Everyday questions about our planet and orbit, answered with sources from agencies and research institutions.
Earth & SpaceWhy do astronauts float in orbit?Gravity is still strong at the ISS. Astronauts float because the station, crew and everything inside it are all in continuous free fall around Earth.Read the answer →Earth & SpaceWhy is the ocean blue?It is not simply a mirror of the sky. Water absorbs more red light, while blue wavelengths penetrate and scatter back more effectively.Read the answer →Earth & SpaceWhy do earthquakes happen?Tectonic motion loads faults with stress. When friction can no longer hold the rocks in place, they slip suddenly and release seismic waves.Read the answer →