What field of astronomy does Phil Plait find the most exciting right now?

When was the first confirmed detection of an exoplanet?

Most of the detected exoplanets are giants, and likely to have very thick atmospheres like ___

In Earth-like atmospheres, which molecules are extremely reactive, and won't last long without being replenished?

In Earth-like atmospheres, what is the easiest way we know to replenish oxygen?

Which infrared space telescope is designed to look for the signature of oxygen on distant worlds?

We now think that most stars in the galaxy have planets. How many stars are in our galaxy?

We see traces of life on Earth going back nearly ___

Life existed on Earth not too long after it cooled enough to have ___

For most of Earth's history the most advanced life was basically ___

For communicating information across space, you don't need a lot of super sophisticated tech to make ___

SETI stands for ___

We've detected exoplanets older than our Earth. How old is our Earth?

The folks at SETI scan the skies at various ___

The SETI scientist Seth Shostak predicts that, if anyone out there is broadcasting, we'll pick up the signal in ___

We now stand on the edge of understanding some our grandest questions, because of ___