This illustration depicts the Sun-like star TOI-791 and two giant planets that NASA's TESS space telescope discovered in its orbit. These planets, designated TOI-791 b and TOI-791 c, are roughly the size of Jupiter but a tiny fraction of its mass, meaning they have an extraordinarily low density. Credit: NASA/Daniel Rutter Astronomers have identified two of the fluffiest giant planets ever discovered, with densities so low they are actually less dense than cotton candy. The rare pair of "super-