[ml/nj]

"astronomers may at last find a planet that shows signs of life as we know it, in the form of atmospheric gases that betray signs of biological activity."

Really? They say that?

Pray tell, which gasses are these?

ML/NJ

[LibWhacker]

Good question! I'll let NASA answer it for you: https://exoplanets.nasa.gov/the-search-for-life/life-signs/.

It's truly fascinating to take an astronomy course and be exposed to all these "tricks of the trade" for the first time. It's mind boggling how much one can learn by studying a weak little trickle of photons coming in from a distant star. But it shouldn't surprise us; humans are very smart and have been working on these astronomical problems for thousands of years. And it's incredible how much they've figured out!