Posted on 04/10/2009 4:04:43 PM PDT by decimon
April 9, 2009: NASA's twin STEREO probes are entering a mysterious region of space to look for remains of an ancient planet which once orbited the Sun not far from Earth. If they find anything, it could solve a major puzzle--the origin of the Moon.
"The name of the planet is Theia," says Mike Kaiser, STEREO project scientist at the Goddard Space Flight Center. "It's a hypothetical world. We've never actually seen it, but some researchers believe it existed 4.5 billion years ago—and that it collided with Earth to form the Moon."
Right: An artist's concept of one of the STEREO spacecraft. [Larger image]
The "Theia hypothesis" is a brainchild of Princeton theorists Edward Belbruno and Richard Gott. It starts with the popular Great Impact theory of the Moon's origin. Many astronomers hold that in the formative years of the solar system, a Mars-sized protoplanet crashed into Earth. Debris from the collision, a mixture of material from both bodies, spun out into Earth orbit and coalesced into the Moon. This scenario explains many aspects of lunar geology including the size of the Moon's core and the density and isotopic composition of moon rocks.
It's a good theory, but it leaves one awkward question unanswered: Where did the enormous protoplanet come from?
Belbruno and Gott believe it came from a Sun-Earth Lagrange point.
Sun-Earth Lagrange points are regions of space where the pull of the Sun and Earth combine to form a "gravitational well." The flotsam of space tends to gather there much as water gathers at the bottom of a well on Earth. 18th-century mathematician Josef Lagrange proved that there are five such wells in the Sun-Earth system: L1, L2, L3, L4 and L5 located as shown in the diagram below.
When the solar system was young, Lagrange points were populated mainly by planetesimals, the asteroid-sized building blocks of planets. Belbruno and Gott suggest that in one of the Lagrange points, L4 or L5, the planetesimals assembled themselves into Theia, nicknamed after the mythological Greek Titan who gave birth to the Moon goddess Selene.
Above: Sun-Earth Lagrange points. The STEREO probes are about to pass through L4 and L5. Solar observatories often park themselves at L1 while deep space observatories prefer L2. [more]
"Their computer models show that Theia could have grown large enough to produce the Moon if it formed in the L4 or L5 regions, where the balance of forces allowed enough material to accumulate," says Kaiser. "Later, Theia would have been nudged out of L4 or L5 by the increasing gravity of other developing planets like Venus and sent on a collision course with Earth."
If this idea is correct, Theia itself is long gone, but some of the ancient planetesimals that failed to join Theia may still be lingering at L4 or L5.
"The STEREO probes are entering these regions of space now," says Kaiser. "This puts us in a good position to search for Theia's asteroid-sized leftovers."
Just call them "Theiasteroids."
Astronomers have looked for Theiasteroids before using telescopes on Earth, and found nothing, but their results only rule out kilometer-sized objects. By actually entering L4 and L5, STEREO will be able to hunt for much smaller bodies at relatively close range.
Right: This dynamical simulation shows how asteroids linger in the gravitational well of a Lagrange point of the Sun-Jupiter system. The principle of Sun-Earth Lagrange points is the same. Credit: Prof. Aldo Vitagliano/SOLEX.
"The search actually began last month when both spacecraft rolled 180 degrees so that they could take a series of 2-hour exposures of the general L4/L5 areas. In the first sets of images, amateur astronomers found some known asteroids and new comet Itagaki was imaged just a couple of days after the announcement of its discovery. No Theiasteroids however."
Hunting for Theiasteroids is not STEREO's primary mission, he points out. "STEREO is a solar observatory. The two probes are flanking the sun on opposite sides to gain a 3D view of solar activity. We just happen to be passing through the L4 and L5 Lagrange points en route. This is purely bonus science."
"We might not see anything," he continues, "but if we discover lots of asteroids around L4 or L5, it could lead to a mission to analyze the composition of these asteroids in detail. If that mission discovers the asteroids have the same composition as the Earth and Moon, it will support Belbruno and Gott's version of the giant impact theory."
The search will continue for many months to come. Lagrange points are not infinitesimal points in space; they are broad regions 50 million kilometers wide. The STEREO probes are only in the outskirts now. Closest approach to the bottoms of the gravitational wells comes in Sept-Oct. 2009. "We have a lot of observing ahead of us," notes Kaiser.
Readers, you may be able to help. The STEREO team is inviting the public to participate in the search by scrutinizing photos as they come in from the spacecraft. If you see a dot of light moving with respect to the stars, you may have found a Theiasteroid. Links to the data and further instructions may be found at sungrazer.nrl.navy.mil.
Let the hunt begin!
Bump and grind ping.
Interesting but I’m not sure taxpayers should be funding this one. I’m all for space exploration but I just fail to see the point in this one.
I remember reading all of Zecharia Sitchin’s books. I did it for their entertainment value. Hmmmm.
It's Theia-rhetical.
aka, nibiru? Planet X? etc etc etc
conming back into our solar system...sometime
2012?
to see if it’s coming back
... or at least if a big asteroid and accompanying debris field is coming back
Asteroids within the Sun-Earth Lagrange points should be in stable orbits with reason to believe that they would be doing anything other than leading or following us in orbit.
IIRC, the STEREO probe is supposed to orbit the sun at one of the LaGrange points anyway, to study the sun without interference from the Earth. This is just adding extra mission objectives for the probe as it positions itself for its main mission.
Well the sun does affect us so I guess the cost of that offsets the cost of looking proving the impact theory.
Thanks for pointing that out.
http://www.december212012.com/articles/PlanetX_Nibiru/NASA_AND_PLANET_X.htm
If it is planet X or the remains of it or a body associated with it, the orbit is elliptical and orbital plane is under our earth, an area of space we have not surveilled until fairly recently
Isn't La Grange where ZZ Top formed?
Lotta nice girls out there.
Stitchin covered this pretty good.
The Vatican is looking
http://www.maya12-21-2012.com/bell-interview-with-malachi.html
This piqued my interest
http://www.space.com/scienceastronomy/astronomy/vatican_observe_000716.html
“The VATT, which serves as a technology test-bed for a much bigger binocular telescope being built on Mount Graham, is used to study stellar evolution, galaxy structure, main-belt asteroids and large, comet-like objects in the Kuiper Belt beyond Neptune.”
At L2 they're cool, at L1 they're hot.
Rumour spreadin’ a-’round in that Texas town
‘bout that shack outside La Grange
and you know what I’m talkin’ about.
Just let me know if you wanna go
to that home out on the range.
They gotta lotta nice girls ah.
Have mercy.
A haw, haw, haw, haw, a haw.
A haw, haw, haw.
Well, I hear it’s fine if you got the time
and the ten to get yourself in.
A hmm, hmm.
And I hear it’s tight most ev’ry night,
but now I might be mistaken.
hmm, hmm, hmm.
Ah have mercy.
actually, its name was Maldek and it was located where the Asteroid Belt is currently between Jupiter and Mars...
People need to study their history...jeeeesh /sarc
"The name of the planet is Theia," says Mike Kaiser, STEREO project scientist at the Goddard Space Flight Center. "It's a hypothetical world. We've never actually seen it, but some researchers believe it existed 4.5 billion years ago—and that it collided with Earth to form the Moon."Thanks decimon.
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