探尋宇宙黑洞奧秘

　　12月30日CNN聽力：探訪宇宙黑洞秘密 紐約地鐵站吃披薩小老鼠敏捷躥紅收集

　　Germany, Hawaii, and Michigan, get ready to travelon today's "Roll Call".

　　Wiesbaden High School, we're shouting out theWarriors today.

　　Hello to our viewers in Wiesbaden, Germany.

　　From the Hawaiian island of Oahu, say hello to theRams.

　　They're watching from Admiral Arthur W. Radford High School in Honolulu.

　　And in northern Michigan, Harbor Springs is on today's roll.

　　Great to see the Swordsmen of Harbor Light Christian School.

　　You learn in science that black holes formed when stars collapsed and that they have suchincredibly intense gravity that not even light can escape them, at least that's the theory.

　　There is some controversy over whether black holes actually exist.

　　Some scientists, including Stephen Hawking, have said they don't.

　　Others argue they're mathematically impossible.

　　Those who disagree with that say that not only are they real, but that two of them are aboutto collide.

　　Black holes are some of the strangest and most mysterious object in space.

　　Scientists say they have found new clues that two black holes might be merging, aphenomenon some consider the Holy Grail of physics.

　　NASA says two of its space telescopes have found new information about an odd repeating lightsignal coming from the center of a distant galaxy in the Virgo constellation, about 3.5 billionlight years from Earth.

　　Researchers say the new data is the best evidence yet that the light signal is coming from twosuper massive black holes and that the duo is orbiting closer together than any pair detectedso far.

　　Scientists were able to track the changing light patterns over the past 20 years, usingultraviolent data from Hubble and the Galaxy Evolution Explorer.

　　The two black holes are expected to collide and merge in less than a million years, triggering ahuge explosion.

　　Why all the interests in black hole mass up?

　　For the most part, black holes are a huge mystery.

　　Scientists think there are billions of them in the universe.

　　But they can't actually see them.

　　Experts say they can detect gas and other materials being sucked into the black holes.

　　In the final moments before they collide, it's predicted the black holes will cause ripples in thespace and time called gravitational waves.

　　And scientists say those waves could hold clues about the fabric of our universe.

　　The Gettysburg address is one of the most famous speeches in American history.

　　But there's no known photograph of President Lincoln actually giving it.

　　Why?, you ask. Well, it's short.

　　Like ten sentences and 272 words short, like two to the three minutes short.

　　Some historians think that because it's so short, photographers didn't have time to set up theircameras to capture.

　　Now, that's random.

　　All right. Sticking with the Civil War theme, CSS Georgia, CSS standing for Confederate StatesShip, served near the southeast Georgia coast.

　　It never fired a shot in battle.

　　Confederate troops intentionally sunk it when Union forces approached in late 1864.

　　A little more than 100 years later, a dredge ran into the ship's wreckage in the Savannah River.

　　Now, the U.S. Navy is helping recover a giant relic of the American Civil War.

　　We are right now in Savannah, Georgia, to salvage the CSS Georgia.

　　It's an old confederate ironclad.

　　The Georgia has had numerous failed salvage attempts.

　　So, there's no shortage of debris down there, in addition to the Georgia.

　　We'll mobilize here onboard are naval command and support platform moored in the middle ofthe Savannah River.

　　Anytime you're working underwater, it really comes down to feeling your way around, especiallyworking in zero civility.

　　I mean, six inches to a foot is a good day.

　　Right now, we're lucky enough to have the archeologists and underwater sonar device thatcould literally pinpoint us and put us on to any artifact that they're previously discoveredalready.

　　Something we've been saying a lot of is diving into history.

　　You know, we're actually revisiting the Civil War and every single dive.

　　And after every dive, we also have a chance to take a look at some of those things from thatperiod here on deck, and, you know, kind of asking the question, what is the thing?

　　Even though we don't have plans for the Georgia, we know a lot about ships construction justbased on period.

　　And we've also been relying heavily on the previous archeological operations, the things theyfound in map to guide us in our salvage operation.

　　Our divers are outfitted with the helmet, mounted camera light system.

　　So, we can actually see what they're seeing, but a little bit better on the camera top side.

　　We're also showing a variety of sonar technologies to track our divers movements andeffectively guide them through that debris field on the bottom.

　　Just about everywhere we step down there, we're walking on some piece of wreckage.

　　The wall of debris field is very wide.

　　I'd say it's also very dense.

　　There are a good number of artifacts on the bottom, and it's always a new challenge.

　　And really, Georgia, she doesn't want to give up any of her secrets easily.

　　Three things you might see in New York City: pizza, the subway, and rats?

　　They're generally not seen all at once, though, so it's no surprise this video went viral.

　　A ravenous rodent recently recorded running rapidly with a ration of pizza.

　　The slice was larger than the carrier.

　　And though we don't actually get to see him eat his hard won sample of subway sustance, wecan assume he rat-turn for it later on.

　　Guess when you're rat, you got to get to carry it out.

　　Delivery could be a trap.

　　And though the to-go meal made us all stop and stare, even those with unmistakable moso-phobia, rodent have wanted to miss it.

　　Rats all, folks! CNN STUDENT NEWS pizzas together another show tomorrow.

　　It'd be slice to see you all then.

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