These brightenings are known as light echoes.
这些明亮的部分称作光回声。
Smaller light echoes have been seen around supernovae.
规模较小的光回音可在超新星附近看见。
By resolving the X-ray spectral line from iron, Suzaku's observations were crucial for eliminating the possibility that subatomic particles caused the light echoes.
通过分解铁的X光谱线，Suzaku的观测对排除亚原子粒子产生光回声的可能性至关重要。
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