I came across this article http://www.ibtimes.co.uk/scientists-discovers-light-emiting-mysterious-alien-planet-338945. The web link uses "emitting" in an attributive manner which we have all seen many times. For example "light emitting diode." The title, though uses emitting in this way "Scientists discover light emitting from mysterious alien planet." The first sentence of the article uses "emanate": "Scientists have detected light emanating from..." It's almost like the writer couldn't make up their mind which word to use or wanted to add "variety."
I have seen "emanate" used more often, and to me seems correct. I'm not sure why (which is why I'm asking) but it seems to me that grammatically, "emitting" can't be used the way the writer wants to use it. "Emit" is a transitive verb and I have seen it many times used in "X emits Y" constructions. I feel the sentence should be "Scientists discover light being emitted from mysterious alien planet." (A side question is whether the preposition "by" should be used and not "from.")
The question is, "Is the verb "emit" being used correctly? Why or why not?"