The
tiny Saturnian moon of Enceladus was in the news a few weeks ago. Data sent back from the Cassini spacecraft indicated the
possibility of a subsurface body of water the size of Lake Superior, lying
about 20 to 25 miles beneath the moon’s icy face. No one has actually observed this underground
sea, though geysers of ice crystals have been detected at the moon’s south
pole. There is no direct evidence, only
a series of inferences based on analysis of the satellite’s gravitational
field. Discrepancies in the strength of the
gravitational field at the south pole have been measured; this has led some to
speculate that only liquid water would have sufficient density to account for these
differences. Thus, there must be an enormous underground body of liquid water
near the south pole.
A
variety of life forms have adapted to living in the eternal darkness of Earth’s
underground rivers and lakes—and have thrived in even more extreme
environments. Why not deep within
Enceladus, at the bottom of its silent subterranean sea, kept warm by the intense
gravitational pulls of Saturn and its sister moons? This possibility makes Enceladus a fourth
candidate among worlds in our solar system that may harbor life. The others are
Mars, Europa, a moon of Jupiter, and Titan, another moon of Saturn.
Pretty
slim pickings.
However,
the now decrepit Kepler telescope, which so far has confirmed the presence of
962 exoplanets, has provided data identifying “the first validated, Earth-size
planet in the habitable zone of another star,” according to Dr. Quintana of the
SETI Institute and Ames Research Center. (It has conveniently accomplished this just as
the Kepler planet-finding mission came to an end last year.)
The
planet is called Kepler 186f. Some researchers
suspect that, like Earth, the exoplanet is made up largely of iron, rock, ice
and liquid water, probably has a rocky surface, and experiences a gravitational
field similar to that of our world. But
in the absence of any data about the planet’s mass, the only thing known with
any certainty is its relative size—small—and its distance from the sun it
orbits.
Kepler
186f shares its star with four other inner planets. Its sun is not like ours at all and is
classified as a red dwarf—not nearly as young or as bright or as warm as ours. One scientist remarked that Kepler 186f would
receive less light than the planet Mars receives from our sun. It would seem to be a dim, cold place, mostly
frozen unless it possesses an insulating atmosphere. The year on Kepler 186f is only 130 days
long. Keplerians, if they exist, must
file income taxes about every 4 months.
Replication of these results, ordinarily
expected of scientific research, will not be likely. Kepler 186f is 500 light years away—so a
visit there will not be possible in this millennium. It is too far out in space for serious
scientific study, yet just distant enough to inspire imaginative speculation
and fervent exobiological faith.
Several
scientists are calling a mission to Enceladus though, which relatively speaking,
is right in our back yard. If samples of
ice crystals from its southern geysers can be brought back to earth, they might
be found to contain extraterrestrial microbes—or worse. Mars has been a bust—not
even the exhalations of microbes can
be found there. But science has
demonstrated again and again, conclusively, without a doubt, without need for
replication, that wondrous energetic life exists on just one planet in the
entire universe—ours, of course. Life was
created and placed here, long ago. Its
purpose is to spread far beyond its home planet, and bring color, noise and
movement to all the dark silent worlds that surround us.
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