英语听力：自然百科 穿越银河系的旅行 Through Milky Way—27（在线收听） |
But our time traveling isn’t 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 the first stars of the Milky Way, their light piercing the fog, bathing us in a strong ultraviolet energy. These first stars will change the way we see the universe forever. Tom Abel has modeled their lives and their deaths. The beautiful things is that we now have computers and program them with laws of physics, put/ in them / gravity, hydrodynamics, how gases move around some of the chemistry and as we evolve it all together, we gain an intuition of how a star has come about. And in the cases of the very first stars, this is absolutely crucial.
It's cosmic cookery. Tom takes the basic ingredients available during the Dark Ages, hydrogen, helium, dark matter and gravity and sets the computer simmering. From the models, Tom can recreate the lives of the stars.
Here we see one of the first stars in the universe. It’s a hundred times as massive as the sun, a million times as bright/.
The first stars are huge, swollen by the massive amounts of hydrogen gas pulled in by the gravitational force of dark matter.
As you know that all this fuel to burn, you think they could live for a long time. They run through it so quickly that you know after a few million years they are already dead. |
| 原文地址：http://www.tingroom.com/lesson/zrbaike/2011/260181.html |