" The rocks are exposed to very high pressures and high temperatures, but only fleetingly, " McSween says.

“岩石暴露在非常高的压力和高温下，但只是短暂的，”麦克斯温说。

Ultimately, if we could drill deep enough, we'd actually find metamorphic rocks on every planet, says McSween.

最终，如果我们能钻得足够深，我们就能在每个星球上找到变质岩，麦克斯温说。

The surface of Venus, meanwhile, is hot enough to melt lead—hot enough that McSween thinks most of its surface rock should have metamorphosed.

与此同时，金星表面的温度足以熔化铅，麦克斯温认为金星表面的大部分岩石应该已经变质。

Excluding fossils, McSween says, a quartz-rich sandstone is probably one of the most Earth-specific rocks imaginable—creating one would require plate tectonics, erosion, and water.

麦克斯温说，除去化石，富含石英的砂岩可能是我们所能想象到的最具地球特色的岩石之一——要想形成这样的砂岩，需要板块构造、侵蚀和水的作用。

On Earth, there's an efficient way " to get those rocks up to the surface and cycle surface rocks down to be metamorphosed, " McSween says.

在地球上，有一种有效的方法可以“将这些岩石带到地表，并将地表岩石循环下来，使其变质，”麦克斯温说。