Description: 伽马射线光子是电磁波谱中能量最高的光子，用希腊字母“γ”表示。伽马射线光子的能量一般大于 100 千电子伏，是可见光光子能量的 50,000 多倍，频率约为 3x10¹⁹ 赫兹或更高，波长小于 10 皮米（1 皮米等于 10^-12 米）。

在地球上，伽马射线可由某些放射性核素的原子核在放射性衰变后发出。在天文学中，伽马射线可由最极端的超新星以伽马射线暴的形式发出，也可由活动星系核（如耀变体）以及太阳耀斑发出。

天体源所发出的伽马射线无法到达地球表面。因此，要研究伽马射线天文，就必须将探测器发射到地球大气层之外。

Related Terms:

• 活动星系核
• Electromagnetic Radiation
• Solar Flare
• Ultraviolet
• 伽玛射线暴

Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

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