红移现象在物理学和天文学领域，指物体的电磁辐射由于某种原因频率降低的现象，在可见光波段，表现为光谱的谱线朝红端移动了一段距离，即波长变长、频率降低。红移的现象目前多用于天体的移动及规律的预测上。
结合对早期爆炸留下的红移现象的研究，推知宇宙诞生于约137亿年前，误差2亿年。
Combined with studies of the radiation left over from that primordial explosion, they have found that the universe was born 13.7bn years ago, give or take 200m years.
光学性质显示退火处理的薄膜吸收边缘明显的向长波的方向移动，发生红移现象，而且禁带宽度减少了0。
It also showed that the optical absorption edge of the annealed film appeared shifted towards the longer wavelength side and the band gap decreased by 0.
结果表明，银纳米粒子的最大消光位置随所处介电环境折射率的增加呈现明显的红移现象，两者之间的关系大体呈线性。
The calculation result shows that the maximum of the extinction spectrum depends on the refractive index in a linear way.
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