[短片] A Ninth Planet Once Again?

An animation explains the case for the presence of a ninth planet-size object deep in the solar system, beyond the orbit of Neptune.

http://www.nytimes.com/video/sci ... net-once-again.html

A new 9th planet for the solar system?

Observations of the orbits of six small objects have led researchers to propose a very large 9th planet--100s of astronomical units (AU) away from the sun. Far enough away that this Neptune-sized planet takes ~15,000 years to complete one orbit.

Read more: http://scim.ag/1Ownvti

https://www.youtube.com/watch?v=42GeoCVaZQg

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