Title Text:[Earlier, at the eye doctor] ‘No, for the last time, the numerals on the paper aren’t my prescription, it’s the shape I want you to make with the laser.’
Origin:https://xkcd.com/2718/
https://www.explainxkcd.com/wiki/index.php/2718:_New_Year%27s_Eve_2023
Title Text:It’s difficult to orbit L6 stably due to gravitational perturbation from Akron and Toledo.
Origin:https://xkcd.com/2717/
要穩定的繞行 L6 並不容易，原因是來自於亞克朗市與托雷多市的重力擾動。
https://www.explainxkcd.com/wiki/index.php/2717:_L6_Lagrange_Point
在天体力学中，拉格朗日点是小质量物体在两个大质量轨道天体影响下的平衡点。或者用更简单的术语来说，就是物体可以相对于定义物体静止不动地漂浮在空间中的位置。
有五个传统的拉格朗日点。两个与两个大质量物体（在本例中为地球和太… Read more
Title Text:It’s a long way down.
Origin:https://xkcd.com/2712/
https://www.explainxkcd.com/wiki/index.php/2712:_Gravity
http://xkcd.in/comic?lg=cn&id=2712
在这部互动漫画中，观众驾驶着一艘小型宇宙飞船穿越广阔的太空区域。观众可以在游乐区探索各种天体和行星，其中许多都包含复活节彩蛋，暗示着《如果？2 和以前的 xkcd 漫画。飞行力学在很大程度上（如果不是全部）是牛顿力学，因此该船能够利用行星的引力来改变其轨迹甚至进入轨道。宇宙飞船周围有指示器圆圈，当引力体进入范围时会出现，显示朝向其重心的方向和身体的大小。每当它与引力体碰撞时，飞船周围也会… Read more
Title Text:If you want to bowl a strike, the optimal place is almost certainly inside a bowling alley, although with a little luck any establishment uphill from one could also work.
Origin:https://xkcd.com/2711/
https://www.explainxkcd.com/wiki/index.php/2711:_Optimal_Bowling
Title Text:A hydroelectric dam is also known as a heavy water reactor.
Origin:https://xkcd.com/2710/
https://www.explainxkcd.com/wiki/index.php/2710:_Hydropower_Breakthrough
http://xkcd.in/comic?lg=cn&id=2710
在这部漫画中，Beret Guy宣布他们的水电站大坝已经达到“Q > 1”，据说这意味着它产生的水多于流入其中的水。实际上，这会违反质量守恒定律。在大坝的整个生命周期中，由于蒸发、渗漏和其他损失，通过排水闸的水量将少于集水区沉淀的总水量。为了生产更多的水，必… Read more
Title Text:The Earth is, on average, located in the habitable zone, but at any given time it has a certain probability of being outside it, which is why life exists on Earth but is mortal.
Origin:https://xkcd.com/2709/
https://www.explainxkcd.com/wiki/index.php/2709:_Solar_System_Model
http://xkcd.in/comic?lg=cn&id=2709
这部漫画… Read more
Title Text:If you ever see the 鈥?dagger symbol with no unmatched footnote, it means the writer is saying the phrase while threatening you with a dagger.
Origin:https://xkcd.com/2708/
https://www.explainxkcd.com/wiki/index.php/2708:_Mystery_Asterisk_Destination
Title Text:I adopted a cat that weighs 12 solar masses. Laser pointers love chasing it.
Origin:https://xkcd.com/2707/
https://www.explainxkcd.com/wiki/index.php/2707:_Astronomy_Numbers
http://xkcd.in/comic?lg=cn&id=2707
空间很大，空间中的东西最终也会变得非常大。因此，天文学中的大多数量都具有巨大的尺度。例如，地球的质量是普通人的 10 23倍，太阳是普通人的 10 5倍，而太阳本身的质量比银河系小10 12倍。这同样适用于速度、距离和时间，它们通… Read more
Title Text:Squaring the circle is really easy with some good clamps.
Origin:https://xkcd.com/2706/
https://www.explainxkcd.com/wiki/index.php/2706:_Bendy
注释：
化圆为方是古希腊尺规作图三大难题之一，即：求一正方形，其面积等于一给定圆的面积。由π为超越数可知，该问题仅用直尺和圆规是无法完成的。但若放宽限制，这一问题可以通过特殊的曲线来完成。如西皮阿斯的割圆曲线，阿基米德的螺线等。
http://xkcd.in/comic?lg=cn&id=2706
几何通常用简单的直线表示二维多边形。在漫画中，线条被比作一个物理对象… Read more
Title Text:Spacetime Soccer, known outside the United States as ‘4D Football’ is a now-defunct sport. Infamous for referee decisions hinging on inconsistent definitions of simultaneity, it is also known for the disappearance of many top players during… [more]
Origin:https://xkcd.com/2705/
https://www.explainxkcd.com/wiki/index.php/2705:_Spacetime_Soccer
