"Why The Universe Does Not Add Up" (And How We Can Try To Figure It Out)

"Why The Universe Does Not Add Up" (And How We Can Try To Figure It Out)

For decades, NASA’s Hubble Space Telescope has helped astronomers measure how fast the universe is expanding. However, those measurements have become more precise, scientists have uncovered a cosmic mystery: the universe appears to be expanding at varying rates depending on how we measure it.

Known as the Hubble tension, this discrepancy challenges our understanding of the cosmos and could point toward something missing from our current model of the universe.

In this video, NASA scientists Jennifer Wiseman and Julie McEnery explore how Hubble helped change our understanding of cosmic expansion, the mysterious role of dark energy, and how NASA’s Nancy Grace Roman Space Telescope will help investigate major examples of unanswered questions in cosmology.

Credit: NASA's Goddard Space Flight Center 

Lead Producer: Paul Morris 

Videographers: Rob Andreioli, John Philyaw

NASA Scientists: Jennifer Wiseman, Julie McEnery

Duration: 5 minutes, 30 seconds

Release Date: Oct. 26, 2026

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