> ## Content Index
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# The Most Important Satellite You’ve (Probably) Never Heard Of
- URL: https://www.cascadepbs.org/show/pbs-space-time/episode/the-most-important-satellite-youve-probably-never-heard-of-z1nndq/
- Published: 2025-09-10T14:46:04.000Z
- Updated: 2025-12-25T06:30:20.000Z
- Description: One of the most important reasons we go to space is to know our own planet better.
- Author: Cascade PBS Staff
- Tags: PBS Space Time, Season 11, Episode 10, #ZZZ_Episode_66b037e3-1941-410e-966c-c684479611f3, #episode, #ZZZ_Show_ae70f836-13b6-4c9d-b61f-99f7b8bc29eb, #v1.16

One of the most important reasons we go to space is to know our own planet better. Today I'm going to tell you about an orbiting facility that literally watches Earth's biosphere breath and grow and die with incredible resolution. I'll talk about its profound existential and economic importance, and about why it's in danger of being lost.