Even when you feel completely still, you're actually hurtling through space at over 2 million kilometers per hour due to a combination of cosmic motions. Earth spins on its axis at about 1,670 km/h, while orbiting the Sun at around 107,000 km/h. Meanwhile, the entire solar system is whirling around the center of the Milky Way galaxy at roughly 828,000 km/h. On top of that, our galaxy itself is...