About one-fifth of them are home to a gas giant like Jupiter or a still more massive planet.
WSJ: Galaxy Hosts 100 Billion Planets, in New Estimate
On the plus side, the ability to directly detect light from a planet closer to the size of Earth than a Jupiter-sized gas giant is a positive step forward in our ability to learn more about planets that might be habitable.
FORBES: NASA Detects The Light Of A 'Super-Earth'
Professor Roxburgh told BBC News there appeared to be another planet orbiting the same "sun" - a Neptune-sized gas giant.
BBC: Telescope sees smallest exoplanet
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