Astronomers Want to Watch Comets Slam Into Distant Planets

If a massive comet struck the Earth, the oceans would boil and the air would catch fire (don't worry, this isn't about to happen ). But to alien astronomers studying our planet from afar, humanity's brutal demise would look like nothing more than a faint flicker of light. If we could detect such impacts on distant worlds, we might learn a lot about their star systems.