B 选项“By using engines”意为“通过使用引擎”,卫星在轨道上主要依靠地球引力,而不是引擎。C 选项“By the force of gravity”意为“通过地球引力”,这是卫星保持在轨道上的主要原因。D 选项“By the power of the sun”意为“通过太阳的力量”,太阳的力量不是卫星保持轨道的主要因素。
The Moon Distance Calculator shows approximate times for when the Moon is closest to the Earth (perigee) and furthest from the Earth (apogee).
If you want to have life arise in the Universe, a planet (or world, in the case of a habitable moon, for example) might not be absolutely required, but it certainly provides an outstanding environment where life’s emergence is greeted by a slew of friendly conditions. That means that a...
Spacecraft in orbit around planets, however, need to be carefully disposed of. When theCassini mission to Saturn came to an end, it was dramatically plunged into the planet’s atmosphere, or deorbited, so that it would deliberately break up and be destroyed. That ensured there was no chanc...
are quite different. Compared to Earth, a year on Mars lasts almost twice as long – 686.98 Earth days. This is due to the fact that Mars is significantly farther from the Sun and its orbital period (the time it takes to orbit the Sun) is significantly greater than that of Earth’s....
How long might 2020 CD3 stay in the earth’s orbit? A. For 54 years. B. For one mo
With an average orbital speed of 9.69 km/s, it takes Saturn 29.457 Earth years (or10,759 Earth days) to complete a single revolution around the Sun. In other words, a year on Saturn lasts about as long as 29.5 years here on Earth. However, Saturn also takes just over 10 and a half...
Supermoons don't happen every month because the moon's orbit changes orientation as the Earth goes around the sun. So, the long axis of the moon's elliptical path around the Earth points in different directions, meaning that a full (or new) moon won't always happen at apogee or perigee...
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How long does it take the Earth to orbit the Sun? a.) one sidereal day b.) one month c.) one year X d.) one hour 1-2. What is the name given to the path of the Sun as seen from Earth? a.) Equinox b.) Celestial equator c.) Solstice d.) Ecliptic X 1-3. What is the...