But they say previous observations by other groups suggest that Jupiter-mass planets in such distant orbits are rare.
但是他们还说，其它小组的早些观察显示，像木星这样质量的行星很少以这种距离在轨道上运行。
2
In this case, the formation of Jupiter-mass worlds may only take a few thousand years to form, well before the planet-building materials are ejected from the system.
这种情形下，类木行星的形成就只需要几千年的时间，远在天体物质被星系抛射出去。
3
'Most planetary scientists would not be surprised if the largest undiscovered companion was Neptune-sized or smaller, but a Jupiter-mass object would be a surprise, ' Matese told SPACE.com