Scientists Plan to Make 3-D Map of the Milky Way 科学家计划制作银河系的3d地图

Scientists Plan to Make 3-D Map of the Milky Way 科学家计划制作银河系的3d地图 From VOA Learning English, this is Science in the News. Im June Simms. And Im Jim Tedder. Today on the program, we tell about developments in space exploration

英国学生科学读本 第75期:蒲公英(4)

the young plants as they grew would soon choke one another. 随着幼年蒲公英逐渐长大, 它们就会限制彼此的生长空间。 Did you ever look for dandelions on a cold wet day? 你有没有在清冷的雨天看到过蒲公英? It is not

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And every faint smudge of light you are looking at is a galaxy. For Richard Ellis, it's a galactic treasure trove. So much like an archaeologist/, we piece together history by digging into deeper and deeper layers. So a cosmologist like myself, uses

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A new galaxy is formed where, instead of the discs that the original galaxies have, where all the stars are going around more or less on a plane. Instead the stars are going every which way just like the elliptical galaxies that we see. And so we are

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You know, the indications there are a lot of those stars have planets, maybe have them built since planets you know, being like kittens, you know, just dig one, you get a couple. They are probably on the order of the million and million planets out t

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The first stars in our Milky Way were fearsome high-octane stars, burning their hydrogen fuel at tremendous rates, rushing through their life cycle. They like the rockslides. They live fast and die young. They run out of their fuel very quickly and e

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But our time traveling isnt yet over. There is still the question of how the first galaxies kindled the very first stars. We are on a journey visiting the Dark Ages, a time over 12.5 billion years ago. The sight is spectacular. The sky is ablaze with

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Imagine the disc of our galaxy, if you just took a disc of stars and put it there, gravity would tend to make this disc collapse/ into itself and it would immediately just fall together. That is not what we see with the galaxy. Whats actually going o

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The glowing region is the accretion disc, star debris falling inward, would turn round in the maelstrom heated by frictions to such high temperatures that it glows white hot. So at the center of our galaxy, we do have a black hole. We now know that t

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We are traveling upwards away from our solar system, out of the spiral arms of the Milky Way. In front of us, lie vast clusters of stars, satellite groups that orbit the heart of our galaxy. These are globular clusters, over 150 have been discovered.

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Measuring the brightnesses and colors of the stars in the globular cluster, we can figure out how old they are. Here is the remarkable thing: they are very old. Globular clusters, at least the stars in the globular clusters, in many cases, are almost

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One of the puzzles about our galaxy is that we know that it's had stars forming continuously for about the last ten billion years. But at the rate/ it's eating up its gas now, it's forming new stars, it should burn out that gas soon, should run out o

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Like nebulae which spawn stars, it is made of gas and dust. But that's where most similarities end. For Alex Filippenko, it represents an intriguing industrial zone within our galaxy where the elements from which our world is made or manufactured. Wh

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We live amongst 200 billion stars, in the Milky Way galaxy, a vast cosmic city. The earth is located in a quiet neighborhood, in a safe neck of the woods. But what if we could take our planets on a journey through the galaxy? What wonders would be se

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It's really a wonderful time to be an astronomer, especially in studies of Milk Way. Were undergoing something for revolution. In fact, we can take you places. They're really quite remarkable. We are about to embark on an amazing journey. We'll take

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Now, of course, I can't show you a picture of the galaxy on our screen. We can't fly above the galaxy and take a picture of it, and show you. We're stuck in the disc of the galaxy, but we can still image it from the ground, in fact, this image is a p

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We are taking a ride through the Milky Way. First, we are traveling to a place where stars are born. Even at the speed of light, 196,000 miles a second, the journey lasts for 1,500 years. We've arrived at the vast glowing cloud of gas and dust, the g

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Look closer and there is something strange about this gas and dust. There're patches where it appears to glow. These bright glowing clouds are called nebulae. And along with the Orion Nebula, our Milky Way has some spectacular examples, the Eagle Neb

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Like nebulae which spawn stars, it is made of gas and dust. But that's where most similarities end. For Alex Filippenko, it represents an intriguing industrial zone within our galaxy where the elements from which our world is made or manufactured. Wh

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In about four or five billion years, it will grow into a much bigger star, a star called a red giant. And that outer atmosphere of gases will be held so loosely by the sun at that time that the gases will be blown away gently in what I call a cosmic