Concept
Exoplanets
Worlds orbiting other stars.
First confirmed in 1992. We now know of more than 5,800 exoplanets, ranging from molten lava worlds to potentially habitable Earth-analogues.
See also
Co-orbital Object
A body sharing another's orbit around its star.
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.