The researchers claim to have found ten dark gas giants floating at the heart of our Milky Way without any nearby star to illuminate them. Astronomers have long suspected such rogue planets existed, but this is the first evidence, and the Japanese team believe there could be as many out there as there are stars, a finding likely to shock many.
How they came into being is unclear. One theory is that they may be cast-outs, forgotten worlds ejected from infant solar systems by gravitational forces or interplanetary collisions.
Strictly speaking, the objects aren't even planets, as by definition planets orbit a star or the remains of one. But should the researchers have their calculations right, then strange dark orbs which look very much like planets are out there, far far from any shining star.
Neil Bowdler, BBC News
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gas giants
large planets which don't have a solid surface
rogue
unconventional, not normal
came into being
were formed, created
cast-outs
objects that have been thrown away
ejected from
thrown out of
gravitational forces
the natural attraction that pulls objects in space together
interplanetary collisions
crashes between planets
Strictly speaking
Being accurate
the remains of
what is left of
round, ball-shaped objects
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