# Velocities in space Everything in space is moving ridiculously fast. ## Rotations you are experiencing now - Rotation of the earth - Equator moves very fast - Cosine of the latitude tells you the distance between you and the equator - Axis of the earth doesn't rotate at all - Earth is orbiting the sun - 30km/s - Don't notice it because it's a constant rate. - closer to sun, moving faster (gravity is weaker) - Elliptical orbits - move faster when closer - Sun is orbiting the galaxy - 250 km/s - 8kparsec from centre, about 200 million years to go around - How aren't we colliding with things? - Everything is so far away - when galaxies collide - Nearest star is 200Au away. - The galaxy is moving - Local group is bound to other galaxies - Moving in the order of 1000km/s - Universe is expanding - Limited by the speed of light in what we can see - Space is expanding - In a 10 minute span we've moved 30,000km! # References 1. https://youtu.be/3Cbzms5k3mE?feature=shared # Footnotes