A sizeable cloud of gas and dust is headed straight toward the center of our galaxy: directly into the mouth of the supemassive black hole (also known as Sagittarius A*). When it reaches it, we should be in a good position to see some hugely exciting astrophysics.

This cloud, called G2, is travelling at more than 5 million mph, and started off as a blob about 3 times the size of the Earth. Some of my colleagues are working to connect several radio telescopes from around the world together (the "Event Horizon Telescope" project), so that we can get a better look at events like this.