NASAさんのインスタグラム写真 - (NASAInstagram)「Reminders from planet Mercury 👇 1. Keep things simple. Mercury doesn't have an atmosphere or any moons! 2. Celebrate often! The planet completes one revolution around the Sun in just 88 Earth days. If you lived on Mercury, you’d celebrate a birthday every three Earth months! 3. Be grateful for the small things. Because Mercury has a slow spin and short year, it takes a long time for the Sun to rise and set there. Mercury only has one sunrise every 180 Earth days! Learn more about planet Mercury at the link in our bio! Image description: Top-down view of Mercury's Caloris basin. This mosaic image is an enhanced-color composite overlain on a monochrome mosaic to clearly define geologic features. The basin is a gold irregular round shape with craters of varying depths colored blue and yellow throughout. The edges around the basin are shades of blue.」4月16日 2時30分