Large gaseous exoplanets could be filled with self-destructing dark matter. And now, a team of researchers has proposed using the soon-to-be-launched James Webb Space Telescope to scan distant behemoths in the galaxy for potential heating effects that could arise from the mysterious substance, which outweighs regular matter by almost 6 to 1 in the universe. 

Physicists know dark matter exists because it tugs gravitationally on stars and galaxies. But, so far, the invisible material has foiled every attempt to better understand its properties.