What is a (exo)planet?

According to the IAU decision of 2006 a planet is a celestial body which:

is in orbit around the Sun,
has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and
has “cleared the neighbourhood” around its orbit.

and an exoplanet is a planet around another star.

So what is this?

http://www.bbc.co.uk/news/science-environment-20309762

Looks likes a planet, definitely not a star. It’s bigger than Jupiter, but not big enough to be a brown dwarf (a brown is technically a star). But it doesn’t go around a star. Instead it seems to wander lost through space. It’s bigger than Jupiter, but not big enough to be a brown dwarf (a brown is technically a star). So what word should use to describe it?

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One comment on “What is a (exo)planet?

  1. I definitely think this is interesting. I would agree with the comment from Brandon on Facebook indicating that this is an example of an exo-planet. I think the last quotation from this article was interesting..

    “If this little object is a planet that has been ejected from its native system, it conjures up the striking image of orphaned worlds, drifting in the emptiness of space,” he said.

    If this is truly the case, I can only stand in awe and marvel at how vast the universe is and how it is constantly changing. Amazing to think, is it, that, perhaps, one day planets from our own solar system could possibly be ejected?

    Like

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