This IoT device notifies you before an Earth-obliterating supernova

This IoT device notifies you before an Earth-obliterating supernova

Would you like a caution before the sector ends? 

Well, it’s now imaginable. Extraluminal is an Internet of Things (IoT) device that may notify you an hour before the Earth is ready to be destroyed via a supernova. 

What is a supernova?