3 facts
The extreme aridity and unique geological formations in specific areas of the Atacama Desert have led NASA to use them as testing grounds for Mars rovers. These hyper-arid valleys provide an environment analogous to the Red Planet's surface.
Unlike Earth and most other planets, Venus rotates clockwise. Its extremely slow rotation means one Venusian day (243 Earth days) is longer than its orbital period around the Sun (225 Earth days).
PSR J1719-1438 b, a planet orbiting a pulsar, is thought to be a remnant of a star whose outer layers were stripped away. Its extreme density suggests it's largely composed of crystalline carbon, or diamond, making it an incredibly valuable celestial body.