He called it a neutron, and imagined it as a paired proton and electron. There was no evidence for any of these ideas. Chadwick kept the problem in the back of his mind while working on other things.

The new Neutron rocket includes a "hippo" mouth fairing that deploys upper stages by spitting them out from inside. The private space company Rocket Lab is on track to launch the first of its new ...

He called it a neutron, and imagined it as a paired proton and electron. There was no evidence for any of these ideas. Chadwick kept the problem in the back of his mind while working on other things.