A newly weighed exoplanet has left astronomers deeply puzzled.
, and the planet's gravity starts to retain a significant atmosphere of hydrogen and helium.
The pieces are attracted, first electrostatically, then gravitationally. The more mass it gains, the faster it grows, until it's massive enough to trigger runaway accretion of hydrogen and helium, the lightest elements in the Universe, resulting in a massive gaseous envelope around a rocky core. Exoplanets that experience a cold start or a hot start should cool at different rates, producing distinct characteristics that we should be able to observe.
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