<p class="p1">After Pluto lost its planethood we were down to 8 planets. But there’s growing evidence of another world or worlds out beyond the orbit of Pluto. Is Planet 9 out there and how will we find it? Could there even be a Planet 10?</p>

After Pluto lost its planethood we were down to 8 planets. But there’s growing evidence of another world or worlds out beyond the orbit of Pluto. Is Planet 9 out there and how will we find it? Could there even be a Planet 10?

<p>After Pluto lost its planethood we were down to 8 planets. But there’s growing evidence of another world or worlds out beyond the orbit of Pluto. Is Planet 9 out there and how will we find it? Could there even be a Planet 10?</p>

Ep. 615: Planet 9

This is the full live stream audio of the Astronomy Cast episodes. The first half hour is the regular episode, and the second half hour is a Q&A session with questions submitted by live viewers and email.

Science

Astronomy

This is the full live stream audio of the Astronomy Cast episodes. The first half hour is the regular episode, and the second half hour is a Q&amp;A session with questions submitted by live viewers and email.

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Ep. 615: Planet 9

Ep. 615: Planet 9