galaxy 星系
由數十億顆恆星集合而成，同時一起沿著固定軌道繞著星系核心轉動的龐大天體集合。
A collection of billions of stars that orbit together around a central hub.
gravitational pull 來自萬有引力的拉力
物體受到來自其他物體萬有引力的吸引所產生的拉力。
The force exerted by one body, such as a star, pulling on another, because of its gravity.
gravity 萬有引力
兩物體互相吸引的力，也是讓地球一直沿著軌道繞著太陽轉的吸引力。
The force of two objects pulling on each other; the force that keeps Earth in orbit around the Sun.
hemisphere 半球
球體的一半，通常指地球的北半球或南半球。
Half of a sphere, often refers to the north and south halves of Earth.
infrared 紅外線
能量比紅色光稍微小一點的光線，肉眼看不見，只要不過量照射對人體無害。
A kind of light that has slightly less energy than red light. It is invisible and not harmful to humans.
intergalactic 星系際/星系之間
太空中兩個以上星系之間的區域。
Of, or to do with, the region of space between two or more galaxies.
International Space Station, the (ISS)國際太空站
在地球上空軌道運轉的大型建築，提供世界各國太空人做為生活與研究的太空實驗室。
A vessel that orbits around the Earth, where astronauts from all countries live and work.
interplanetary 行星際/行星之間
太空中兩個以上行星之間的區域。
Of, or to do with, the region of space between planets in a solar system.
interstellar 星際
太空中兩個以上恆星之間的區域。
Of, or to do with, the region of space between stars in a galaxy.
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