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Available Formats PBS Space Time Secure Scanned : 07/02/2026 Watch HD Download HD
PBS Space Time

PBS Space Time - Season 2026 Episode 4

PBS Space Time 2026 -

Overview:We've known that the universe is expanding since 1929, and that its expansion is accelerating since 1998. The culprit behind the acceleration is unknown, so we live with a stand-in term "dark energy". Our modern cosmological model assumes that dark energy has a constant density--always the same amount of the outward-shoving stuff per volume. But there's recent evidence to the contrary--which may be why our primary efforts to measure the expansion rate of the universe disagree with each other.

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First Air Date: Feb 11, 2015 Last Air date: Mar 05, 2026 Season: 13 Season Episode: 427 Episode Runtime: 26:14 minutes Quality: HD IMDb: 1 / 10 by 1 users Popularity: 2.6765 Language: en

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