Extrasolar maelstrom!

22 10 2011

This week might be considered a red-letter period for discoveries relating to extrasolar planets, from imaging alien comets and their implications for otherworldly oceans to witnessing the dusty disks and primordial protoplanets of young, forming star systems.

In case you missed it, this week provides your healthy dose of Exoplanetology:

Very “Wet” Extrasolar System Found

Artist's concept, illustrating an icy planet-forming disk around the young star called TW Hydrae. (Credit: NASA/JPL-Caltech )

The European Space Agency’s Herschel Telescope recently discovered direct evidence of cold water vapor surrounding the disk of dusty material surrounding a young star.

Whereas earlier studies had detected evidence of warmer water vapor within the material of young star systems, this is the first to extend this zone of water vapor into the cold regions extending far away from the parent star, TW Hydrae.

This finding is very significant to those searching for habitable planets or the life that might arise on them, as it bolsters the idea that comet-strewn planetary systems like our own (with water-rich inner planets) might be common in the galaxy.

Heavy Comet Bombardment Observed in Alien Solar System

Artist's concept, illustrating a storm of comets around nearby star Eta Corvi. (Credit: NASA/JPL-Caltech)

Evidence of the comet storms suggested in the previous discovery and which left their own scars on the rocky worlds of our own Solar System during the period called the Late Heavy Bombardment, (look up at the moon for evidence,) has been detected in the nearby star system Eta Corvi.

Tantalizingly, NASA’s Spitzer Space Telescope has detected evidence of a titanic comet collision(s) – dust fragments that match the signature of a comet having been wiped out during an impact with a planet.

Further, the location of the dust plume coincides with the potential location of inner, rocky planets like our own…

Forming Planets Likely Culprit Dust-Sculpters

View of two spiral arms in the gas-rich circumstellar disk around star SAO 206462. (Credit: NAOJ/Subaru)

In a wave of discoveries that don’t seem to be letting up, researchers using the Subaru Telescope atop Mauna Kea in Hawaii have released images of spiral arms in the dust disk surrounding nearby star SAO 206462.

These images, the first of their kind, agree with simulations of what the gravitational effects of newly formed or forming planets can do to the gas and dust surrounding a young star.  (Researchers are cautious to point out, however, that other processes might be responsible for the pattens.)

Beyond potentially further bolstering our understanding of how planets and star systems form, the spirals suggest locations of further research to find extrasolar planets… and provide yet another serious contender for desktop wallpapers everywhere.

Humankind First: Birth of an Alien World Witnessed

Artist’s conception of newly born alien planet LkCa 15 b and its parent star. (Credit: Karen L. Teramura, UH IfA)

Not to be outdone by the truly significant discoveries already mentioned, a team of researchers using the Keck Observatory in Hawaii have imaged the youngest alien world to date – so young, in fact, that it is still forming out of the disk of gas and dust around star LkCa 15.

Using sophisticated optical techniques, the team was not only able to resolve the protoplanetary disk around the star LkCa 15, but they were able to peer into the zone where the new planet was spawning – a wide gap between the young parent star and an outer disk of dust.

What they found there was truly a first:  A protoplanet surrounded by a sheath of cooler dust and gas still falling into/onto the still-forming planet.

In all, it appears that with an accelerating pace the universe is becoming less a tapestry to simply observe and more an atlas of locations and potential destinations.  Will the names TW Hydrae, Eta Corvi, SAO 260462, and LkCa 15 one day fill an atlas of solar systems the way we now appraise continents on a globe?

-And will the subtle letters behind each name, themselves indicating the presence of a planet, fill the same atlas as we currently manage nations and provinces?

We can only hope… but at this rate, odds are looking good!

Advertisements




Japanese lunar light farming

1 06 2011

Rendering of a solar array ring on the Moon's surface. (Credit: Shimizu Corporation)

Definition of mixed emotions: Reading an ambitious plan recently released by the Shimizu Corporation of Japan that effectively wields fear of radiation to incentivize lunar colonization for solar power generation. 

Wow.  While I abhor anything that preys upon the irrational fear of nuclear energy, I’m all for the use of solar power.  (I’d like to make the ironic point here that “solar power” is also nuclear energy – the result of a giant nuclear fusion reactor, albeit a natural one.)  I’m also certainly for anything that makes an extraterrestrial business case, and I further endorse any plan that leads us off-world so that we can begin developing the practical know-how to live there.  Throw in the fact that the endeavor would ease stress on the terrestrial ecosystem at the same time, and the idea seems like a home run.

Diagram depicting the lunar power delivery process. (Credit: Shimizu Corporation)

How does it work?  Quite simply.  Called the LUNA RING, solar arrays are to be installed across the lunar surface in an equatorial belt.  Panels on the sun-facing side of the Moon then deliver energy via circumferential transmission lines to laser and microwave transmitters on the Earth-facing side.  These transmitters then beam the energy to receiving stations on the Earth, providing power enough for all.

Sound too good to be true?  Well, it may be.  The problem, like many great ideas, is funding.  The technology is all but completely available to make an attempt, but the capital costs here are incomprehensible.  Yet-to-be-invented tele-robotics plays a major role in construction, (which as I’ve previously mentioned is a very smart move,) and when weighed in combination with untried lunar transport, operations, and manufacturing techniques, equates to a seriously steep R&D curve.

However, this sort of distance planning can demonstrate that the basic elements already exist, which may be exactly what we need to convince  governments and the power industry that the venture is possible.  And, if Japan suddenly puts the economic weight of the government behind a plan like this, e.g., by making a call to return to the Moon and by actually launching small-scale versions of this system, then we should all take note… and I believe we should all participate.

The International Space Station is an endeavor that has and will continue to benefit many.  An international effort to establish renewable lunar-terrestrial power production can benefit everyone, both immediately as well as by developing the skills we’ll need to expand into the cosmos.

Good on ya’, Shimizu Corporation, for thinking big.  Hopefully it’ll catch on.








%d bloggers like this: