关于这张图
In this illustration, NASA's Perseverance rover uses its Planetary Instrument for X-ray Lithochemistry (PIXL) instrument to analyze a rock on the surface of Mars. PIXL uses a focused X-ray beam to analyze the chemistry of features as small as a grain of sand. The tiny but powerful beam causes rocks to fluoresce, or produce a glow. While the glow is invisible to the human eye, it is detectable by the instrument and varies according to the rock's elemental chemistry. PIXL scan the beam across the surface of the rock to produce a postage-stamp-sized map of the rock's chemistry at the end of an o…
