When a meteor strikes Earth, it creates an explosion that compresses the rock in a circular region.

当流星撞击地球，引起的爆炸会把一个圆形区域里的岩石压碎。

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It is long known that Earth's orbit around the Sun changes periodically, cyclically affecting the way solar radiation strikes the Earth.

人们早就知道，地球围绕太阳的轨道会周期性地变化，周期性地影响太阳辐射照射地球的方式。

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“You’re moving the largest mother lode imaginable ” said former astronaut Rusty Schweickart cofounder of the B612 Foundation an organization dedicated to protecting Earth from asteroid strikes.

原宇航员Rusty Schweickart说道。 他是B612基金会的共同发起人，该组织致力于保护地球免受小行星的撞击。

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One in every 20 meteorites that strikes Earth is a piece of Vesta.

WSJ: Asteroid Vesta Gets a Close Study

The project collects what it says are Google Earth images of the locations of drone strikes.

CNN: Dronestagram uses social media to highlight drone strikes

Enever surveyed the available material on meteor and asteroid strikes, then published his own calculations and analysis of what such strikes could do, and have done, to the Earth, with cinematically vivid prose and equally terrifying physics.

CNN: Don't count 'doomsday asteroid' out yet