New Delhi, June 26 -- Astronomers have uncovered a pair of giant planets that are lighter than cotton candy - super-puffs the size of Jupiter.

The featherweight pair - orbiting a star 1,110 light-years away - are the biggest exoplanets found to have less density than cotton candy.

That makes them the lightest known planets of their size, said the University of Oxford's George Dransfield.

"These two planets have densities comparable to a nice blob of shaving foam, fresh from the can," Dransfield said in an email. She and her team reported their findings Wednesday in Monthly Notices of the Royal Astronomical Society.

Dransfield suspects these fluffy, wispy worlds are probably white or blue, depending on whether the skies there are cloud...