奥林匹斯山: 太阳系最大的火山
Olympus Mons: Largest Volcano in the Solar System
Image Credit: ESA, DLR, FU Berlin, Mars Express; Processing & CC BY 2.0 License: Andrea Luck
Explanation: The largest volcano in our Solar System is on Mars. Although three times higher than Earth’s Mount Everest, Olympus Mons will not be difficult for humans to climb because of the volcano’s shallow slopes and Mars’ low gravity. Covering an area greater than the entire Hawaiian volcano chain, the slopes of Olympus Mons typically rise only a few degrees at a time. Olympus Mons is an immense shield volcano, built long ago by fluid lava. A relatively static surface crust allowed it to build up over time. Its last eruption is thought to have been about 25 million years ago. The featured image was taken by the European Space Agency’s robotic Mars Express spacecraft currently orbiting the Red Planet.
Your Sky Surprise: What picture did APOD feature on your birthday? (post 1995)
Tomorrow’s picture: open space
奥林匹斯山: 太阳系最大的火山
影像提供: ESA, DLR, FU Berlin, Mars Express; Processing & CC BY 2.0 License: Andrea Luck
说明: 我们太阳系最大的火山在火星奥林匹斯山虽然比地球的珠穆朗玛峰要高3倍，但由于这座火山的坡度很和缓，而且火星的重力低，因此人类要攀登并不困难。奥林匹斯山覆盖面积大于整个夏威夷火山链，故其边坡的斜度通常只有数度。由于火星拥有相对静态的表壳，所以很久以前泛流的熔岩得以在很长久的期间，缓缓堆积出奥林匹斯山这座庞大的盾状火山。奥林匹斯山最近的一次喷发，咸认落在2,500万年前。这幅主题影像，是由欧洲航天局目前在绕行火星的火星特快车号飞船所拍摄。
您的天空惊喜: APOD在你生日那天拍了什么照片？（1995年后）
明日的图片: open space
