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Our expert voices conversation on "How to look for alien life."

We find ourselves in a universe that appears, at first glance, ripe for life. Liquid water, abundant even in our own solar system (though most of it is hiding underneath thick icy crusts), amino acids hitching rides on comets, simple proteins found in young systems, millions upon millions of stars exactly like our sun in just the Milky Way galaxy.

By all appearances we should not be alone, and yet we don't see a single sign of anybody else, anywhere.

The chances of life appearing in the universe are obviously greater than 0 (otherwise I wouldn't be writing this and you wouldn't be reading this), but seem far, far less than 1.

What Earth got right: We can understand why planets like Mars and Venus wound up dead — too small to sustain a protective magnetic field and choking on its own oppressive atmosphere, respectively — even though they had a decent shot. But we don't fully understand the special sauce that makes life possible. So we're playing a numbers game. How many planets are out there? How many have liquid water? How many have a stable star and the right cocktail for life? It's only by obsessive, detailed observations will we crack it.

The other voices in the conversation:

Go deeper

California's largest blaze razes homes as 88 huge wildfires burn in U.S.

Firefighters on the scene as dozens of homes burn during the Dixie Fire in the Indian Falls neighborhood of unincorporated Plumas County, California, on July 24. Photo: Josh Edelson/AFP via Getty Images

Flames from California's biggest wildfire were engulfing homes in the state's north overnight — one of 88 large blazes raging in the U.S.

Driving the news: The Dixie Fire, which erupted July 14 near the origin of the deadly 2018 Camp Fire in Butte County, was tearing through the community of Indian Falls, per AP.

Updated 1 hour ago - Sports

U.S. swim team wins 6 Tokyo Olympics medals, including 1st gold

Chase Kalisz of Team United States celebrates after winning the Men's 400m Individual Medley Final on day two of the Tokyo 2020 Olympic Games at Tokyo Aquatics Centre in Tokyo, Japan. Photo: Al Bello/Getty Images

Swimmer Chase Kalisz has become the first Team United States Olympian to win gold at the Tokyo Games.

The big picture: The Rio 2016 silver medalist's winning time in the men's 400 meters Individual Medley Final was 4 minutes 9.42 seconds. His teammate Jay Litherland took silver, .86 seconds behind him.

Golfer Bryson DeChambeau will miss Olympics after testing positive for COVID

Bryson DeChambeau of the United States on the 18th tee during Day Two of the 149th Open at Royal St George’s Golf Club on July 16 in Sandwich, England. Photo: Andrew Redington/Getty Images

Golfer Bryson DeChambeau has tested positive for COVID-19 and will miss the Tokyo Olympic Games, USA Golf announced late Saturday.

What's happening: "Patrick Reed will replace DeChambeau and is undergoing the requisite testing protocol" Sunday and Monday before his expected departure for Japan, per a USA Golf statement.

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