所以ballistic的原意其實(shí)是球的行進(jìn)路線嗎恃逻？！好吧……
哦哦哦哦哦苍苞！又學(xué)到新東西了贷洲。
The world’s first ballistic missile was the V-2 rocket, designed by a team of German scientists under the leadership of Wernher von Braun and used by the Nazis during World War II, primarily against England. As the first object to be launched above Earth’s atmosphere, the bullet-shaped, large-finned V-2 (the “V” stands for Vergeltungswaffen, or “vengeance weapon”) inspired an entire generation of spaceship illustrations. After surrendering to the Allied forces, von Braun was brought to the United States, where in 1958 he directed the launch of Explorer 1, the first U.S. satellite. Shortly thereafter, he was transferred to the newly created National Aeronautics and Space Administration. There he developed the Saturn V, the most powerful rocket ever created, making it possible to fulfill the American dream of landing on the Moon.
Errr, OK??? 所以說(shuō)美國(guó)人登月計(jì)劃的總設(shè)計(jì)師，為納粹工作過(guò)围俘？哇哦砸讳，我有點(diǎn)佩服美國(guó)人。這才是任人唯賢吧界牡？
THE MOST EXTREME example of an elongated orbit is the famous case of the hole dug all the way to China. Contrary to the expectations of our geographically challenged fellow citizens, China is not opposite the United States on the globe. A straight path that connects two opposite points on Earth must pass through Earth’s center. What’s opposite the United States? The Indian Ocean. To avoid emerging under two miles of water, we need to learn some geography and dig from Shelby, Montana, through Earth’s center, to the isolated Kerguelen Islands.
Now comes the fun part. Jump in. You now accelerate continuously in a weightless, free-fall state until you reach Earth’s center—where you vaporize in the fierce heat of the iron core. But let’s ignore that complication. You zoom past the center, where the force of gravity is zero, and steadily decelerate until you just reach the other side, at which time you have slowed to zero. But unless a Kerguelian grabs you, you will fall back down the hole and repeat the journey indefinitely. Besides making bungee jumpers jealous, you have executed a genuine orbit, taking about an hour and a half—just like that of the space shuttle.
Yes. This totally makes sense. And indeed very interesting.
Fearing the entire solar system was unstable and would eventually crash its planets into the Sun or fling them into interstellar space, he postulated, as we will see in Section 9, that God might step in every now and then to set things right.
So THAT is all the "Newton went religious" all about.
呃簿寂，后面的也想截下來(lái)的，但是太長(zhǎng)了宿亡。就是說(shuō)銀河系的中心是個(gè)黑洞常遂，無(wú)限接近黑洞卻沒(méi)有被吞噬的恒星會(huì)極大加快速度。然后離銀河系最近的星系會(huì)和銀河系相撞挽荠。嗯克胳。
