ScienceCast : 在世界中心的世界

天文学家用NASA的哈勃太空望远镜发现了一个巨大的氢云,从一个叫格利泽436b的星球上蒸发出来的。由于母星的极端辐射,这颗行星的大气层正在蒸发中。 欲了解更多信息,请访问。 点击这里查看更多视频:

LicenseCreative Commons Attribution

More videos by this producer

ScienceCasts: Escape of the Destructive Electrons

Visit for more. Earth is surrounded by electrons that can be disruptive to our technology. NASA is using high-altitude balloons and spacecraft to monitor and understand these particles in the radiation belts surrounding our planet. Click here to see more videos: https://al

NASA ScienceCasts: A Sunset Sky Show

Click here to see more videos: Visit for more. On the evening of March 18 (2018), step outside for a view of the crescent Moon, Venus, and Mercury together above the twilight horizon.

Measuring Distance in the Solar System | NASA Planetary Sciences

Explore how astronomers and scientists use astronomical units to measure distances in the solar system in this video adapted from NASA. The astronomical unit (au) -- equal to the average distance from Earth to the Sun -- is a convenient unit of measure when talking about distances in the solar syste