything in perspective.
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