![War Is Destroying Syria's Ancient Treasures, Satellite Photos Show](https://l.yimg.com/bt/api/res/1.2/QtdYaKooc7kXS8VGXeeGUw--/YXBwaWQ9eW5ld3M7Zmk9ZmlsbDtoPTY0ODtweW9mZj0wO3E9NzU7dz01NzU-/http://media.zenfs.com/en_US/News/LiveScience.com/Syria-Satellite-Image.jpg1411136829) |
Satellite images show how much destruction has happened in Syria between December 2011 and July 2014. The Ministry of Justice building (red arrow) is damaged, as is the Khusriwiye Mosque (green arrow). |
Excerpt from news.yahoo.comBy Laura Geggel, Staff Writer Three years of heavy fighting have taken a toll on Syria's archaeological treasures. Five of the country's six World Heritage sites "exhibit significant damage," and some buildings are now "reduced to rubble," according to high-resolution satellite images examined by the nonprofit and nonpartisan American Association for the Advancement of Science (AAAS).
"Only one of Syria's six World Heritage sites — the ancient city of Damascus — appears to remain undamaged in satellite imagery since the onset of civil war in 2011," Susan Wolfinbarger, director of the Geospatial Technologies and Human Rights Project at AAAS, said in a statement.
Damage to the other five sites is extensive, the AAAS said. These sites include the ancient city of Aleppo, the ancient city of Bosra, the ancient site of Palmyra, a site with two castles (Crac des Chevaliers and Qal'at Salah El-Din), and the ancient villages of northern Syria (Jebel Seman, Jebel Barisha, Jebel Al A'la, Jebel Wastani and Jebel Zawiye. The analysis showed widespread damage in Aleppo, one of the oldest continuously occupied cities in the world, which dates back to the second millennium B.C. A before-and-after analysis from 2011 to 2014 indicates new damage to historic mosques, Koranic schools called madrasas, the Great Mosque of Aleppo, the Souq al-Madina, the Grand Serail of Aleppo, the Hammam Yalbougha an-Nasry, the Khusruwiye Mosque, the Carlton Citadel Hotel, the Khan Qurt Bey caravanserai and other historic buildings south and north of the citadel.
The Great Mosque has extensive damage. Satellite imagery showed destruction of the roof and a destroyed minaret, or tall spire, as well as two craters on the mosque's eastern wall. Researchers saw the heaviest damage south of the citadel, but the area to the north, which has buildings from the late Mamluk to Ottoman periods (13th to 19th centuries) also showed signs of destruction.
The other World Heritage sites have damage ranging from mortar impacts near an ancient Roman theater in Bosra to newly constructed military compounds on an archaeological site. New roads and mounds of earth are scattered through the Northern Roman Necropolis in Palmyra.
Palmyra sits in a desert just northeast of Damascus. Its ruins combine Greco-Roman art with Persian influences, and UNESCO said it "contains the monumental ruins of a great city that was one of the most important cultural centers of the ancient world."
The AAAS released the analysis yesterday (Sept. 18), a day before the Smithsonian Institution's meeting to honor the 1954 Hague Convention for the Protection of Cultural Property. Researchers plan to discuss the damage and intervention efforts in Syria at the meeting.
"There is hope, and it lies with our Syrian colleagues because they are the stewards and caretakers of these sites, and they see the value in preserving and protecting them for future generations," said Corine Wegener, cultural heritage preservation officer for the Smithsonian Institution. "What they need from their international colleagues is some help to do that — training, materials and other support in the international arena for the notion that it is possible to mitigate and prevent damage to cultural heritage, even in the midst of conflicts."
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So is Pluto a Planet Again or Not?
theweathernetwork.com
ByScott Sutherland Meteorologist, theweathernetwork.com
In 2006, when the International Astronomical Union (IAU) set down an official definition for what a 'planet' is, they came up with three rules:
1) The object must be in orbit around the Sun,
2) The object must be massive enough to be a sphere by its own gravitational force. More specifically, its own gravity should pull it into a shape of hydrostatic equilibrium, and
3) It must have cleared the neighborhood around its orbit.
Everything in the solar system technically orbits around the Sun, of course. Something like the Moon doesn't qualify, though, even though it's massive enough to be roughly spherical and its 'neighborhood' is as clear as Earth's is, because it only goes around the Sun as a consequence of being in orbit around Earth. Same goes for the moons of the other planets. Asteroids and comets don't qualify because they're not big enough to become spherical by their own gravity. Even Ceres (which is roughly spherical) doesn't make the cut, because it's in the asteroid belt, thus its 'neighborhood' isn't clear.
Pluto suffers the same problem as Ceres. It's definitely in orbit around the Sun (or at least the common gravitational focus it shares with Charon is in orbit around the Sun). It is massive enough to be a sphere. It just isn't considered to have cleared its neighborhood. So, not a planet, at least by the IAU rules.
However, while the first two rules are pretty clear and easy to determine, third isn't. According to Prof. Abel Méndez, of the University of Puerto Rico at Arecibo, "there is no standard 'cleared' metric." It seems that due to the very existence of the Kuiper Belt, Pluto loses its status. However, exactly how cleared does the neighborhood have to be? There are millions of near-Earth asteroids flying around us, and there are even some asteroids that are locked into the same orbit as Earth ('Earth trojans'). There are even more asteroids near Mars' orbit, due to its proximity to the asteroid belt. Jupiter has an extremely large collection of asteroids in its orbit, both preceding it (the Greeks) and following behind (the Trojans).
Even discounting these cases, as it is, when you go further out into the solar system, it gets harder and harder for an object to clear its neighborhood. This is simply because it makes fewer orbits around the Sun compared to objects closer to the Sun, and thus it encounters the other objects in its orbit far less often. Consider Earth, going around the Sun once every year, with Pluto orbiting every 247 years. So, whereas Earth has made roughly 4.5 billion trips around the Sun since it formed, Pluto has only made 18 million similar trips (if it formed at roughly the same time).
As Astronomy magazine editor David Eicher said: "At the Pluto-like distance of 40 astronomical units — 40 times farther away from the Sun then we are now — Earth would not clear its orbit of asteroids, and so would Earth then not be classified as a planet?"
Also, since recent evidence has pointed to the fact that there may be two super-Earth-sized objects out beyond Pluto, both of them would be considered 'dwarf planets' as well, despite one potentially being 10 times the mass of Earth and the other being up to 100 times the mass of Earth.
So, when it comes to Pluto, what's the case for making it a planet again? Based on the facts above and Eicher's own thoughts:
1) the definition of what 'cleared the neighborhood around its orbit' is, itself, unclear
2) it seems unjustifiable that an object even larger than the Earth would not be considered a planet, simply because it orbits far out in our solar system
3) an object's intrinsic characteristics should dictate what kind of object it is, not its location.
Indeed, if you take the IAU's definition and attempt to apply it to all objects we know about, the multitude of worlds that we've discovered outside our solar system aren't technically planets, despite being large enough and even if they've cleared their orbit, because they don't orbit around the Sun.
So, perhaps it's time to revise the IAU's definition, not only to reconsider Pluto for planetary status, but also to make the definition applicable to a wider range of objects. Even if they changed the first rule to have 'a star' instead of 'the Sun' and changed the emphasis of the third rule to be that the object is large enough compared to the rest of the objects in its orbit to be capable of clearing its neighborhood (given enough time), it might be a much better set of conditions to measure everything against.
As Astronomy's editors offer up their time and efforts to host a renewed debate about Pluto, what do you think about its status? Should it be a planet again, remain as a dwarf planet, or perhaps something else? Leave your ideas in the comments below.