Gas giants are large planets mostly composed of helium and/or hydrogen. Although these planets have dense cores, they don't have hard surfaces. Jupiter and Saturn are the gas giants in our solar ...

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 ...

WASHINGTON, Feb 4 (Reuters) - Jupiter, without a doubt, is the biggest planet in our solar system. But it turns out that it is not quite as large - by ever so small an amount - as scientists had ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to ...