radiation （電磁）輻射
像恆星之類的物體以電磁波或其他粒子形式所釋出的光和熱。
Particles or rays of energy, including heat and light, given off by a substance such as a star.
cosmic radiation 宇宙射線
恆星釋出的高能量宇宙射線，通常會致命。
Radiation emitted by stars that is deadly for most living things.
radio wave 無線電波
恆星會釋出的種電磁輻射，肉眼看不見，但是可以用無線電望遠鏡偵測。
A type of radiation emitted by stars that cannot be seen, but can be detected by radio telescopes.
red giant 紅巨星
恆星崩塌爆炸後逐漸冷卻，外緣也會逐漸膨脹、逐漸轉成紅色的大恆星。
A star that is cooling down, making it swell up and glow red.
rocket 火箭
可以裝滿燃料幫太空船脫離地球引力、送進太空的儀器。
A device, full of fuel, that pushes a spacecraft so hard it can escape Earth’s gravitational pull.
rover 漫遊車
設計來在特定天體表面進行探索的機械車輛，通常可以利用遙控來執行任務。
A robotic vehicle designed to travel along the ground, usually operated by remote control.
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