How sad. I remember Jack from the 80's and onward. He followed Hitchhikers Guide to the Galaxy and preceded "sign-off" when TV stations actually signed off the air! I've been a nightowl my entire life ( I think I was born on the wrong side of the world ) and have always had an intense interest in astronomy and greatly apprciated Jack's encouragements to stargazers, backyard astronomers and any lucky soul fortunate enough to be awake when he came on to do his couple of minutes for the sake of the first science, the pure science of astronomy. I hope they can at least name an asterism for Jack. He deserves it.