Concept
Hydrosphere
All the liquid water on a planet.
The collective water on a planet's surface and atmosphere — most abundantly Earth's oceans, lakes, rivers, groundwater and water vapour.
Overview
The collective water on a planet's surface and atmosphere — most abundantly Earth's oceans, lakes, rivers, groundwater and water vapour.
See also
The Habitable Zone
Where liquid water can exist on a planet's surface.
The Big Bang
How everything began, 13.8 billion years ago.
Black Holes
Regions where gravity stops light itself.
Dark Matter
The invisible mass holding galaxies together.
Dark Energy
The mysterious force accelerating the universe.
Light-Year & Astronomical Distances
Measuring the unimaginable.