帕克太阳探测器于今年8月发射升空，以调查太阳大气层的外层区域——日冕。

The Parker Solar Probe launched back in August to investigate the outer region of the Sun's atmosphere, the corona.

日冕是太阳大气的最外层，也是最高温的地方。

The corona is the outermost layer of the Sun's atmosphere and is one of the hottest regions.

光球层的亮度阻止了人们看到太阳大气层的外层。

The brightness of the photosphere prevents people from seeing the outer layer of the sun's atmosphere.