App listed under ‘cellular data’ but not installed on phone

I was reviewing which my cellular data usage and I found an app called ‘astronomy’. This app had used some cellular data. I was confused as to how this app ended up here because I have never downloaded this app at all. I searched the App Store (both free & purchased section) and also the available apps on my phone but it’s no where to be found. It’s not even on App Store so how did i get it on my phone. Even if i reset statistics for this cellular data , it’s still present on my cellular data list. Also, I recently bought this phone so I’m a little worried. What’s going on? How can i remove this app? Why is it showing up on my cellular settings page? Please help!!!