ABC News kicked off 2015 by choosing Colonel Chris Hadfield as their “Person of the Week”, for the incredible advice he offers in his newest video, “An Astronaut’s Guide to Optimism”, which has already been seen by over half-a-million people. Reminding everyone that our world—while still facing its challenges—is better than ever before, Colonel Hadfield challenges people to resolve to keep changing the world, for the better.

Colonel Hadfield became a worldwide sensation when he harnessed the power of social media as the Commander of the International Space Station, making outer space accessible to millions and infusing a sense of wonder into our collective consciousness not felt since humans first walked on the moon. Called “the most famous astronaut since Neil Armstrong”, Colonel Hadfield continues to bring the marvels of science and space travel to everyone he encounters.

To view Colonel Hadfield’s video in full, click here.