How the Universe Ends
Heat death, Big Rip or Big Crunch: the possible fates of everything
In the beginning...
Complete this course to earn XP
Lessons
Why the expansion speeds up
Practice: Thin out the matter
Three possible endings
Practice: Which ending?
The equation of state
Practice: Tune dark energy
The Big Freeze
Entropy and the arrow of time
Practice: Count the ways
The last stars
Dead stars and proton decay
Practice: Waiting for a decay
The black hole era
Practice: Timeline of the far future
The Big Rip
Practice: Torn apart in order
The Big Crunch and the Big Bounce
Practice: Read the future
What DESI found
Practice: Measured or not?
Why the far future is uncertain
Course Complete
Up nextRecommended first Launch Lesson
Will the universe last forever?
Explore the three leading theories for the end of the universe. Understand entropy, dark energy, and the cosmological constant through interactive timelines.
