Extras
How Scientists Discovered Dark Matter
What kind of clues led to the discovery of Dark Matter and its place in the universe?
How Scientists Discovered Dark Matter
Dark energy is spreading the universe apart—what’s it mean for astronomy in the future?
How the Universe Will End
Physics Is a Never-Ending Puzzle
Physics rarely yields finite answers, but that doesn’t deter scientists.
Physics Is a Never-Ending Puzzle
Astrophysicist Priya Natarajan has loved atlases and maps since she was a little girl.
Profile: Priya Natarajan
What's the Universe Made Of? Preview
Peer into the universe’s deep unknowns to explore the mysteries of dark matter and energy.