宛如蓝弹珠的地球

2022年2月6日

Blue Marble Earth
Image Credit: NASA, Apollo 17 Crew

Explanation: Welcome to planet Earth, the third planet from a star named the Sun. The Earth is shaped like a sphere and composed mostly of rock. Over 70 percent of the Earth’s surface is water. The planet has a relatively thin atmosphere composed mostly of nitrogen and oxygen. The featured picture of Earth, dubbed The Blue Marble, was taken from Apollo 17 in 1972 and features Africa and Antarctica. It is thought to be one of the most widely distributed photographs of any kind. Earth has a single large Moon that is about 1/4 of its diameter and, from the planet’s surface, is seen to have almost exactly the same angular size as the Sun. With its abundance of liquid water, Earth supports a large variety of life forms, including potentially intelligent species such as dolphins and humans. Please enjoy your stay on planet Earth.

Tomorrow’s picture: galactic rain

宛如蓝弹珠的地球
影像提供: NASA, Apollo 17 Crew

说明: 欢迎光临地球，它是一颗称为太阳的恒星之第三颗行星。形似圆球的地球，最主要的成分是岩石，而且水体覆盖了超过百分之七十的表面。这颗行星有个相对稀薄、主成分为氮和氧的大气。这幅有蓝弹珠之称、在1972年由阿波罗十七号所拍摄的主题影像，呈现了非洲和南极洲附近的景观。它可能是所有影像中，流传最广的照片之一。地球有一个直径高达地球四分之一的大卫星，而从地球表面看出去，月亮的视张角和太阳几乎相同。因为拥有丰沛的液态水，地球得以维系种类繁多的生命形态，包括可能算是高等智慧生物的海豚和人类。最后，请珍惜你在地球暂住的时光。

明日的图片: galactic rain