Multiplanet system imaged at HR 8799

Sirius_Alpha wrote:Probably on a much smaller and denser scale. I'm not entirely sure about this, so correct me if I'm wrong. The Oort cloud is expected to extend out several tens of thousands of AU. While HR 8799 may have such an Oort cloud, it's probably far too faint to detect, and what we are seeing is the protoplanetary disk that has been scattered outward. Perhaps given sufficient time, the planets will scatter much of what we see further out, adding to HR 8799's Oort cloud and subtracting from the visible disk.