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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?"

  • "What is emitted from the divine, though it be only like the reflection from the fire, still has the divine reality in itself, and one might almost ask what were the fire without glow, the sun without light, or the Creator without the creature?" -- Max Müller – JHCL Oct 16 '15 at 6:15
  • @JHCL that's a cool quote. – michael_timofeev Oct 16 '15 at 7:21
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I agree with you that light cannot emit from something. I think that the difficulty is that "The planet emits light" is not a causative, comparable to "The sun melts ice". The latter can be paraphrased: "The sun causes ice to melt", and it implies that "Ice melts". If "emit" were a causative verb like "melt", "The planet emits light" could be paraphrased: *"The planet causes light to emit", but it can't be paraphrased like this, because *"Light emits" is nonsense.

The authors of the article might not be to blame, because headlines are often composed by others.

  • Ok, thank you. I posted a comment earlier but deleted it. – michael_timofeev Oct 16 '15 at 4:22
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It sounds odd to me as well. As you say, "emit" is generally a transitive verb. That said, the OED does list this intransitive use of "emit" [from] without comment; it has one example from 1886. That example is also from the press, so the writer might not have been using the word very carefully.

(b) intr.

  • 1886 Daily News 16 Sept. 7/2 Summoned..for..permitting..smells to emit from his stable.

A look at Google Ngrams does support your statement that "emanating from" is more common; apparently overwhelmingly so:

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A search of Google Books turns up some other examples of this use of "emitting from":

Thus, the LED schematic symbol has light emitting from, or coming out of, the diode. That's why it's called a light-emitting diode.

(Semiconductors: From Book to Breadboard, by Kevin McGowan)

A somewhat comparable case might be the rare intransitive use of transmit to mean "to be transmitted", which seems confined to specialized legal contexts. The OED gives the following examples:

b. intr. (for refl.) To pass to the heirs.

  • 1913 H. Goudy in Ess. Legal Hist. of Congr. Hist. Stud. 208 Where..a delictal action was not strictly penal..it transmitted both actively and passively.
  • 1913 H. Goudy in Ess. Legal Hist. of Congr. Hist. Stud. 218 In contracts the right of action almost invariably transmitted both to the heirs of the creditor and against the heirs of the debtor.

I would recommend always using "emit" transitively, but I'm not sure I would go so far as to call an intransitive use grammatically incorrect.

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The word "emit" means "send out" or "send away from". The 'e' (or 'ex') prefix (from the Latin 'ex') generally means "out" or "outward" and the suffix 'mit' means "to send" (from the Latin "mitter").

So when we say "the planet emits light", we mean "the planet sends light outward". If we turn it around and say "light emits from the planet", we mean "the light is sent outward from the planet". A phrase like "light sends outward from the planet" seems weird, so it seems like the more correct usage would be "light is emitted from the planet". In the example sentence, "scientists discover light being emitted from the planet" makes more sense.

That said, I've heard phrases like "it emits from" or "it's emitting from" many times over. I've never heard of light "emanating" from something that I can recall, though the usage makes perfect sense. I have heard of other things emanating from something, just not light.

In my head, "emanating" is a more figurative, fancy word. To me, "emitting" has the same meaning except it's just an ordinary word I'd bother to use in everyday speech. Not saying that's the definition, but it is my personal experience.

Of note, I know of at least "issue" which is often used in the sense of "it issues forth from" despite also meaning "to send forth".

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Take a look at these Merriam Webster examples:

  1. The telescope can detect light emitted by distant galaxies.
  2. chimneys emitting thick, black smoke
  3. The brakes emitted a loud squeal.

So, why should be these phrases: "loud squeal emitting brakes" or "a smoke emitting chimney" not correct?

I do agree that "emit" is a transitive verb and am just correcting "They made a documentary to show that exhaust fumes which emit from cars may jeopardize people’s health." To “…exhaust-fumes emitted by cars…”

but do not agree that "a light emitting planet" is ungrammatical a phrase.

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    The questioner is fine with "light-emitting planet" = a planet that is emitting light. The issue is with the phrase "light emitting from a planet" = light that is being emitted from a planet. See this: "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.' " – sumelic Apr 4 '16 at 5:20

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