Wednesday, March 26, 2008

An Actual Planet In The Making?

Planets around other stars are thought to be quite common. We've found well over 200 extra-solar planets (exoplanets) so far, and our planet-hunting technology is really still in its infancy. We've also seen many protoplanetary disks (aka proplyds, aka debris disks, aka circumstellar disks) around young stars - dense areas of dust and gas around a young star, where we expect planets to form in the future. Now, scientists believe they may have found a planet in the process of formation! They can't be sure as of yet, and it might be a brown dwarf instead (a brown dwarf is something that is not massive enough to be a real star, but too massive to be considered a planet). They see a gap in the protoplanetary disk (that marks the orbit of the nascent world, where it has swept up debris in its path), and they see a bright spot within that gap - this might be the object itself, or it could be the light given off by dust as it falls onto the object.

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