Mysterious 'hot Jupiter' planets can form quickly or slowly, Gaia spacecraft reveals

These massive worlds are vastly different from anything in our solar system.

So-called hot Jupiters are planets that are roughly as massive as Jupiter and orbit very close to their stars,

Now, new data from the European Space Agency's Gaia spacecraft, which is tracking more than a billion stars in the Milky Way,

Researchers used Gaia's measurements of objects' positions and velocities to determine the relative age of stars.

Combining this information with data on the alignment of hot Jupiters to their stars' rotation

Hot Jupiters with orbits misaligned from the equators of their stars are thought to form late relative to those that are aligned,

"One occurs quickly and produces aligned systems, and occurs over longer timescales and produces misaligned systems,"

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