A recent Northern Lights display actually triggered the motion sensor on one Anchorage, Alaska, home doorbell cam, leading to this cool footage. The home's resident, who is a climatologist by trade, shared the clip to social media.br » Sign up for our newsletter KnowThis to get the biggest stories of the day delivered straight to your inbox: » Subscribe to NowThis: br For more beautiful moments caught on camera, subscribe to NowThis News.