1.(Celestial Objects) Also called:major planetany of the eight celestial bodies, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, that revolve around the sun in elliptical orbits and are illuminated by light from the sun ...
The planets today shows you where the planets are now as a live display - a free online orrery. In this solar system map you can see the planetary positions from 3000 BCE to 3000 CE, and also see when each planet is in retrograde.
The earth is one of theplanetsin the Galaxy. 地球是银河系中的星球之一. 《简明英汉词典》 Travel through space to otherplanetsinterests many people today. 现在很多人对去宇宙中其它行星旅行感兴趣. 《现代英汉综合大词典》 Someplanetsrun at incredible speed. ...
their satellites, and numerous small bodies, including asteroids, comets, and meteoroids. An estimated 99.85 percent of the mass of our solar system is contained within the Sun, while the planets collectively make up most of the remaining 0.15 percent. The planets, in order of their distance f...
Today, we are thinking about one of the planets in my house. It's the planet we live on. Do you know its name? That's right- it's called Earth. Let's find out about the planet and how we can look after it.This is planet Earth. It's got mountains and forests, rivers and lak...
The four giant planets: Jupiter, Saturn, Uranus, and Neptune.Universe Today. Jupiter Jupiteris the fifth planet from the Sun, the largest planet in our solar system, and one of the brightest objects visible to the naked eye. It is composed mostly of hydrogen and helium with other trace gas...
The Sun, Moon, and brightest planets were visible to the naked eyes of ancient astronomers, and their observations and calculations of the movements of these bodies gave rise to the science of astronomy. Today the amount of information on the motions, properties, and compositions of the planets...
asteroid- any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) celestial body,heavenly body- natural objects visible in the sky KBO,Kuiper belt object- any of many minor planets in the Kuiper belt outside ...
Science and the worldview One evening not long ago I stood in the Nepalese town of Panga talking with a group of its citizens. For two hours or more I had been inquiring about their... Dart,E Francis - 《Physics Today》 被引量: 53发表: 1972年 Effect of Sun and Planet-Bound Dark ...
the terrestrial planets today are nearly void of light gases and ices. The explanation may be that the terrestrial planets were once much larger and richer in these materials but eventually lost them because of these bodies’ relative closeness to the Sun, which meant that their temperatures were...