This week in science

Webb Telescope reaches operating temperature and more: Understand the world through 7 images


ESA/ATG medialab

A crucial James Webb Space Telescope component reached its frigid operating temperature the week of April 6–13, as astronomers found the largest comet core ever and a laser beamed from deep space.

Here are the biggest science stories of the week, told in 7 stunning images.

NASA, ESA, Zena Levy (STScI)