dark matter 暗物質
一種不是原子組成的物質，看不見但是一樣會產生引力，也會受到引力吸引。
A substance, not made of atoms, that is invisible but is known to have a strong gravitational pull.
density 密度
某物質在一特定體積內含有多少物質的量。
The amount of matter that an object contains, relative to its volume.
dwarf planet 矮行星
沿著軌道繞太陽運轉卻比行星體型小一點的天體，可能會有自己的衛星。
An object in space that orbits around the Sun, and may have its own moons, but is smaller than a planet.
eclipse 食/蝕/缺
太空中的天體暫時躲在別的天體的陰影下。
When one object in space is temporarily hidden behind another.
ESA 歐洲太空總署
歐洲太空總署是歐洲致力太空探索的機構。
European Space Agency, an organization dedicated to the exploration of space.
force 力
推或拉而能改變物體形狀或運動狀態的力量
A push or pull that changes the motion or shape of an object.
freefall 自由落體
一種感覺不受力又輕飄飄的體驗，有時又稱為失重。
The experience of falling so fast that it’s not possible to fall any faster. Sometimes known as weightlessness.
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