How Big Is the Universe?一 “看”取信息1.“看”前活动(1)Look at the picture and title on Page 42 of the textbook and predict the theme of the video.(2)Think and write down more words about the universe.(3)Finish the quiz in "Activate and Share".(4)Look at the Activity 2-4 ...
Size comparison between the Earth and the Moon. Our local star, however, is also unimaginably huge. At highway speed, it would take almost two years to drive from one side to the other. Compared toEarth, the Sun is a monster; it’s a giant nuclear fusion reactor that has enough hydr...
For example, astronomers look to quasars to study reionization, a period less than a billion years after the Big Bang when electrically neutral hydrogen atoms became charged and the first generation of stars lit up the universe. “The epoch of reionization is considered the end of ...
Cities forests oceans people everything in the universe is made from matter created in the first seconds of the Big Bang every star, every planet, every atom, every blade of grass, every drop of water. => 城市森林中的海洋人类宇宙中的一切事物都是由宇宙大爆炸中的每一颗星星,每一颗行星,每...
Do you know how big a supermassive black hole is? It's so big… that the fastest moving thing in our universe, light traveling at 670 million mph, would take weeks to cross its shadow. That is the case for the black hole known as TON 618 – a very distant black hole that NASA cal...
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In his book"Pale Blue Dot: A Vision of the Human Future in Space" (Random House, 1994), astronomer and science communicatorCarl Saganonce beautifully summed up how "big" Earth is for humanity. "That's home. That's us," Sagan wrote. "On it, everyone you love, everyone you know, eve...
the reason is that the longer light travels through space, the redder it becomes. For the most distant galaxies you have to look all the way into the infrared part of the spectrum, and only with the launch of James Webb did we have a telescope big and sensitive enough to see so f...
Today, the process for recruiting astronauts is streamlined and efficient. But whenNASAset out to recruit the very first astronauts in 1958, it was entering unknown territory. One of the big problems had to do with defining an astronaut's role. In early job descriptions, astronauts were nothing...
Are you old enough for big binoculars? The size of a pair of binoculars is also something to consider. For example, take the objective size and divide it by the power. The number you come up with is the diameter of each of those little circles you'll be looking through. Those bright ...