Hubble Space Telescope mosaic
This huge Hubble Space Telescope mosaic, spanning a width of 600 light-years, shows a star factory of more the 800,000 stars being born. The stars are embedded inside the Tarantula Nebula. NASA, ESA, and E. Sabbi/STScI

Mysteries of the universe: Expansion and gravity

Spiral galaxies NGC 2207 and IC 2163
Spiral galaxies NGC 2207 and IC 2163 Chandra X-ray Observatory Center

Have you ever wondered what’s beyond the edge of the universe? Or better yet: IS there an edge of the universe? And what does it mean that the universe is expanding? In this episode we ponder some big questions from Brains On listeners about the vastness of space. We also cover what we know and don’t know about gravity.

All that plus a brand new mystery sound, Moment of Um (do we get taller when we jump?) and honor roll!