NASA announcement Wednesday, 1 pm EST. You can use the forum for time zone conversion: This post was posted 3:55 pm EST. While the announcement doesn't have any details, digging a bit deeper: The livestream website calls the event "Spitzer Exoplanet Science Briefing", and of course we can see what the panel is doing: - Thomas Zurbuchen has a management position at NASA, too unspecific. - Michael Gillon is working on TRAPPIST, searching for exoplanets, especially Earth-like ones, with the transit method. - Sean Carey works on the Spitzer telescope, an infrared telescope. It can find transit planets and map planetary disks around other stars. Microlensing events can also be observed. - Nikole Lewis is an expert in exoplanet atmospheres, especially with measurements in transits. - Sara Seager is another expert in exoplanet atmospheres, measured with transits. Based on that panel, I'm quite sure the announcement will be related to the atmospheric composition of some exoplanet, measured in a transit. Speculation: We had water (multiple times), carbon monoxide, carbon dioxide and methane already. We had hydrogen and helium. We also had sodium and titanium dioxide on very hot planets. A new observation of those gases around more exoplanets wouldn't need a press conference. Clouds were also discovered before. What is missing? - Nitrogen is not in the list, but nitrogen is hard to observe. - Oxygen would be a big sensation, as processes without life that produce oxygen are rare. While it is hard to observe, it will come with some ozone, which can be detected. Ozone has absorption bands in the infrared. - Oxygen plus methane together would be even more spectacular, as the combination would be outside of chemical equilibrium. This blog article predits 7 Earth-sized planets around TRAPPIST-1 - three are known already.