文章列表

• 1.英语听力：自然百科 穿越银河系的旅行 Through Milky Way—21
• 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 w...
• 2.英语听力：自然百科 穿越银河系的旅行 Through Milky Way—20
• They were once thought to mark the outer limits, but today astronomers believe the Milky Way galaxy is much bigger than what we can see. To understand...
• 3.英语听力：自然百科 穿越银河系的旅行 Through Milky Way—19
• 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...
• 4.英语听力：自然百科 穿越银河系的旅行 Through Milky Way—18
• 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...
• 5.英语听力：自然百科 穿越银河系的旅行 Through Milky Way—17
• 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 gr...
• 6.英语听力：自然百科 穿越银河系的旅行 Through Milky Way—16
• The glowing region is the accretion disc, star debris falling inward, would turn round in the maelstrom heated by frictions to such high temperatures ...
• 7.英语听力：自然百科 穿越银河系的旅行 Through Milky Way—15
• Each tag is whipping around the center of the galaxy, the particular, the most striking thing you will notice is the motion of SO2.So SO2 goes on an i...
• 8.英语听力：自然百科 穿越银河系的旅行 Through Milky Way—14
• Its a stunning location, but its also mysterious. These stars are not just close together. They are on the move at enormous speeds. Going to the heart...
• 9.英语听力：自然百科 穿越银河系的旅行 Through Milky Way—13
• 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 ...
• 10.英语听力：自然百科 穿越银河系的旅行 Through Milky Way—12
• We are at a foundry here, and they are pouring molten iron from all machinery. And they are going to make parts for new machines out of that iron, so ...