View Full Version : Carbon Dioxide Detected on Exoplanet HD 189733b

2008-Dec-09, 11:20 PM
The Hubble Space Telescope has detected carbon dioxide on a planet orbiting another star. The star in question is HD 189733 (also known as V452 Vulpeculae, a variable star designation), a binary system over 60 light years away, and the planet is approximately the size of Jupiter (called HD 189733b). The exoplanet is already known [...]

More... (http://www.universetoday.com/2008/12/09/carbon-dioxide-detected-on-exoplanet-hd-189733b/)

2008-Dec-13, 12:48 PM
Don't get me wrong, I'm thrilled that we're able to detect these things at those distances.

But then: Would detecting CO2 on any rocky exo-planet actually mean anything?
Or: Under what circumstances would it mean anything?

Doesn't Venus (for example) also have CO2 in its atmosphere?

On the other hand, if we're able to detect CO2 on an exo-planet, we could probably also detect oxygen, right?
(from all I've read, oxygen would be the really exciting marker...)