Garik Israelian Quotes
Spectroscopy can probably answer the question, 'Is there anybody out there?' Are we alone?
If you see, in the spectrum of a planet host star, strange chemical elements, it can be a signal from a civilization which is there.
I have no doubt that Brian May would have had a brilliant career in science had he completed his Ph.D. in 1971.
There are many unidentified bands in the spectra of stars. Wide bands are produced by some complex molecules in the interstellar space.
Let me mention that not all sun-like stars host planets - perhaps about 30% of them are planet-builders. It's not so easy to form a planet!
The one way to discover about aliens is to tune your radio telescope and listen to the signals.