What fraction of the twinkling lights you see at night have Earths? — Geoffrey Marcy Copy Share Image
A major puzzle for which nobody has an answer is this: is there some size at which the planets change their nature from water-rich planets like Neptune, to rocky planets like the Earth? We have found two planets that are… — Geoffrey Marcy Copy Share Image
Our galaxy is 10 billion years old. The Earth is only 4.5 billion years old. We are a firefly flicker in the great astrobiology… — Geoffrey Marcy Copy Share Image
What fraction of the twinkling lights you see at night have Earths? — Geoffrey Marcy Copy Share Image
In the next century or two, we humans will have planet-finder telescopes that span our solar system with mirrors strewn from here to Jupiter,… — Geoffrey Marcy Copy Share Image
I'm at a funny crossroads, personally. I really want to turn my attention away from planet-hunting towards Search for Extra-Terrestrial Intelligence (SETI) program at… — Geoffrey Marcy Copy Share Image
A major puzzle for which nobody has an answer is this: is there some size at which the planets change their nature from water-rich… — Geoffrey Marcy Copy Share Image
