[netcraft]

im pretty sure this isnt true - if any of those things were massive enough to substitute for the gravitational effects that have been observed they would emit infrared radiation at least.

[T0T0R0]

So go ahead and observe this all-too-obvious infrared, that exoplanets must surely emit.

Meanwhile, their gravity is now well known to induce wobble on their parent stars, which are much more luminous, and probably outshines any exoplanet in the infrared.

[GFK_of_xmaspast]

On the other hand, this has already been done: https://en.wikipedia.org/wiki/List_of_directly_imaged_exopla...

[T0T0R0]

  This method works best for 
  young planets *that emit infrared 
  light* and are far from the glare 
  of the star.

In other words, if they are still swirling balls of liquid magma. So, NOT dark matter.

[GFK_of_xmaspast]

You originally claimed that "Exoplanets are dark matter. They do not emit light, so they are dark", which goes against the cited link.

Furthermore, are you aware that you yourself are emitting infrared light right at this moment and are presumably not a swirling ball of liquid magma?

[T0T0R0]

  are you aware that you yourself are emitting 
  infrared light right at this moment [...] ?

WHAAATTT???!!!1one

The hell you say!

Come on, man. You and I both know that exoplanets are a recent discovery (1988 being the earliest verified potential candidate for the real thing), and thus hard to detect in the visible spectrum. No one is looking at them with an ordinary telescope, tuned into the visible spectrum.

Last time I checked, anything not emitting visible light is commonly referred to as "dark." But wait, let me just check with my specialized visible light emission instrument.

Gee, when I turn off this incandescant light bulb, it goes... dark! Hypothesis verified! Is it still hot? Why yes! Yes, it is still hot. But also dark. Weird!

But hey, while we're being pedantic nerds, I'll just take a moment to correct you, regarding your correction of me.

Most of the examples in the impeccably cited link are measured in multiples of Jupiter's mass, which, you know, pretty much means they're certainly gas giants, and damn near brown dwarf classification, lending to their thermal activity.

So, the heat would likely not be owing to lava or magma.

[evanb]

As long as we're being pedantic nerds: dark matter is not "anything not emitting visible light", although such matter is "dark" in common parlance. Dark matter is called dark because it does not interact electromagnetically at all. No direct interaction with x-rays, radio waves, visible light, UV, IR, etc. etc. etc. It may interact indirectly (eg. by gravitationally distorting spacetime).