Where can I watch “The Universe” Season 9 Episode 4 online?

This page provides episode info and a legal-only guide. It does not host streams or downloads. Check official platforms and licensed services for availability in your region (US first).

Do I need to watch earlier episodes before “Alien Worlds”?

Watching earlier episodes in season 9 helps you follow the plot and character arcs leading into this episode.

Watch The Universe Season 9 Episode 4 Online

“Alien Worlds” — Watch "The Universe" Season 9 Episode 4 online in HD for free. Check streaming providers, cast, and episode details.

May 9, 2015 Season 9 Episode 4 45 min PG

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The Universe Season 9

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Where can I watch "Alien Worlds" online?

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Season 9 Episode 4 — Aired on May 9, 2015 • runs about 45 minutes.

Notable cast/guest names in this episode include David Ackroyd, Erik Thompson.

This page includes 1 official still(s) (when available) plus legal availability links.

Looking for “watch The Universe Season 9 Episode 4 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

The ancients believed that the universe consisted of countless worlds we could not see, and argued endlessly over the nature of these distant, invisible planets and whether they might be inhabited. Until recently many scientists thought we would never discover the truth, believing that extra-solar planets were simply too far, too small and too dim to detect. But new technologies have suddenly revealed thousands of distant planets, opening up the most exciting period in astronomy in decades. Some believe we're on the verge of answering the ancient question: are we alone in the universe?