1. In downtown Singapore, there are a lot of new really tall buildings. The problem was that, although Singapore is generally pretty green, there weren’t many parks in the downtown area. So they built a really big new park. Now there are plenty of trees in the park, and people go ...
though that’s just thanks to the coincidence that the sun is about 400 times farther away than the moon and also about 400 times bigger. Another fun coincidence is that the radius of the sun is about twice the distance to the moon. ...
6. Is it possible to live permanently on another planet? 我们有可能在另一个星球上长期居住吗? 7. Why do black holes exist? 为什么存在黑洞? 8. What is the universe made of? 宇宙是由什么构成的? 9. Are we alone in the universe? 我们是宇宙中唯一的生命体吗? 10. What is the origin of...
Scientists always want to know more about the universe.Years ago they knew many things about the moon.They knew how big it was and how far away it was from the earth.But they wanted to know more about it.They thought the best way was to send men to the moon.The moon is about 384...
The Chinese government has been vigorously promoting compulsory education so that every child has the opportunity to receive education. Since the Compulsory Education Law was enforced in 1986, the goal of promoting compulsory education throughout the country has been achieved through unremitting efforts....
How volcanoes shaped our planet — and why we need to be ready for the next big eruptionVolcanologyGeologyGeophysicsSolid Earth sciencesThe world should learn from past disasters and prepare for the effects of future, inevitable volcanic catastrophes, a wide-reaching book teaches us.#The world ...
Because Earth's orbit around the sun is elliptical (oval-shaped), it isn't always the same distance from the sun. An astronomical unit represents a practical average, rather than a precise measurement, of our distance from the sun. Related: How big is Earth? You may like Perihelion: Wha...
How big is Titan vs Mercury? Titan is 5,149.46 kilometers (3,199.73 mi) in diameter,1.06 times that of the planet Mercury, 1.48 that of the Moon, and 0.40 that of Earth. How big is Mercury vs Pluto? The diameter of Mercury is 4,879.4 km across, while Pluto's diameter is 2,360...
Recently, our scientists have begun digging a really (66) deep hole down to the center of the Earth in Xinjiang, hoping to learn what is happening inside the planet. It is said that the hole will be 10 km (67) deep when completed. That means the drill wi
Mars, the fourth planet from the sun, is the second smallest planet in the solar system; only Mercury is smaller. Mars is about half (53 percent) the size of Earth, but because Mars is a desert planet, it has the same amount of dry land as Earth. The simple question of how big ...