Do the stars in the Milky Way spin in a way that aligns with the galactic equator?
TIMOTHY D. BOYLE, TSUKUBA SCIENCE CITY, JAPAN
Most planets in our solar system have spin axes inclined close to 90° to the ecliptic, the plane of Earth's orbit around the Sun. There are exceptions: Uranus rotates on an axis in line with the ecliptic, and Venus' axis tips 177° (because astronomers define a planet's north pole based on its spin direction, and Venus rotates opposite the direction of most planets). But the alignment of other planets is close enough that it can't be considered a coincidence.