https://mobile.twitter.com/esa/status/1042038182127325184

https://mobile.twitter.com/esa/status/1041997781815185408

https://mobile.twitter.com/esa/status/1041965066072072192

https://mobile.twitter.com/esa/status/1041920800520110080

There’s a “camera” comet now moving across the sky. Just a bit too dim to see with the unaided eye, Comet 21P / Giacobini-Zinner has developed a long tail that […]