A recent string of cyberattacks against the European Space Agency is just the tip of the iceberg, a researcher said, claiming that email credentials of ESA employees are regularly leaked online.
One of the most stubborn issues in cosmology today concerns the Universe's rate of expansion. Scientists know it's expanding, but defining the rate of that expansion is challenging. The rate of expansion is called the Hubble Constant, after American astronomer Edwin Hubble, who discovered that the Universe is expanding in the 1920s.

