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Light Years & Astronomical Units (Oct.20)
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片总数: 3 张•内容版本: v4•公开卡包•更新时间: 8/1/2026
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#1
正面 (问题)
What is an astronomical unit(AU) used for?
背面 (解答)
It is used to measure distances within the solar system.
#2
正面 (问题)
What does 1 AU equal to?
背面 (解答)
1 AU= 150 million km
#3
正面 (问题)
What is a light year (LY) used for?
背面 (解答)
It is used to measure distances outside the solar system. The LY is equal to the distance travelled by light in one year. 1 LY= 9460 000 000 000 km 1 LY= 9460 billion km