Our galaxy, the Milky Way, is part of the universe, which includes millions of other galaxies and their stars and planets. By comparison, the Earth is microscopic. Compared to a person, on the other hand, the Earth is enormous. It has a diameter of 7,926 miles (12,756 kilometers) ...
The Moon that orbits the Earth is known as the Moon because it was the only Moon we knew of and could see for centuries. The Moon is believed to have been created soon after the Earth was born. A planetoid called Theia smashed into the Earth, and the debris was ejected into space. E...
【题目】Watch the whole video again. Discuss the questions. 4.1 What is the Earth compared to? Is the comparison useful in understanding the infiniteness of the universe?2 What methods does the presenter use to enable viewers to understand this piece of knowledge in physics?EXPRESS YOURSELF 表...
As well as moving around the Sun, the Sun and Earth are orbiting around the dense center of our galaxy at some 447,000 miles per hour (200 km/s). Our galaxy, in turn, is moving relative to the other galaxies around us, and so all the mass in the universe is continuously dancing a...
For more, you can review the accompanying lesson called Comparing Elements in the Universe to Those on Earth. These key areas will be considered: Background of the elements in the universe Supernovas and their relationship to elements The most common elements on Earth ...
答案:The Earth is compared to a virus. The comparison is not very useful.解析:根据相似题答案,在描述宇宙无限性时,地球与可观测宇宙的大小关系,类似病毒与太阳系的大小关系,所以地球被比作病毒;又因我们对病毒的微小和太阳系的庞大都难以真切感知,所以这种比较对理解宇宙无限性帮助不大。答案:The presenter ...
“Until a man duplicates a blade of grass, nature can laugh at his so-called scientific knowledge. Remedies from chemicals will never stand in favorable comparison with the products of nature, the living cell of a plant, the final result of the rays of the sun, the mother of all life.”...
The universe How the ancients conceived the world. Earth Connect (an electrical device) with the ground The front metal panels must be soundly earthed World Humankind considered as social beings; human society Turned her back on the world. Earth Drive (a fox) to its underground lair. World Pe...
We know a lot more about Earth, so what we know can be used for comparison with the other planets. What are Earth’s most distinctive features? This famous image of Earth was taken during the Apollo 17 mission to the moon. Can you find a hurricane? A storm spinning in the opposite ...
For comparison, it took 5 million to 6 million years for water to erode the landscape of Arizona to create the Grand Canyon. The celestial object that plowed into the moon likely hit with a speed of more than 34,000 miles per hour (nearly 55,000 kilometers per hour). The impactor crea...