其中，速度表示星系后退的速度，H0为哈勃常数，也即宇宙膨胀速率的参数，而距离指的是星系与相比较星系之间的距离。
H0 is the Hubble constant, or parameter that indicates the rate at which the universe is expanding; and distance is the galaxy's distance from the one with which it's being compared.
它根据回答的准确度和速度奖励分数，在每次回答后你的分数会和其他玩家相比较，特别是和你自己的社交网络中的朋友们相比较。
Points are awarded for accuracy and speed, and after every question your score gets ranked among other players, especially friends in your own social network.
把这一标准差和两次的平均值相比较，我们就能发现他们很相像，（因为我们知道重力加速度是个常数）。
Comparing the ratio of standard deviation to the average for these two distributions shows that they are similar.
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